CA1178862A - Engine air cut-off valve - Google Patents
Engine air cut-off valveInfo
- Publication number
- CA1178862A CA1178862A CA000411184A CA411184A CA1178862A CA 1178862 A CA1178862 A CA 1178862A CA 000411184 A CA000411184 A CA 000411184A CA 411184 A CA411184 A CA 411184A CA 1178862 A CA1178862 A CA 1178862A
- Authority
- CA
- Canada
- Prior art keywords
- stem
- gate
- chamber
- valve
- housing
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/12—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit
- F02D9/14—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit the members being slidable transversely of conduit
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanically-Actuated Valves (AREA)
Abstract
"ENGINE AIR CUT-OFF VALVE"
ABSTRACT OF THE DISCLOSURE
The valve comprises a two-piece housing consisting of a body and a flat cover. The body is milled out to define a working chamber.
A port extends through the body wall to communicate with the chamber;
a second port extends through the cover wall. The two ports are aligned at one side of the chamber, so that the remainder of the chamber provides a storage cavity. A gate valve comprising a stem and gate is wholly contained within the chamber. The base of the stem is pivotally connected on a shaft journalled in the housing, so that the gate may be rotated or swung along an arc from the storage cavity to a blocking position across the ports. Disengagable means are provided to normally lock the gate valve in the stored position. Means are also provided to bias the gate valve to the blocking position when the locking means are disengaged.
The assembly is flat and compact and is particularly adapted to fit in the crowded confines of an engine.
ABSTRACT OF THE DISCLOSURE
The valve comprises a two-piece housing consisting of a body and a flat cover. The body is milled out to define a working chamber.
A port extends through the body wall to communicate with the chamber;
a second port extends through the cover wall. The two ports are aligned at one side of the chamber, so that the remainder of the chamber provides a storage cavity. A gate valve comprising a stem and gate is wholly contained within the chamber. The base of the stem is pivotally connected on a shaft journalled in the housing, so that the gate may be rotated or swung along an arc from the storage cavity to a blocking position across the ports. Disengagable means are provided to normally lock the gate valve in the stored position. Means are also provided to bias the gate valve to the blocking position when the locking means are disengaged.
The assembly is flat and compact and is particularly adapted to fit in the crowded confines of an engine.
Description
117~386Z
2 1. Field of the Invention
3 This invention relates to an air cut-off valve which finds
4 application as a safety device for controlling the air intake of an engine.
2. Prior Art 6 An air cut-off valve is commonly employed to close the air 7 intake line extending between the turbocharger and air intake manifold 8 of a diesel or gas-fuelled engine. The valve is used to withhold air 9 supply from the engine, in the event that it is sensed that hydrocarbons are entrained in the air. These valves are particularly needed, for 11 example, in connection with the engines of a drilling rig, where there 12 is a significant possibility that gas will escape from the well and cause 13 the engines to continue running, even though the fuel supply has been 14 closed off. The continued operation of the engines carries a high risk of causing the escaping gas to ignite.
16 The cut-off valve heretofore most widely used in this service 17 in North America is disclosed in Canadian Patent 587,457, issued to 18 Oakes. This valve is described in some detail below because the present 19 invention uses some of its concepts, but incorporates modifications with a view to overcoming some of its shortcomings.
21 The Oakes valve comprises a hollow, box-like, sectional 22 housing having a greater length than width. This housing is formed 23 using two hollowed-out halves or sections which are bolted together. An 24 air inlet port extends through the upper end of the transverse upstream wall of one such section and an outlet port extends through the upper ` 26 end of the downstream wall of the other section. The ports are 27 linearly aligned. In use, the valve is inserted in the air line so 28 that the ports and the chamber internal of the housing form part of ., 29 the air flow path. The long housing extends well below the air line, for a purpose to be explained.
117886;:
1 A valve member, comprisiny a stem and a gate carried thereby, 2 is arranged to reciprocate longitudinally within the chamber. This valve 3 member is movable between stored and operative positions. In the stored 4 position, the gate is disposed in a storage cavity defined by the lower end of the chamber, out of the air flow pathi the stem extends out the bottom 6 Of the housing. In the operative position, the gate is disposed across 7 the ports, seals against the housing, and effectively blocks the air flow 8 path.
g A spring is provided to bias the stem and its attached gate from the stored position to the operative position. This spring is positioned 11 around and along the stem and extends between the bottom wall of the housing 12 and a shoulder on the val~e member. When the valve member is locked by 13 suitable locking means in the stored position, the spring is compressed.
