US20030155016A1 - Double valve with cross exhaust - Google Patents
Double valve with cross exhaust Download PDFInfo
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- US20030155016A1 US20030155016A1 US10/079,926 US7992602A US2003155016A1 US 20030155016 A1 US20030155016 A1 US 20030155016A1 US 7992602 A US7992602 A US 7992602A US 2003155016 A1 US2003155016 A1 US 2003155016A1
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- Prior art keywords
- fluid passage
- outlet
- passage
- inlet
- valve
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/001—Double valve requiring the use of both hands simultaneously
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/008—Valve failure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
- F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
- F16P3/18—Control arrangements requiring the use of both hands
- F16P3/22—Control arrangements requiring the use of both hands for hydraulic or pneumatic control systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/87169—Supply and exhaust
- Y10T137/87193—Pilot-actuated
- Y10T137/87209—Electric
Definitions
- the present invention relates to control valves and, more particularly, relates to a double valve having a cross exhaust capable of replacing two separate valves.
- Machine tools of various types operate through a valving system, which interacts with a pneumatically controlled clutch and/or brake assembly.
- the control valves that are used to operate these machine tools require the operator to actuate two separate control signal applying contacts essentially simultaneously. This requirement of simultaneous application ensures that the operator will not have his hand near the moving components of the machine tool when an operating cycle is initiated.
- the two-control signal applying contacts can then be connected to the valving system that allows compressed air to be delivered to the machine tool to perform its operating cycle.
- the double valve assembly includes two electromagnetic supply valves that are normally closed. Each of the supply valves is moved to an open position in response to an electrical control signal. The two supply valves are arranged in series with respect to the source of compressed air.
- the double valve assembly also includes two exhaust valves, which are normally open. Each exhaust valve is closed by a respective supply valve when it is opened. It is therefore necessary for the supply valves to be opened simultaneously, otherwise supply air will be exhausted from the system through one of the exhaust valves.
- the opening and closing of the valve units is monitored by sensing air pressures in the respective valve units and then comparing these two pressures. The monitoring and comparing of these two pressures are accomplished by using a single air cylinder that is separated into two chambers by a piston. The pressure in each valve unit is delivered to one of the chambers. Thus, unequal pressures in the valve units will cause movement of the normally static piston, which will then interrupt the electrical signal to one of the valve units.
- This and other external electronic monitoring arrangements are expensive and require that electrical signal processing equipment be designed and utilized.
- a control valve system includes a housing defining a first inlet, a second inlet, a first outlet, a second outlet, and an exhaust to define an intrinsically safe double valve.
- the double control valve system of the present invention further includes a pair of cross exhaust passages that eliminates the need for complicated timing devices.
- FIG. 1 is a cross-sectional view of the control valve system shown in its normal position ready for operation
- FIG. 2 is a cross-sectional view of the control valve system shown in an abnormal position
- FIG. 3 is a cross-sectional view of the control valve system shown in its fully operated position with the outlet being fully pressurized;
- FIGS. 1 - 3 a control valve system in accordance with the present invention, which is designated generally by the reference numeral 10 .
- Control valve system 10 is shown as a fluid control valve.
- control valve system 10 comprises a housing 12 having a first fluid inlet fluid passage 14 , a second fluid inlet fluid passage 16 , a first fluid first outlet fluid passage 18 , a second fluid outlet fluid passage 20 , a fluid exhaust fluid passage 22 , a first valve bore 24 , a second valve bore 26 , a first fluid reservoir 28 , and a second fluid reservoir 30 .
- first valve bore 24 Disposed within first valve bore 24 is a first valve member 32 and disposed within second valve bore 26 is a second valve member 34 .
- Located within first inlet fluid passage 14 in a coaxial relationship with first valve member 32 is a third valve member 36 .
- Located within second inlet fluid passage 16 in a coaxial relationship with second valve member 34 is a fourth valve member 38 .
- a pair of solenoid valves 40 and 42 is attached to housing 12 .
- a plurality of fluid passages interconnect valve bores 24 and 26 with first inlet fluid passage 14 , second inlet fluid passage 16 , first outlet fluid passage 18 , second outlet fluid passage 20 , exhaust fluid passage 22 , first fluid reservoir 28 , second reservoir 30 , third valve member 36 , and fourth valve member 38 .
- a fluid passage 44 extends between first inlet fluid passage 14 and an intermediate chamber 46 formed by first valve bore 24 .
- a fluid passage 48 extends between second inlet fluid passage 16 and an intermediate chamber 50 formed by second valve bore 26 .
- a fluid passage 52 extends between intermediate chamber 46 and first reservoir 28 .
- a restrictor 54 is disposed within fluid passage 52 to limit the amount of fluid flow through fluid passage 52 .
- a fluid passage 56 extends between first reservoir 28 and a lower chamber 58 formed by first valve bore 24 .
- a fluid passage 60 extends between intermediate chamber 50 and second reservoir 30 .
- a restrictor 62 is disposed within fluid passage 60 to limit the amount of fluid flow through fluid passage 60 .
- a fluid passage 64 extends between second reservoir 30 and a lower chamber 66 formed by second valve bore 26 .
- a fluid passage 68 extends between fluid passage 52 and the input to solenoid valve 42 .
- a fluid passage 70 extends between fluid passage 60 and the input to solenoid valve 40 .
- a fluid passage 72 extends between the output of solenoid valve 40 and an upper chamber 74 formed by first valve bore 24 .
- a fluid passage 76 extends between the output of solenoid valve 42 and an upper chamber 78 formed by second valve bore 26 .
- a cross passage 80 extends between the lower portion of intermediate chamber 46 and the upper portion of intermediate chamber 50 .
- a cross passage 82 extends between the lower portion of intermediate chamber 50 and the upper portion of intermediate chamber 46 .
- a fluid passage 84 extends between cross passage 80 and second outlet fluid passage 20 .
- a fluid passage 86 extends between cross passage 82 and first outlet fluid passage 18 .
- First outlet fluid passage 18 is in communication with exhaust fluid passage 22 through a lower port 88 and an upper port 90 .
- second outlet fluid passage 20 is in communication with exhaust fluid passage 22 through a lower port 92 and an upper port 94 .
- a reset fluid passage 96 extends into housing 12 and is in communication with the lower portions of lower chamber 58 and lower chamber 66 by communicating with fluid passage 56 and fluid passage 64 , respectively.
