US3298386A - System for establishing a plurality of fluid pressure levels - Google Patents

System for establishing a plurality of fluid pressure levels Download PDF

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Publication number
US3298386A
US3298386A US375157A US37515764A US3298386A US 3298386 A US3298386 A US 3298386A US 375157 A US375157 A US 375157A US 37515764 A US37515764 A US 37515764A US 3298386 A US3298386 A US 3298386A
Authority
US
United States
Prior art keywords
valve
spool
chamber
conduit
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US375157A
Other languages
English (en)
Inventor
Robert M Douglas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dart Industries Inc
Original Assignee
Rexall Drug and Chemical Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rexall Drug and Chemical Co filed Critical Rexall Drug and Chemical Co
Priority to US375157A priority Critical patent/US3298386A/en
Priority to DE19651500212 priority patent/DE1500212B1/de
Priority to GB25298/65A priority patent/GB1114260A/en
Application granted granted Critical
Publication of US3298386A publication Critical patent/US3298386A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/028—Controlling a pressure difference
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/0402—Control of fluid pressure without auxiliary power with two or more controllers mounted in series
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/0404—Control of fluid pressure without auxiliary power with two or more controllers mounted in parallel
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/10—Control of fluid pressure without auxiliary power the sensing element being a piston or plunger
    • G05D16/101—Control of fluid pressure without auxiliary power the sensing element being a piston or plunger the controller being arranged as a multiple-way valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/57—Control of a differential pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • 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
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2605—Pressure responsive
    • Y10T137/2617—Bypass or relief valve biased open