14 When the locking means is released, the spring expands and biases the valve member to the operative or blocking position.
16 The aforementioned releasable locking means comprises a 17 lock-out cylinder which has a spring-loaded shaft that engages a recess 18 in the valve stem, to lock the stem in the stored position.
19 In summary, the Oakes valve involves in concept the following features:
21 (1) a gate positioned in a sealed hollow, in-line housing, 22 ~ which gate is movable between a stored position, in 23 which it is locked in a storage cavity formed by the 24 housing out of the air flow path, and an operative position, in which it blocks and seals the air flow 26 path; and 117~862 l (2) a stem which carries the gate and biases it between 2 the positions, sa;d stem cooperating with mover means 3 and locking means to provide the motion needed at the 4 appropriate time.
The present invention also incorporates the aforementioned 6 features. However, in applicant's view, the Oakes valve, while successful, 8 has some shortcomings. The present invention involves significant structural and conceptual changes which have alleviated or done away 9 with these problems.
One such problem associated with the Oakes valve is its 11 size. It has a thickness of about 2-l/2" and a downwardly extending length 12 of about 17", measured from the centreline of the air line. Since there 13 is a scarcity of available space within the confines of an engine assembly, 4 this bulkiness leads to problems of installation and accommodation.
The valve is necessarily thick in part because the coil spring 16 is mounted around the stem, which arrangement follows from the use of a 17 longitudinal drive.
18 That the valve is necessarily long follows from the l9 incorporation of longitudinal movement of the gate and stem between longitudinally aligned storage and operative positions.
21 Another problem has to do with sealing of the stem. It 22 protrudes out of the housing through an opening formed at the parting 23 line of the housing sections. Tapping in at the parting line is 24 necessary in order to be able to install a seal in a facile and in-expensive manner. However, it is difficult to so accurately machine the 26 semi-c;rcular openings in the housing sections that they are perfect 27 matches, so that the seal, when mounted in the surfaces of the 28 openings, fits properly and provides an air-tight seal between 29 the stem and the housing.
1~7~3862 1 Still another problem has to do with the positioning of the 2 lock-out cylinder. In the Oakes valve, it is positioned in a plane 3 perpendicular to the parting plane of the housing. This is done 4 because it is easier to tap into the transverse wall of the housing than to tap in at the parting line. This arrangement further interferes 6 with the objective of developing compactness as an attribute of the valve.
7 With this background in mind, it will be understood that there 8 js a need for an air cut-off valve which is characterized by compactness, 9 ease of sealing, and ease of manufacture.
lo SUMMARY OF THE INVENTION
11 In accordance with the present invention, an air cut-off 12 valve is provided in which the valve member swings through an arc about 13 a transverse pivot member, when moving between the stored and 14 operative positions.
One result of this arrangement is that the pivot member 16 may be journalled in the side walls of the valve and sealed in an ef-17 fective and simple manner.
18 Another result is that the length of valve is relatively 19 short, as it does not have to accommodate a stem which moves between longitudinally aligned positions.
21 The arrangement further lends itself to comblnation with a 22 side drive. That is, the biasing means, such as a spring, may be 23 disposed in the main plane of the housing to act against the stem from24 the side. The increase in valve thickness, which arises from concentrically positioning the stem, spring and gate, is thereby avoided.
26 Still another advantage of the arrangement is that it lends 27 itself to using a hollowed out body and flat cover to form the housing.
28 With such a housing, the lock-out means may be tapped into the side wall 29 of the body. As a result, the lock-out means extends in the main plane of the housing, thereby ensuring compactness.
~7~862 1 By making these modifications, a cut-off valve is provided 2 which has a thickness of about 1-1/2" and a length from the air line 3 of about 10". Also, sealing of the valve is improved.