- a pair of check valves 98 and 100 are disposed between reset fluid passage 96 and fluid passage 56 and fluid passage 64 , respectively, to prohibit fluid flow between fluid passage 56 or fluid passage 64 to reset fluid passage 96 , but allow fluid flow from reset fluid passage 96 to one or both fluid passages 56 and 64 .
- a reset solenoid 102 is further provided in communication with a supply inlet fluid passage 104 from second inlet fluid passage 16 and reset fluid passage 96 .
- a first valve body or member 106 is disposed within first valve bore 24 and a second valve body or member 108 is disposed within second valve bore 26 .
- First valve member 106 comprises an upper piston 110 , an intermediate piston 112 , and a lower piston 114 , all of which move together as a single unit.
- Upper piston 110 is disposed within upper chamber 74 and includes a first valve seat 116 that opens and closes upper port 90 located between an intermediate chamber 118 of first valve bore 24 and exhaust fluid passage 22 .
- Upper piston 110 further includes a second valve seat 120 that opens and closes lower port 88 located between first outlet fluid passage 18 and intermediate chamber 118 .
- Intermediate piston 112 is disposed within intermediate chamber 46 and includes an annular fluid passage 122 which fluidly connects fluid passage 44 to fluid passage 52 when intermediate piston 112 is seated against housing 12 .
- Lower piston 114 is located within lower chamber 58 and includes a seal 124 that seals lower chamber 58 from first inlet fluid passage 14 .
- Second valve member 108 comprises an upper piston 126 , an intermediate piston 128 , and a lower piston 130 , all of which move together as a single unit.
- Upper piston 126 is disposed within upper chamber 78 and includes a first valve seat 132 that opens and closes upper port 94 located between an intermediate chamber 134 of second valve bore 26 and exhaust fluid passage 22 .
- Upper piston 126 further includes a second valve seat 136 that opens and closes lower port 92 located between second outlet fluid passage 20 and intermediate chamber 134 .
- Intermediate piston 128 is disposed within intermediate chamber 50 and includes an annular fluid passage 138 , which fluidly connects fluid passage 48 to fluid passage 60 when intermediate piston 128 is seated against housing 12 .
- Lower piston 130 is located within lower chamber 66 and includes a seal 140 that seals lower chamber 66 from second inlet fluid passage 16 .
- Third valve member 36 comprises an inner member 142 slidably disposed in first valve bore 24 , a valve seat 144 surrounding inner member 142 , and a valve spring 146 .
- Inner member 142 includes a shoulder portion 148 , which acts as a contact feature with intermediate piston 112 and a contact feature with valve seat 144 .
- Valve spring 146 biases valve seat 144 into contact with inner member 142 and further biases valve seat 144 against housing 12 to prohibit fluid flow between first inlet fluid passage 14 and intermediate chamber 46 .
- Inner member 142 is further capable of being in driving contact with lower piston 114 .
- Fourth valve member 38 comprises an inner member 150 slidably disposed in second valve bore 26 , a valve seat 152 surrounding inner member 150 , and a valve spring 154 .
- Inner member 150 includes a shoulder portion 156 , which acts as a contact feature with intermediate piston 128 and a contact feature with valve seat 152 .
- Valve spring 154 biases valve seat 152 into contact with inner member 150 and further biases valve seat 152 against housing 12 to prohibit fluid flow between second inlet fluid passage 16 and intermediate chamber 50 .
- Inner member 150 is further capable of being in driving contact with lower piston 130 .
- a first cross exhaust fluid passage 158 extends between first outlet fluid passage 18 and intermediate chamber 134 .
- a second cross exhaust fluid passage 160 extends between second outlet fluid passage 20 and intermediate chamber 118 .
- First cross exhaust fluid passage 158 and second cross exhaust fluid passage 160 permit exhausting of first outlet fluid passage 18 and second outlet fluid passage 20 , respectively, in the event control valve system 10 malfunctions, thus providing an intrinsically safe valve.
- FIG. 1 illustrates control valve system 10 in its deactuated position. Pressurized fluid from first inlet fluid passage 14 biases valve seat 144 against housing 12 , thereby closing communication between first inlet fluid passage 14 and intermediate chamber 46 .
- pressurized fluid from first inlet fluid passage 14 is provided to fluid passage 44 , to fluid passage 52 through annular fluid passage 122 , through restrictor 54 and first reservoir 28 , and into lower chamber 58 to bias first valve member 106 upward to seat intermediate piston 112 against housing 12 .
- Pressurized fluid also flows through fluid passage 52 and through fluid passage 68 to the inlet of solenoid valve 42 .
- pressurized fluid from second inlet fluid passage 16 biases valve seat 152 against housing 12 , thereby closing communication between second inlet fluid passage 16 and intermediate chamber 50 .
- pressurized fluid from second inlet fluid passage 16 is provided to fluid passage 48 , to fluid passage 60 through annular fluid passage 138 , through restrictor 62 and second reservoir 30 , and into lower chamber 66 to bias second valve member 108 upward to seat intermediate piston 128 against housing 12 .
- Pressurized fluid also flows through fluid passage 60 and through fluid passage 68 to the inlet of solenoid valve 40 .
- First outlet fluid passage 18 and second outlet fluid passage 20 are in communication with exhaust fluid passage 22 due to second valve seat 120 and first valve seat 116 being biased upward opening lower port 88 and upper port 94 , respectively, and second valve seat 136 and first valve seat 132 being biased upward opening lower port 92 and upper port 94 , respectively. Furthermore, first outlet fluid passage 18 is in communication with intermediate chamber 134 through first cross exhaust fluid passage 158 and second outlet fluid passage 20 is in communication with intermediate chamber 118 through second cross exhaust fluid passage 160 . Intermediate chamber 46 and intermediate chamber 50 are also open to exhaust fluid passage 22 through cross passages 80 and 82 , respectively, through fluid passages 84 and 86 , respectively.
- first valve member 106 and second valve member 108 bias first valve member 106 and second valve member 108 upward maintaining control valve system 10 in the deactuated position.
- the connection between fluid passage 44 and fluid passage 52 through annular fluid passage 122 and the connection between fluid passage 48 and fluid passage 62 through annular fluid passage 138 maintain fluid pressure within lower chamber 58 and lower chamber 66 and first reservoir 28 and second reservoir 30 .
- FIG. 2 illustrates control valve system 10 in its actuated position.