Definitions

  • This invention relates to a novel system for establishing a plurality of fluid pressure levels and relates more specifically to a novel arrangement of differential pressure regulating means for establishing at least two, but preferably three pressure levels.
  • This invention provides two differential pressure regulators embodying therein a resilient force and a piston, the said piston and resilient force being capable of act-uation by a hydraulic fluid supplied via inlet and outlet ports and conduits associated therewith for the establishment of a plurality of hydraulic fluid pressure levels.
  • the differential pressure regulators are arranged in such a manner, according to this invention, so that a first hydran-lic differential fluid p-ressure level can be established across an orifice in a conduit used for delivering hydraulic fluid at a pressure level to drive an intensifier system, for example, and flow in excess of that required for said first pressure level is by-passed to a second hydraulic fluid pressure level.
  • flow in excess of that required for maintaining the second pressure level is by-passed to a third level and arrangements can be provided for ultimately diverting to the sump any flow ⁇ in excess of that required for maintaining said third pressure level.
  • work can 4be performed by the second and third hydraulic fluid pressure levels by proper diversion thereof to areas where they are needed.
  • Piston orfspool valve with reference to the units in the differential pressure regulating valve are likewise intended to have a similar meaning, while a resilient force or resilient force constant are to be deemed equivalent to a spring force or spring force constant.
  • numerals 1 and 31 represent enclosed cylindrical chambers which are adapted to contain therein a slidable piston or spool valve 2 and 32.
  • the spool valves as indicated slidably contact the surface of t-he chambers and move back and forth ther-ein according to certainv pressures acting thereon which will be indicated hereinafter.
  • spring forces 3 and 33 At one end of each of the valves 1 and 31 is located spring forces 3 and 33. These spring forces are usually of a fixed amount or force constant and abut the v-alve faces 4 and 34.
  • spool spindles 5 and 35 form an integral unit with the other spool valve faces 6 and 36. It will be seen that chambers 7 and 37 are provided between the two spool valve faces for circulation of a hydraulic lluid such as an oil.
  • conduit ports 8 and 9 and 38 and 39 At either end of Vthe cylindrical chambers 1 and 31 is located conduit ports 8 and 9 and 38 and 39 respectively.
  • An inlet port 10 and corresponding inlet port 40 on chambers 1 and A31 are also provided for introduction of hydraulic fluid 4to chambers 7 and 37.
  • Outlet ports 11 and 41 are likewise provided in chambers 1 and 31 respectively fordischarge -or by-pass of hydraulic fluid.
  • conduit 12 is provided and this conduit leads to conduit 13,4as well as conduit 14, check valve 15 an-d thence to conduits 16 and 17.
  • stops 18 and 18a, 19 and 19a, and 42 and 42a and 43 and 43a which function to limit the movement of the slidable spool valves so that they are not opening or closing the wrong port channels.
  • spool valve 2 moves to the right and abuts against stops 19 and 19a at which point inlet port 10 is opened.
  • the spring force of spring 3 forces the spool valve 2 against the stops 18 and 18a to thereby close port 10.
  • the spring and stops in chamber 31 function similarly. It will be noted that the springs 3 and 33 are located at opposite (effective) ends with respect to each other in the two differential pressure regulating valves.
  • the differential pressure regulating valves can be provided with a main conduit 60 for introduction of hydraulic fluid to actuate the spool valves in chambers 1 and 31 and thereby make it possible to establish a series of pressure levels.4 Hydraulic fluid is direc-ted through flow control valve 61 and onto conduit 62 where 4by virtue of pressure regulating valve or chamber 1, the pressure in line 60, Pla, is established relative to the hydraulic reference pressure level P1. In the ⁇ arrangem-ent illustrated in the drawing, fluid in excess of that required for maintaining said P1., pressure level is diver-ted from conduit 60 to conduit 63 and ythence to conduits 64 and 65.
  • conduit 62 can be tapped to provide conduit 66, which serves as a reference pilot pressure for at least one of the valves, as will be explained below.
  • Constrictions 67 and 68 can be provided in conduits 69 and 70 which lead to ports S and 3S respectively. The operation of this novel system for establishing a plurality of pressure levels will now be described.
  • a hydraulic fluid is introduced as illustrated in the drawing through conduit 60, and a given percentage of the volume fiowing therethrough passes through flow control valve 61 to conduit 62 and on to establish a reference P1 pressure level.
  • the flow in excess of that required for maintaining said first hydraulic fluid pressure level P1,L is diverted via conduits 63, 64 and 65.
  • Por-t 10, which is normally kept closed by spool valve 2 will open, thus spilling into chamber 7 due to the fact that the fluid pressure from conduit 64 exerted on face 6 of the spool is greater than that of pressure level P1 and the spring force constant 3 which is exerted on the opposite face of the spool valve 4.
  • valve 31 acts opposite with respect t-o valve 1, that is, the valve is normally open rather than closed and the spring force constant is located at the opposite end with respect to ⁇ that of valve 1.
  • the spool valve 32 will move to the left to close inlet port 40.
  • the pressure level P1 acting through conduit 70 on spool valve face 36 becomes less than the spring force 33 and the Huid.
  • the P3 pressure level can be established by the outlet fiow of valve 31 through port 41 and conduit 41a.
  • a relief valve 4117 can be provided in association with this conduit to establish the P3 uid pressure level.
  • the reference pressure level P1 which can fbe used to drive a piston, for example, is also used in this case as the pilot or reference pressure for actuation of spool valves 2 and 32, while the P12 and P2 are the pressures being controlled.
  • I-t can also 'be seen that in this preferred arrangement of thevalves, the flow in excess of that required to maintain the fluid pressure level P1a is by-passed and is used to establish a second uid pressure level P2 via the valve arrangements herein and flow in excess of that required to maintain said second fluid pressure level P2 is further by-passed via the second valve and used to establish a third fluid pressure'level P3 as described hereinabove and illustrated in the drawing.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Fluid Pressure (AREA)
  • Multiple-Way Valves (AREA)
  • Safety Valves (AREA)
US375157A 1964-06-15 1964-06-15 System for establishing a plurality of fluid pressure levels Expired - Lifetime US3298386A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US375157A US3298386A (en) 1964-06-15 1964-06-15 System for establishing a plurality of fluid pressure levels
DE19651500212 DE1500212B1 (de) 1964-06-15 1965-06-14 Druckwandler zur Ausbildung mehrerer Fluessigkeitsdruckstufen
GB25298/65A GB1114260A (en) 1964-06-15 1965-06-15 A method of establishing an arrangement of valves providing a plurality of fluid pressure levels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US375157A US3298386A (en) 1964-06-15 1964-06-15 System for establishing a plurality of fluid pressure levels

Publications (1)

Publication Number Publication Date
US3298386A true US3298386A (en) 1967-01-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US375157A Expired - Lifetime US3298386A (en) 1964-06-15 1964-06-15 System for establishing a plurality of fluid pressure levels

Country Status (3)

Country Link
US (1) US3298386A (de)
DE (1) DE1500212B1 (de)
GB (1) GB1114260A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4585168A (en) * 1983-04-13 1986-04-29 Woma Apparatebau High pressure liquid installation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4836089A (en) * 1987-10-16 1989-06-06 Allied-Signal Inc. Series spool pressure regulator arrangement for a double-acting hydraulic actuator
DE4404358C2 (de) * 1994-02-11 1998-04-09 Daimler Benz Ag Eingangsdruckgesteuertes Mehrwegeventil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2048550A (en) * 1935-03-29 1936-07-21 Helenberg John Pressure actuated trip valve
US2316944A (en) * 1941-12-22 1943-04-20 Hydraulic Dev Corp Inc Valve
US3129720A (en) * 1961-04-07 1964-04-21 Fawick Corp Flow control valve
US3129645A (en) * 1962-05-02 1964-04-21 Double A Prod Co Electrically modulated fluid valve

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4585168A (en) * 1983-04-13 1986-04-29 Woma Apparatebau High pressure liquid installation

Also Published As

Publication number Publication date
GB1114260A (en) 1968-05-22
DE1500212B1 (de) 1970-04-30

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