4 Broadly stated, the invention is an air cut-off valve comprising: a housing formed by a hollow body and a flat cover secured 6 thereto, said housing defining an internal chamber and having upstream 7 and downstream walls which form inlet and outlet ports respectively,8 said housing having gate and stem ends and being adapted to be connected g in an air supply line whereby the ports and chamber form part of theair flow path, said ports being positioned at one side of the chamber 11 at the gate end, whereby the other side of the chamber provides a 12 storage cavity; a valve assembly comprising a stem having a gate mounted 13 thereon at one end thereof, said gate being located in the gate end 14 of the chamber, said stem extending into the stem end of the chamber;
a pivot member positioned in the stem end of the chamber; said stem 16 being pivotally mounted on the pivot member so that the gate is adapted 17 to move about said pivot member along an arc from the stored position 18 in the storage cavity to an operative position in which it blocks one 19 of the ports and seals against the wall forming such port; said valve assembly being wholly disposed within the chamber; lock-out means, 21 associated with the stem end of the housing and being positioned so 22 that its main axis extends substantially parallel to the main plane 23 of the housing, for mechanically locking the stem in the stored position 24 until disengaged, said lock-out means being manually disengageable to release the stem when required; and mechanical drive means, also 26 associated with the stem end of the housing and being positioned so 27 that its main axis extends substantially parallel to the main plane of 28 the housing, for normally urging the stem to the operative position,29 when the lock-out means is disengaged, to shift the gate from the stored position to the operative position.
~ ~k- 6 --il~7886Z
1 DESCRIPTION:OF`.THE DRAWINGS
_ _ 2 Figure 1 is a top;plan v;ew of the body of the housing, 3 Figure 2 is a bottom:plan view of the cover of the housing;
4 Figure 3a is a top view, partly in section, showing the body with the valve member in the stored position, the drive means retracted, 6 and the lock-out means engaged;
7 Figure 3b is identical to Figure 3a except that the valve 8 member is in the operative position~ the drive means is extended~ and 9 the lock-out means is disengaged, ; ~ -6a -1 Figure 4 is a side sectional view taken along the lines A--A2 of Figure 3bi 3 Figure ~ is a side sectional view taken along the line B--B
4 of Figure 3a;
Figure 6 is a perspective view of a component, the compensator 6 plate, used in the assembly; and 7 Figure 7 is a top view, partly in section, similar to Figure 3a 8 but showing a cylinder as the drive means and a stop screw to limit the 9 extent of valve member rotation.
DESCRIPTION OF THE PREFERRED EMBODIMENT
11 The Housing 12 The cut-off valve 1 comprises a housing 2, which consists 13 of a hollow body 3 and a flat cover 4 bolted together. The housing 2 is 14 T-shaped in configuration, when viewed in plan.
The body 3 is formed by a transverse wall 5, termed "the 16 upstream wall", and a side wall 6. An internal T-shaped recess or 17 chamber 7 is defined by the walls 5,6.
18 The upstream wall 5 comprises a collar 70, which defines 19 an inlet port 8 extending through said wall and communicating with one side of the internal chamber 7. The collar 70 is adapted to connect 21 with the air supply line (not shown) of the motor.
22 The inner surface of the upstream wall 5 is stepped slightly, 23 to provide an elevated upper surface 9 and a recessed lower surface 10, 24 said surfaces being divided by a shoulder 11.
A first bore 12 extends through the side wall 6 at its lower 26 end, to accommodate a lock-out means 13.
A second bore 14 similarly extends through the side wall 2 6 above the first bore 12, to accommodate a drive means 15.
3 A third bore 16 extends through the lower end of the upstream 4 wall 5, to accommodate a pivot shaft 17.
Turning now to the cover 4, it conforms in shape to the out-6 line of the body 3. Both the body 3 and cover 4 have machined contact 7 surfaces which sealably engage at A and B to prevent air leakage.
8 The cover 4 comprises a transverse wall 18, termed 'the down-9 stream wall'. The cover 4 further comprises a collar 19, which defines an outlet port 20. The outlet port 20 is aligned with the inlet port 8 11 and provides communication through the downstream wall 18 with one side 12 of the internal chamber 7. The collar 19 is adapted to connect with the 13 a;r supply line.
14 The inlet port 8, internal chamber 7 and outlet port 19 are operative, when the valve 1 is installed in an air supply line, to form 16 part of the air flow path.
17 A fourth bore 21 extends through the lower end of the 18 downstream wall 18 and is aligned with the third bore 16i this fourth 19 bore 21 functions to accommodate the pivot shaft 17.
The Blocking and Sealing Means 21 A gate valve 22 is pivotally mounted for movement within 22 the chamber 7. The gate valve 22 functions to block and seal one of the 23 ports 8, 20, to interrupt the air flow.
24 The gate valve 22 comprises a biasing element or stem 23 and a sealing element or gate 24 connected with the upper end of 26 said stem. The stem 23 and gate 24 are wholly contained within the 27 chamber 7.
li7~ i2 1 The vertical stem 23 ;s p;votally mounted at ;ts lower end2 on a horizontal pivot shaft 17. The pivot shaft 17 is journalled in 3 the third and fourth bores 16, 21. 0-rings 25 seal the pivot shaft 17 4 against the bounding surfaces of the bores 16, 21, to prevent air leakage.