- solenoid valve 40 and solenoid valve 42 have been substantially simultaneously actuated.
- the actuation of solenoid valve 40 connects fluid passage 70 and to fluid passage 72 .
- Pressurized fluid is directed into upper chamber 74 to move first valve member 106 downward.
- the diameter of upper piston 110 is larger than the diameter of lower piston 114 , thus causing the load that moves first valve member 106 downward.
- the actuation of solenoid valve 42 connects fluid passage 68 and to fluid passage 76 . Pressurized fluid is directed into upper chamber 78 to move second valve member 108 downward.
- upper piston 126 is larger than the diameter of lower piston 130 , thus causing the load that moves second valve member 108 downward.
- intermediate piston 112 contacts and drives downward inner member 142 of third valve member 36 , thereby causing shoulder portion 148 to unseat valve seat 144 .
- second valve member 108 unseats valve seat 152 .
- Pressurized fluid flows from first inlet fluid passage 14 into the lower portion of intermediate chamber 46 , through cross passage 80 to the upper portion of intermediate chamber 50 , and through a gap 162 between second valve member 108 and housing 12 to provide pressurized fluid to second outlet fluid passage 20 .
- Pressurized fluid from first inlet fluid passage 14 also flows through fluid passage 84 to second outlet fluid passage 20 .
- pressurized fluid flows from second inlet fluid passage 16 into the lower portion of intermediate chamber 50 , through cross passage 82 to the upper portion of intermediate chamber 46 , and through a gap 164 between first valve member 106 and housing 12 to provide pressurized fluid to first outlet fluid passage 18 .
- Pressurized fluid from second inlet fluid passage 16 also flows through fluid passage 86 to first outlet fluid passage 18 .
- first valve member 106 and second valve member 108 The movement of first valve member 106 and second valve member 108 downward seats valve seats 116 and 120 and valve seats 132 and 136 against housing 12 to close ports 88 and 90 and ports 92 and 94 to isolate first outlet fluid passage 18 from exhaust fluid passage 22 and second outlet fluid passage 20 from exhaust fluid passage 22 . It should be recognized that this arrangement further seals first cross exhaust fluid passage 158 from venting first outlet fluid passage 18 and second cross exhaust fluid passage 160 from venting second outlet fluid passage 20 .
- the fluid pressure within first reservoir 28 and reservoir 30 will initially be reduced when solenoid valve 40 and solenoid valve 42 are actuated but the fluid pressure will return to the supply pressure of first inlet fluid passage 14 and second inlet fluid passage 16 .
- control valve system 10 may optionally includes a pair of washers or restrictors 166 and 168 .
- inlet washer 166 is disposed within the fluid path of inlet fluid passage 16 .
- Inlet washer 166 includes at least one through orifice that is sized to restrict inlet flow.
- outlet washer 168 is disposed within the fluid path of outlet fluid passage 20 .
- Outlet washer 168 similarly includes at least one through orifice that is sized to restrict outlet flow. More particularly, the through orifices of inlet washer 166 and outlet washer 168 are sized to establish an overlap adjustment or timing setting.
- this overlap adjustment preferably enables the disengagement of a brake member prior to engagement of a clutch member and vice versa to prevent unnecessary wear on the machine. Because of the timing capability of this washer arrangement, it is possible to eliminate the need for a check valve to prevent backflow.
- FIG. 3 illustrates control valve system 10 in an abnormal position.
- Second valve member 108 is located in its upward position while first valve member 106 is located in its lower position.
- Both solenoid valve 40 and solenoid valve 42 are located in their deactuated position.
- Pressurized fluid from second inlet fluid passage 16 is provided to fluid passage 48 , to fluid passage 60 through annular fluid passage 138 , through restrictor 62 and second reservoir 30 , and into lower chamber 66 to bias second valve member 108 upward to seat intermediate piston 128 against housing 12 .
- Pressurized fluid also flows through fluid passage 60 and through fluid passage 68 to the inlet of solenoid valve 40 through fluid passage 70 .
- Second outlet fluid passage 20 is in communication with exhaust fluid passage 22 due to second valve seat 136 and first valve seat 132 being biased upward opening lower port 92 and upper port 94 , respectively.
- First valve member 106 is located in its lower position which opens various fluid passages to first outlet fluid passage 18 , which because second cross exhaust fluid passage 160 , is open to exhaust 22 .
- the upper portion of intermediate chamber 46 is open to exhaust 22 through gap 164 .
- Pressurized fluid from first inlet fluid passage 14 is bled to exhaust 22 through fluid passage 44 and through the upper portion of intermediate chamber 46 through gap 164 , through first cross exhaust fluid passage 158 , through upper port 94 to exhaust fluid passage 22 .
- pressurized fluid from first inlet fluid passage 14 will bleed to exhaust 22 by entering the lower portion of intermediate chamber 46 , flow through cross passage 80 , through fluid passage 84 , through second outlet fluid passage 20 , through upper port 94 and into exhaust fluid passage 22 .
- Pressurized fluid in fluid passage 52 and thus lower chamber 58 is also bled to exhaust through restrictor 54 , which removes the biasing being applied to first valve member 106 .
- a leak path also exists from first inlet fluid passage 14 to the lower portion of intermediate chamber 46 to the upper portion of intermediate chamber 46 via a gap between intermediate piston 112 and the walls of first valve bore 24 . From the upper portion of intermediate chamber 46 , fluid pressure may escape as described above. Yet another leak path exists from the lower portion of intermediate chamber 46 through cross passage 80 , from upper portion to lower portion of intermediate chamber 50 , and through cross passage 82 into upper portion of intermediate chamber 46 . From the upper portion of intermediate chamber 46 , fluid pressure may escape as described above.
- first reservoir 28 fluid pressure in first reservoir 28 is bled to exhaust through restrictor 54 removing the pressurized fluid being supplied to solenoid valve 42 through fluid passage 68 .
- the amount of time for lower chamber 58 and first reservoir 28 to bleed to exhaust will depend upon the size of lower chamber 58 , first reservoir 28 , and restrictor 54 .