6 The stem 23 may be pivoted to carry the gate 24 along an arc 7 between a stored position, shown in Figure 3a, in the storage c~vity 8 portion 26 of the chamber 7, and an operative position, shown in Figure9 3b, wherein it functions to block one or both of the ports 8,20.
The circular gate 24 is formed with a central bore in which 11 the upper end of the stem 23 is received. The gate 24 is free-floating 12 on the stem 23 - that is, it has a loose tolerance fit on the stem so 13 that it can rotate about the stem's main axis and can tilt at a slight 14 angle relative to said axis. In addition, the gate 24 is formed of resilient elastomer material. As a result of providing the free-floating 16 capability and forming the gate of resilient material, a particularly 17 effective seal may be achieved.
18 A preferred means for mounting the stem 23 on the pivot 19 shaft 17 is provided. More particularly, the stem 23 has a clevis 27 at its lower end. An L-shaped compensator plate 28 extends through 21 the clevis 27. The compensator plate 28 and clevis 27 define aligned 22 bores 29, 30, through which the pivot shaft 17 extends. A key 31 extends 23 through suitable bores (not shown) in the shaft 17, plate 28, and clevis 24 27, to hold them together. The plate 28 is formed with a resilient shoulder member 32, to bear against the clevis 27 when it moves to 26 the operative position.
1~7~62 1 Locking Means 2 A lock-out cylinder 13, of conventional design, is positioned 3 in the first bore 12 of the housing 2, to engage the compensator plate 28 4 and restrain the stem 23 keyed thereto in the stored position. More particu-larly, the cylinder 13 comprises a piston 33, which is normally outwardly 6 urged by a spring ~not shown) mounted within the cylinder barrel 34.
7 The piston 33 engages a notch 35 formed in the compensator 8 plate 28 to lock the latter against rotation. The end 36 of the piston 9 33, remote from the compensator plate 28, extends out the end of the barrel 34. This piston end 36 may be manually pulled with pliers to 1l disengage the piston 33 from the notch 35 and thereby release the 12 stem 23.
3 Drive Means 14 A plunger 37 is positioned within the second bore 14 of the housing 2. The outer end 38 of this plunger 37 contacts the stem 23.
16 A spring 39 is positioned within the bore 14 and acts to normally urge the 17 plunger 37 outwardly against the stem 23. A plug 40 is screwed into the 18 outer end of the bore 14, to provide a footing for the spring 39.
19 Upon disengaging the lock-out piston 33 and releasing the plate 28, the spring 39 extends and drives the stem 23, to cause it to 21 rotate about the pivot shaft 17 between the stored and operative 22 position.
23 Operation 24 When installed, the cut-off valve 1 is positioned in the air supply line with its upstream and downstream walls 5, 18 transverse to the 26 axis of the line. The ports 8, 20 communicate with the air line. The 27 ports 8,20 and chamber 7 form part of the air flow path.
1~7~386Z
1 The valve components are normally in the locked, stored 2 position. That is, the gate valve 22 is in the stored position shown in 3 Figure 3a. The lock-out piston 33 is extended and its end 36 engages the 4 notch 35 of the compensator plate 28. The plunger 37 is pressing against the stem 23, but it has compressed the drive spring 39. The gate 24 is 6 in the storage cavity portion 26 of the chamber 7 and the flow path through7 the valve 1 is open.
8 When the piston end 36 of the lock-out cylinder 13 is 9 pulled to the right, the piston 33 is retracted from the plate notch 35 andthe stem 23 is then free to rotate. The drive spring 39 expands and the 11 plunger 37 biases or rotates the stem 23 to the left about its pivot 12 shaft 17. The gate 24 is thereby moved along an arc between the stored 13 position and the operative position shown in Figure 3b. The engine vacuum 14 sucks the gate 24 firmly against the downstream wall 18 to block and seal the outlet port 20.
16 To reset the gate valve 22, the handle 41, secured to the 17 pivot shaft 17, is pulled to rotate the gate valve back to the locked, 18 stored position.
19 Alternative In a variation of the invention, shown in Figure 7, the 21 locking and driving functions may be combined in a single component, 22 for example an air cylinder 42 pivotally secured to the stem 23.
23 Advantages 24 The specific embodiment of the invention shown in the drawings is characterized by the following advantages:
26 (1) the valve is compact, and 27 ~2) the pivot shaft is easily sealed.