- valve seat 144 urges first valve member 106 upwards due to the biasing of valve spring 146 , valve seat 144 pushes against shoulder portion 148 to move first valve member 106 . Because of a lost motion attachment between valve seat 144 and upper piston 110 , when valve seat 144 engages housing 12 , intermediate piston 112 has not yet engaged housing 12 . Additional movement of first valve member 106 is required to seat intermediate piston 112 against housing 12 and connect fluid passage 44 to fluid passage 52 and provide pressurized fluid to first reservoir 28 and lower chamber 58 . Without the seating of intermediate piston 112 to housing 12 , the upper portion of intermediate chamber 46 and thus fluid passages 40 and 52 are open to exhaust 22 through gap 164 , first cross exhaust fluid passage 158 , and upper port 94 . Thus, first reservoir 28 is open to exhaust along with fluid passage 68 and the input to solenoid valve 42 . Lower chamber 58 is also open to exhaust, thus eliminating any biasing load that would urge first valve member 106 upward to seat intermediate piston 112 against housing 12 .
- pressurized fluid is supplied to reset fluid passage 96 .
- Pressurized fluid being supplied to reset fluid passage 96 opens check valve 98 due to the pressure differential and pressurized fluid fills first reservoir 28 and lower chamber 58 .
- Restrictor 54 will limit the amount of fluid bled off to exhaust during the resetting procedure.
- first reservoir 28 and lower chamber 58 are filled with pressurized fluid, the fluid within lower chamber 58 acts against upper piston 110 to move first valve member 106 upward to seat intermediate piston 112 against housing 12 .
- Fluid passage 44 is again in communication with fluid passage 52 through annular fluid passage 122 and control valve system 10 is again positioned in its deactuated position as shown in FIG. 1.
- FIGS. 1 through 3 While the above description of FIGS. 1 through 3 have been described with first valve member 106 being located in its intermediate and locked out position and second valve member 108 being located in its deactuated position, it is to be understood that a similar locked out position of control valve system 10 would occur if first valve member 106 were located in its deactuated condition and second valve member 108 were located in its intermediate and locked out condition.
- the resetting procedure of applying pressurized fluid to reset fluid passage 96 would cause the pressurized fluid to open check valve 100 to fill second reservoir 30 and lower chamber 66 .
- the pressurized fluid in lower chamber 66 would lift second valve member 108 to seat intermediate piston 128 against housing 12 reconnecting fluid passage 48 with fluid passage 60 .
- control valve system 10 is a fully fluid operating valve system that has the capability of sensing an abnormal condition and responding to this abnormal condition by switching to a locked out condition, which then requires an individual to go through a resetting operation before control valve system 10 , will again function.
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Abstract
A control valve system having a housing defining a first inlet, a second inlet, a first outlet, a second outlet, and an exhaust to define an intrinsically safe double valve. The double control valve system of the present invention further includes a pair of cross exhaust passages that eliminates the need for complicated timing devices.
Description
- The present invention relates to control valves and, more particularly, relates to a double valve having a cross exhaust capable of replacing two separate valves.
- Machine tools of various types operate through a valving system, which interacts with a pneumatically controlled clutch and/or brake assembly. For safety reasons, the control valves that are used to operate these machine tools require the operator to actuate two separate control signal applying contacts essentially simultaneously. This requirement of simultaneous application ensures that the operator will not have his hand near the moving components of the machine tool when an operating cycle is initiated. The two-control signal applying contacts can then be connected to the valving system that allows compressed air to be delivered to the machine tool to perform its operating cycle.
- Safety rules and regulations require the valving system to be designed such that if a component in the valving system malfunctions, the valving system will not allow additional movement of the machine tool. In addition, the valving system must ensure that a new operation cycle of the machine tool cannot be initiated after a component of the valving system has become defective.
- Prior art electromagnetic valving systems, which are utilized for the operation of machine tools, meet these safety requirements through the use of a double valve assembly. The double valve assembly includes two electromagnetic supply valves that are normally closed. Each of the supply valves is moved to an open position in response to an electrical control signal. The two supply valves are arranged in series with respect to the source of compressed air.
- The double valve assembly also includes two exhaust valves, which are normally open. Each exhaust valve is closed by a respective supply valve when it is opened. It is therefore necessary for the supply valves to be opened simultaneously, otherwise supply air will be exhausted from the system through one of the exhaust valves. The opening and closing of the valve units is monitored by sensing air pressures in the respective valve units and then comparing these two pressures. The monitoring and comparing of these two pressures are accomplished by using a single air cylinder that is separated into two chambers by a piston. The pressure in each valve unit is delivered to one of the chambers. Thus, unequal pressures in the valve units will cause movement of the normally static piston, which will then interrupt the electrical signal to one of the valve units. This and other external electronic monitoring arrangements are expensive and require that electrical signal processing equipment be designed and utilized.
- The continued development of the valving systems for machine tools has been directed toward more reliable, simpler, and less costly valving systems that both meet and exceed the safety performance requirements in force today as well as those proposed for the future.
- According to the principles of the present invention, a control valve system is provided that includes a housing defining a first inlet, a second inlet, a first outlet, a second outlet, and an exhaust to define an intrinsically safe double valve. The double control valve system of the present invention further includes a pair of cross exhaust passages that eliminates the need for complicated timing devices.
- Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
- The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:
- FIG. 1 is a cross-sectional view of the control valve system shown in its normal position ready for operation;
- FIG. 2 is a cross-sectional view of the control valve system shown in an abnormal position; and
- FIG. 3 is a cross-sectional view of the control valve system shown in its fully operated position with the outlet being fully pressurized;
- The following description of the preferred embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
- Referring now to the drawings in which like reference numerals designate like or corresponding parts throughout the several views, there is shown in FIGS.1-3 a control valve system in accordance with the present invention, which is designated generally by the
reference numeral 10.Control valve system 10 is shown as a fluid control valve. - Referring to FIG. 1,
control valve system 10 comprises ahousing 12 having a first fluidinlet fluid passage 14, a second fluidinlet fluid passage 16, a first fluid firstoutlet fluid passage 18, a second fluidoutlet fluid passage 20, a fluidexhaust fluid passage 22, a first valve bore 24, a second valve bore 26, afirst fluid reservoir 28, and asecond fluid reservoir 30. Disposed withinfirst valve bore 24 is afirst valve member 32 and disposed withinsecond valve bore 26 is asecond valve member 34. Located within firstinlet fluid passage 14 in a coaxial relationship withfirst valve member 32 is athird valve member 36. Located within secondinlet fluid passage 16 in a coaxial relationship withsecond valve member 34 is afourth valve member 38. A pair ofsolenoid valves housing 12. - A plurality of fluid passages interconnect
valve bores inlet fluid passage 14, secondinlet fluid passage 16, firstoutlet fluid passage 18, secondoutlet fluid passage 20,exhaust fluid passage 22,first fluid reservoir 28,second reservoir 30,third valve member 36, andfourth valve member 38. Afluid passage 44 extends between firstinlet fluid passage 14 and anintermediate chamber 46 formed byfirst valve bore 24. Afluid passage 48 extends between secondinlet fluid passage 16 and anintermediate chamber 50 formed by second valve bore 26. - A
fluid passage 52 extends betweenintermediate chamber 46 andfirst reservoir 28. Arestrictor 54 is disposed withinfluid passage 52 to limit the amount of fluid flow throughfluid passage 52. Additionally, afluid passage 56 extends betweenfirst reservoir 28 and alower chamber 58 formed byfirst valve bore 24. Similarly, afluid passage 60 extends betweenintermediate chamber 50 andsecond reservoir 30. Arestrictor 62 is disposed withinfluid passage 60 to limit the amount of fluid flow throughfluid passage 60. Additionally, afluid passage 64 extends betweensecond reservoir 30 and alower chamber 66 formed bysecond valve bore 26. - Furthermore, a
fluid passage 68 extends betweenfluid passage 52 and the input tosolenoid valve 42. Afluid passage 70 extends betweenfluid passage 60 and the input tosolenoid valve 40. Afluid passage 72 extends between the output ofsolenoid valve 40 and anupper chamber 74 formed byfirst valve bore 24. Afluid passage 76 extends between the output ofsolenoid valve 42 and anupper chamber 78 formed bysecond valve bore 26. - A
cross passage 80 extends between the lower portion ofintermediate chamber 46 and the upper portion ofintermediate chamber 50. Across passage 82 extends between the lower portion ofintermediate chamber 50 and the upper portion ofintermediate chamber 46. Afluid passage 84 extends betweencross passage 80 and secondoutlet fluid passage 20. Afluid passage 86 extends betweencross passage 82 and firstoutlet fluid passage 18. - First
outlet fluid passage 18 is in communication withexhaust fluid passage 22 through alower port 88 and anupper port 90. Similarly, secondoutlet fluid passage 20 is in communication withexhaust fluid passage 22 through alower port 92 and anupper port 94. Areset fluid passage 96 extends intohousing 12 and is in communication with the lower portions oflower chamber 58 andlower chamber 66 by communicating withfluid passage 56 andfluid passage 64, respectively. A pair ofcheck valves reset fluid passage 96 andfluid passage 56 andfluid passage 64, respectively, to prohibit fluid flow betweenfluid passage 56 orfluid passage 64 to resetfluid passage 96, but allow fluid flow fromreset fluid passage 96 to one or bothfluid passages reset solenoid 102 is further provided in communication with a supplyinlet fluid passage 104 from secondinlet fluid passage 16 andreset fluid passage 96. - A first valve body or
member 106 is disposed withinfirst valve bore 24 and a second valve body ormember 108 is disposed withinsecond valve bore 26.First valve member 106 comprises anupper piston 110, anintermediate piston 112, and alower piston 114, all of which move together as a single unit.Upper piston 110 is disposed withinupper chamber 74 and includes afirst valve seat 116 that opens and closesupper port 90 located between anintermediate chamber 118 of first valve bore 24 andexhaust fluid passage 22.Upper piston 110 further includes asecond valve seat 120 that opens and closeslower port 88 located between firstoutlet fluid passage 18 andintermediate chamber 118. -
Intermediate piston 112 is disposed withinintermediate chamber 46 and includes anannular fluid passage 122 which fluidly connectsfluid passage 44 tofluid passage 52 whenintermediate piston 112 is seated againsthousing 12. -
Lower piston 114 is located withinlower chamber 58 and includes aseal 124 that sealslower chamber 58 from firstinlet fluid passage 14. -
Second valve member 108 comprises anupper piston 126, anintermediate piston 128, and alower piston 130, all of which move together as a single unit.Upper piston 126 is disposed withinupper chamber 78 and includes afirst valve seat 132 that opens and closesupper port 94 located between anintermediate chamber 134 of second valve bore 26 andexhaust fluid passage 22.Upper piston 126 further includes asecond valve seat 136 that opens and closeslower port 92 located between secondoutlet fluid passage 20 andintermediate chamber 134. -
Intermediate piston 128 is disposed withinintermediate chamber 50 and includes anannular fluid passage 138, which fluidly connectsfluid passage 48 tofluid passage 60 whenintermediate piston 128 is seated againsthousing 12. -
Lower piston 130 is located withinlower chamber 66 and includes aseal 140 that sealslower chamber 66 from secondinlet fluid passage 16. -
Third valve member 36 comprises aninner member 142 slidably disposed in first valve bore 24, avalve seat 144 surroundinginner member 142, and avalve spring 146.Inner member 142 includes ashoulder portion 148, which acts as a contact feature withintermediate piston 112 and a contact feature withvalve seat 144.Valve spring 146biases valve seat 144 into contact withinner member 142 and furtherbiases valve seat 144 againsthousing 12 to prohibit fluid flow between firstinlet fluid passage 14 andintermediate chamber 46.Inner member 142 is further capable of being in driving contact withlower piston 114. -
Fourth valve member 38 comprises aninner member 150 slidably disposed in second valve bore 26, avalve seat 152 surroundinginner member 150, and avalve spring 154.Inner member 150 includes ashoulder portion 156, which acts as a contact feature withintermediate piston 128 and a contact feature withvalve seat 152.Valve spring 154biases valve seat 152 into contact withinner member 150 and furtherbiases valve seat 152 againsthousing 12 to prohibit fluid flow between secondinlet fluid passage 16 andintermediate chamber 50.Inner member 150 is further capable of being in driving contact withlower piston 130. - A first cross
exhaust fluid passage 158 extends between firstoutlet fluid passage 18 andintermediate chamber 134. A second crossexhaust fluid passage 160 extends between secondoutlet fluid passage 20 andintermediate chamber 118. First crossexhaust fluid passage 158 and second crossexhaust fluid passage 160 permit exhausting of firstoutlet fluid passage 18 and secondoutlet fluid passage 20, respectively, in the eventcontrol valve system 10 malfunctions, thus providing an intrinsically safe valve. - FIG. 1 illustrates
control valve system 10 in its deactuated position. Pressurized fluid from firstinlet fluid passage 14biases valve seat 144 againsthousing 12, thereby closing communication between firstinlet fluid passage 14 andintermediate chamber 46. Upon actuation ofreset solenoid 102, pressurized fluid from firstinlet fluid passage 14 is provided tofluid passage 44, tofluid passage 52 throughannular fluid passage 122, throughrestrictor 54 andfirst reservoir 28, and intolower chamber 58 to biasfirst valve member 106 upward to seatintermediate piston 112 againsthousing 12. Pressurized fluid also flows throughfluid passage 52 and throughfluid passage 68 to the inlet ofsolenoid valve 42. - In a similar manner, pressurized fluid from second
inlet fluid passage 16biases valve seat 152 againsthousing 12, thereby closing communication between secondinlet fluid passage 16 andintermediate chamber 50. Furthermore, pressurized fluid from secondinlet fluid passage 16 is provided tofluid passage 48, tofluid passage 60 throughannular fluid passage 138, throughrestrictor 62 andsecond reservoir 30, and intolower chamber 66 to biassecond valve member 108 upward to seatintermediate piston 128 againsthousing 12. Pressurized fluid also flows throughfluid passage 60 and throughfluid passage 68 to the inlet ofsolenoid valve 40. - First
outlet fluid passage 18 and secondoutlet fluid passage 20 are in communication withexhaust fluid passage 22 due tosecond valve seat 120 andfirst valve seat 116 being biased upward openinglower port 88 andupper port 94, respectively, andsecond valve seat 136 andfirst valve seat 132 being biased upward openinglower port 92 andupper port 94, respectively. Furthermore, firstoutlet fluid passage 18 is in communication withintermediate chamber 134 through first crossexhaust fluid passage 158 and secondoutlet fluid passage 20 is in communication withintermediate chamber 118 through second crossexhaust fluid passage 160.Intermediate chamber 46 andintermediate chamber 50 are also open to exhaustfluid passage 22 throughcross passages fluid passages upper piston 110 andupper piston 126 offirst valve member 106 andsecond valve member 108, respectively, biasfirst valve member 106 andsecond valve member 108 upward maintainingcontrol valve system 10 in the deactuated position. The connection betweenfluid passage 44 andfluid passage 52 throughannular fluid passage 122 and the connection betweenfluid passage 48 andfluid passage 62 throughannular fluid passage 138 maintain fluid pressure withinlower chamber 58 andlower chamber 66 andfirst reservoir 28 andsecond reservoir 30. - FIG. 2 illustrates
control valve system 10 in its actuated position. Bothsolenoid valve 40 andsolenoid valve 42 have been substantially simultaneously actuated. The actuation ofsolenoid valve 40 connectsfluid passage 70 and tofluid passage 72. Pressurized fluid is directed intoupper chamber 74 to movefirst valve member 106 downward. The diameter ofupper piston 110 is larger than the diameter oflower piston 114, thus causing the load that movesfirst valve member 106 downward. In a similar manner, the actuation ofsolenoid valve 42 connectsfluid passage 68 and tofluid passage 76. Pressurized fluid is directed intoupper chamber 78 to movesecond valve member 108 downward. The diameter ofupper piston 126 is larger than the diameter oflower piston 130, thus causing the load that movessecond valve member 108 downward. Whenfirst valve member 106 moves downward,intermediate piston 112 contacts and drives downwardinner member 142 ofthird valve member 36, thereby causingshoulder portion 148 to unseatvalve seat 144. Similarly,second valve member 108 unseatsvalve seat 152. - Pressurized fluid flows from first
inlet fluid passage 14 into the lower portion ofintermediate chamber 46, throughcross passage 80 to the upper portion ofintermediate chamber 50, and through agap 162 betweensecond valve member 108 andhousing 12 to provide pressurized fluid to secondoutlet fluid passage 20. Pressurized fluid from firstinlet fluid passage 14 also flows throughfluid passage 84 to secondoutlet fluid passage 20. - In a similar manner, pressurized fluid flows from second
inlet fluid passage 16 into the lower portion ofintermediate chamber 50, throughcross passage 82 to the upper portion ofintermediate chamber 46, and through agap 164 betweenfirst valve member 106 andhousing 12 to provide pressurized fluid to firstoutlet fluid passage 18. Pressurized fluid from secondinlet fluid passage 16 also flows throughfluid passage 86 to firstoutlet fluid passage 18. - The movement of
first valve member 106 andsecond valve member 108 downwardseats valve seats valve seats housing 12 to closeports ports outlet fluid passage 18 fromexhaust fluid passage 22 and secondoutlet fluid passage 20 fromexhaust fluid passage 22. It should be recognized that this arrangement further seals first crossexhaust fluid passage 158 from venting firstoutlet fluid passage 18 and second crossexhaust fluid passage 160 from venting secondoutlet fluid passage 20. The fluid pressure withinfirst reservoir 28 andreservoir 30 will initially be reduced whensolenoid valve 40 andsolenoid valve 42 are actuated but the fluid pressure will return to the supply pressure of firstinlet fluid passage 14 and secondinlet fluid passage 16. - Still referring to FIG. 2,
control valve system 10 may optionally includes a pair of washers orrestrictors inlet washer 166 is disposed within the fluid path ofinlet fluid passage 16.Inlet washer 166 includes at least one through orifice that is sized to restrict inlet flow. Similarly,outlet washer 168 is disposed within the fluid path ofoutlet fluid passage 20.Outlet washer 168 similarly includes at least one through orifice that is sized to restrict outlet flow. More particularly, the through orifices ofinlet washer 166 andoutlet washer 168 are sized to establish an overlap adjustment or timing setting. For example, this overlap adjustment preferably enables the disengagement of a brake member prior to engagement of a clutch member and vice versa to prevent unnecessary wear on the machine. Because of the timing capability of this washer arrangement, it is possible to eliminate the need for a check valve to prevent backflow. - FIG. 3 illustrates
control valve system 10 in an abnormal position.Second valve member 108 is located in its upward position whilefirst valve member 106 is located in its lower position. Bothsolenoid valve 40 andsolenoid valve 42 are located in their deactuated position. Pressurized fluid from secondinlet fluid passage 16 is provided tofluid passage 48, tofluid passage 60 throughannular fluid passage 138, throughrestrictor 62 andsecond reservoir 30, and intolower chamber 66 to biassecond valve member 108 upward to seatintermediate piston 128 againsthousing 12. Pressurized fluid also flows throughfluid passage 60 and throughfluid passage 68 to the inlet ofsolenoid valve 40 throughfluid passage 70. Secondoutlet fluid passage 20 is in communication withexhaust fluid passage 22 due tosecond valve seat 136 andfirst valve seat 132 being biased upward openinglower port 92 andupper port 94, respectively. -
First valve member 106 is located in its lower position which opens various fluid passages to firstoutlet fluid passage 18, which because second crossexhaust fluid passage 160, is open toexhaust 22. The upper portion ofintermediate chamber 46 is open to exhaust 22 throughgap 164. Pressurized fluid from firstinlet fluid passage 14 is bled to exhaust 22 throughfluid passage 44 and through the upper portion ofintermediate chamber 46 throughgap 164, through first crossexhaust fluid passage 158, throughupper port 94 to exhaustfluid passage 22. In addition, pressurized fluid from firstinlet fluid passage 14 will bleed to exhaust 22 by entering the lower portion ofintermediate chamber 46, flow throughcross passage 80, throughfluid passage 84, through secondoutlet fluid passage 20, throughupper port 94 and intoexhaust fluid passage 22. Pressurized fluid influid passage 52 and thuslower chamber 58 is also bled to exhaust throughrestrictor 54, which removes the biasing being applied tofirst valve member 106. A leak path also exists from firstinlet fluid passage 14 to the lower portion ofintermediate chamber 46 to the upper portion ofintermediate chamber 46 via a gap betweenintermediate piston 112 and the walls of first valve bore 24. From the upper portion ofintermediate chamber 46, fluid pressure may escape as described above. Yet another leak path exists from the lower portion ofintermediate chamber 46 throughcross passage 80, from upper portion to lower portion ofintermediate chamber 50, and throughcross passage 82 into upper portion ofintermediate chamber 46. From the upper portion ofintermediate chamber 46, fluid pressure may escape as described above. In addition, fluid pressure infirst reservoir 28 is bled to exhaust throughrestrictor 54 removing the pressurized fluid being supplied tosolenoid valve 42 throughfluid passage 68. The amount of time forlower chamber 58 andfirst reservoir 28 to bleed to exhaust will depend upon the size oflower chamber 58,first reservoir 28, andrestrictor 54. With the release of pressurized air fromupper chamber 74 aboveupper piston 110 and the presence of pressurized air within firstinlet fluid passage 14 acting against the bottom ofvalve seat 144,valve spring 146 will movefirst valve member 106 to an intermediate position wherevalve seat 144 is seated againsthousing 12 butintermediate piston 112 is not seated against housing 12 (not shown). - When
valve seat 144 urgesfirst valve member 106 upwards due to the biasing ofvalve spring 146,valve seat 144 pushes againstshoulder portion 148 to movefirst valve member 106. Because of a lost motion attachment betweenvalve seat 144 andupper piston 110, whenvalve seat 144 engageshousing 12,intermediate piston 112 has not yet engagedhousing 12. Additional movement offirst valve member 106 is required to seatintermediate piston 112 againsthousing 12 and connectfluid passage 44 tofluid passage 52 and provide pressurized fluid tofirst reservoir 28 andlower chamber 58. Without the seating ofintermediate piston 112 tohousing 12, the upper portion ofintermediate chamber 46 and thusfluid passages gap 164, first crossexhaust fluid passage 158, andupper port 94. Thus,first reservoir 28 is open to exhaust along withfluid passage 68 and the input tosolenoid valve 42.Lower chamber 58 is also open to exhaust, thus eliminating any biasing load that would urgefirst valve member 106 upward to seatintermediate piston 112 againsthousing 12. - When it is desired to move
control valve system 10 from its locked out position to its deactuated position shown in FIG. 1, pressurized fluid is supplied to resetfluid passage 96. Pressurized fluid being supplied to resetfluid passage 96 opens checkvalve 98 due to the pressure differential and pressurized fluid fillsfirst reservoir 28 andlower chamber 58.Restrictor 54 will limit the amount of fluid bled off to exhaust during the resetting procedure. Oncefirst reservoir 28 andlower chamber 58 are filled with pressurized fluid, the fluid withinlower chamber 58 acts againstupper piston 110 to movefirst valve member 106 upward to seatintermediate piston 112 againsthousing 12.Fluid passage 44 is again in communication withfluid passage 52 throughannular fluid passage 122 andcontrol valve system 10 is again positioned in its deactuated position as shown in FIG. 1. - While the above description of FIGS. 1 through 3 have been described with
first valve member 106 being located in its intermediate and locked out position andsecond valve member 108 being located in its deactuated position, it is to be understood that a similar locked out position ofcontrol valve system 10 would occur iffirst valve member 106 were located in its deactuated condition andsecond valve member 108 were located in its intermediate and locked out condition. The resetting procedure of applying pressurized fluid to resetfluid passage 96 would cause the pressurized fluid to opencheck valve 100 to fillsecond reservoir 30 andlower chamber 66. The pressurized fluid inlower chamber 66 would liftsecond valve member 108 to seatintermediate piston 128 againsthousing 12 reconnectingfluid passage 48 withfluid passage 60. - Thus,
control valve system 10 is a fully fluid operating valve system that has the capability of sensing an abnormal condition and responding to this abnormal condition by switching to a locked out condition, which then requires an individual to go through a resetting operation beforecontrol valve system 10, will again function. - The description of the invention is merely exemplary in nature and, thus, variations that do not depart from the gist of the invention are intended to be within the scope of the invention. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
Claims (11)
1. A control valve system comprising:
a housing defining a first inlet, a second inlet, a first outlet, a second outlet, and an exhaust;
a first passage extending between said first inlet and said first outlet;
a second passage extending between said second inlet and said second outlet;
a third passage extending between said first outlet and said exhaust;
a fourth passage extending between said second outlet and said exhaust;
a fifth passage extending between said first outlet and said fourth passage;
a sixth passage extending between said second outlet and said third passage;
a first plurality of valves disposed within said first passage and said third passage, each of said first plurality of valves being movable between a deactuated position where said first and third passages are closed, an actuated position where said first and third passages are open, and an intermediate position where said first and third passages are partially open;
a second plurality of valves disposed within said second passage and said fourth passage, each of said second plurality of valves being movable between a deactuated position where said second and fourth passages are open, an actuated position where said second and fourth passages are closed, and an intermediate position where said second and fourth passages are partially open; and
a plurality of reset members selectively engageable with said first plurality of valves, said plurality of reset members operable to move said first plurality of valves to said deactuated position when a pressure is applied to said plurality of reset members.
2. The control valve system according to claim 1 , further comprising:
a first restrictor disposed at said first inlet to limit the amount of fluid flow therethrough.
3. The control valve system according to claim 2 , further comprising:
a second restrictor disposed at said second outlet to limit the amount of fluid flow therethrough, said first restrictor and said second restrictor cooperating to establish a predetermined timing configuration.
4. The control valve system according to claim 1 wherein each of said plurality of reset members comprises a biasing member, said biasing member biasing said corresponding reset member to a disengaged position.
5. A circuit for operating a control valve system comprising:
a first inlet, a second inlet, a first outlet, a second outlet, and an exhaust;
a first passage extending between said first inlet and said first outlet;
a second passage extending between said second inlet and said second outlet;
a third passage extending between said first outlet and said exhaust;
a fourth passage extending between said second outlet and said exhaust;
a fifth passage extending between said first outlet and said fourth passage;
a sixth passage extending between said second outlet and said third passage;
a first main valve moveable between a deactuated position where said first passage is closed, an actuated position where said third and sixth passages are closed, and an intermediate position where said third and sixth passages are partially open;
a second main valve moveable between a deactuated position where said second passage is closed, an actuated position where said fourth and fifth passages are closed, and an intermediate position where said fourth and fifth passages are partially open; and
a plurality of reset members selectively engageable with said first main valve, said plurality of reset members operable to move said first main valve to said deactuated position when a pressure is applied to said plurality of reset members.
6. The circuit for operating a control valve system according to claim 5 , further comprising:
a first restrictor disposed at said first inlet to limit the amount of fluid flow therethrough.
7. The circuit for operating a control valve system according to claim 6 , further comprising:
a second restrictor disposed at said second outlet to limit the amount of fluid flow therethrough, said first restrictor and said second restrictor cooperating to establish a predetermined timing configuration.
8. The circuit for operating a control valve system according to claim 5 wherein each of said plurality of reset members comprises a biasing member, said biasing member biasing said corresponding reset member to a disengaged position.
9. The circuit for operating a control valve system according to claim 5 comprising:
a first pilot valve for operating said first main valve; and
a second pilot valve for operating said second main valve.
10. The circuit for operating a control valve system according to claim 5 wherein said reset member comprises a biasing member, said biasing member biasing said reset member to a disengaged position.
11. The circuit for operating a control valve system according to claim 5 , further comprising:
a return spring biasing said first main valve to said intermediate position and said second main valve to said intermediate position.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/079,926 US6604547B1 (en) | 2002-02-19 | 2002-02-19 | Double valve with cross exhaust |
BRPI0300392-2B1A BR0300392B1 (en) | 2002-02-19 | 2003-02-19 | Control valve system and circuit for operating a control valve system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US10/079,926 US6604547B1 (en) | 2002-02-19 | 2002-02-19 | Double valve with cross exhaust |
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US6604547B1 US6604547B1 (en) | 2003-08-12 |
US20030155016A1 true US20030155016A1 (en) | 2003-08-21 |
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US10/079,926 Expired - Lifetime US6604547B1 (en) | 2002-02-19 | 2002-02-19 | Double valve with cross exhaust |
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US (1) | US6604547B1 (en) |
BR (1) | BR0300392B1 (en) |
Cited By (1)
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JP2020029929A (en) * | 2018-08-24 | 2020-02-27 | アズビルTaco株式会社 | Cross-flow type dual valve and manufacturing method of housing of cross-flow type dual valve |
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US7040716B2 (en) * | 2002-08-29 | 2006-05-09 | Railway Technical Research Institute | Anti-lock brake system for vehicles |
US7114521B2 (en) * | 2003-09-03 | 2006-10-03 | Ross Operating Valve Company | Double valve constructed from unitary single valves |
US6840259B1 (en) * | 2003-09-12 | 2005-01-11 | Ross Operating Valve Company | Dynamically-monitored double valve with retained memory of valve states |
DE102005024334A1 (en) * | 2005-05-27 | 2006-12-07 | Ashland-Südchemie-Kernfest GmbH | Cold box binder system using saturated fatty acid esters |
US7438086B2 (en) * | 2006-02-02 | 2008-10-21 | Ross Controls | Dynamic fluid power monitoring system for separate actuators |
US8028717B2 (en) * | 2007-10-04 | 2011-10-04 | Ross Operating Valve Company | High throughput double valve with reduced outlet pressure during a faulted state |
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---|---|---|---|---|
US5927324A (en) * | 1996-12-16 | 1999-07-27 | Ross Operating Valve Company | Cross flow with crossmirror and lock out capability valve |
US6155293A (en) * | 1996-12-16 | 2000-12-05 | Ross Operating Valve Company | Double valve with anti-tiedown capability |
US6478049B2 (en) * | 1996-12-16 | 2002-11-12 | Ross Operating Valve Company | Double valve with anti-tiedown capability |
-
2002
- 2002-02-19 US US10/079,926 patent/US6604547B1/en not_active Expired - Lifetime
-
2003
- 2003-02-19 BR BRPI0300392-2B1A patent/BR0300392B1/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5927324A (en) * | 1996-12-16 | 1999-07-27 | Ross Operating Valve Company | Cross flow with crossmirror and lock out capability valve |
US6155293A (en) * | 1996-12-16 | 2000-12-05 | Ross Operating Valve Company | Double valve with anti-tiedown capability |
US6478049B2 (en) * | 1996-12-16 | 2002-11-12 | Ross Operating Valve Company | Double valve with anti-tiedown capability |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020029929A (en) * | 2018-08-24 | 2020-02-27 | アズビルTaco株式会社 | Cross-flow type dual valve and manufacturing method of housing of cross-flow type dual valve |
JP7148323B2 (en) | 2018-08-24 | 2022-10-05 | アズビルTaco株式会社 | CROSS-FLOW TYPE DUAL VALVE AND METHOD FOR MANUFACTURING CASING OF CROSS-FLOW TYPE DUAL VALVE |
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BR0300392B1 (en) | 2014-04-22 |
BR0300392A (en) | 2004-08-17 |
US6604547B1 (en) | 2003-08-12 |
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