1~86Z
1 Scope 2 The best mode of the inventi:on has been shown and described 3 in the disclosure. However, this is a speci.fic embodiment of the 4 invention. The scope of the invention is defined in the following claims.
2. Prior Art 6 An air cut-off valve is commonly employed to close the air 7 intake line extending between the turbocharger and air intake manifold 8 of a diesel or gas-fuelled engine. The valve is used to withhold air 9 supply from the engine, in the event that it is sensed that hydrocarbons are entrained in the air. These valves are particularly needed, for 11 example, in connection with the engines of a drilling rig, where there 12 is a significant possibility that gas will escape from the well and cause 13 the engines to continue running, even though the fuel supply has been 14 closed off. The continued operation of the engines carries a high risk of causing the escaping gas to ignite.
16 The cut-off valve heretofore most widely used in this service 17 in North America is disclosed in Canadian Patent 587,457, issued to 18 Oakes. This valve is described in some detail below because the present 19 invention uses some of its concepts, but incorporates modifications with a view to overcoming some of its shortcomings.
21 The Oakes valve comprises a hollow, box-like, sectional 22 housing having a greater length than width. This housing is formed 23 using two hollowed-out halves or sections which are bolted together. An 24 air inlet port extends through the upper end of the transverse upstream wall of one such section and an outlet port extends through the upper ` 26 end of the downstream wall of the other section. The ports are 27 linearly aligned. In use, the valve is inserted in the air line so 28 that the ports and the chamber internal of the housing form part of ., 29 the air flow path. The long housing extends well below the air line, for a purpose to be explained.
117886;:
1 A valve member, comprisiny a stem and a gate carried thereby, 2 is arranged to reciprocate longitudinally within the chamber. This valve 3 member is movable between stored and operative positions. In the stored 4 position, the gate is disposed in a storage cavity defined by the lower end of the chamber, out of the air flow pathi the stem extends out the bottom 6 Of the housing. In the operative position, the gate is disposed across 7 the ports, seals against the housing, and effectively blocks the air flow 8 path.
g A spring is provided to bias the stem and its attached gate from the stored position to the operative position. This spring is positioned 11 around and along the stem and extends between the bottom wall of the housing 12 and a shoulder on the val~e member. When the valve member is locked by 13 suitable locking means in the stored position, the spring is compressed.
14 When the locking means is released, the spring expands and biases the valve member to the operative or blocking position.
16 The aforementioned releasable locking means comprises a 17 lock-out cylinder which has a spring-loaded shaft that engages a recess 18 in the valve stem, to lock the stem in the stored position.
19 In summary, the Oakes valve involves in concept the following features:
21 (1) a gate positioned in a sealed hollow, in-line housing, 22 ~ which gate is movable between a stored position, in 23 which it is locked in a storage cavity formed by the 24 housing out of the air flow path, and an operative position, in which it blocks and seals the air flow 26 path; and 117~862 l (2) a stem which carries the gate and biases it between 2 the positions, sa;d stem cooperating with mover means 3 and locking means to provide the motion needed at the 4 appropriate time.
The present invention also incorporates the aforementioned 6 features. However, in applicant's view, the Oakes valve, while successful, 8 has some shortcomings. The present invention involves significant structural and conceptual changes which have alleviated or done away 9 with these problems.
One such problem associated with the Oakes valve is its 11 size. It has a thickness of about 2-l/2" and a downwardly extending length 12 of about 17", measured from the centreline of the air line. Since there 13 is a scarcity of available space within the confines of an engine assembly, 4 this bulkiness leads to problems of installation and accommodation.
The valve is necessarily thick in part because the coil spring 16 is mounted around the stem, which arrangement follows from the use of a 17 longitudinal drive.
18 That the valve is necessarily long follows from the l9 incorporation of longitudinal movement of the gate and stem between longitudinally aligned storage and operative positions.
21 Another problem has to do with sealing of the stem. It 22 protrudes out of the housing through an opening formed at the parting 23 line of the housing sections. Tapping in at the parting line is 24 necessary in order to be able to install a seal in a facile and in-expensive manner. However, it is difficult to so accurately machine the 26 semi-c;rcular openings in the housing sections that they are perfect 27 matches, so that the seal, when mounted in the surfaces of the 28 openings, fits properly and provides an air-tight seal between 29 the stem and the housing.
1~7~3862 1 Still another problem has to do with the positioning of the 2 lock-out cylinder. In the Oakes valve, it is positioned in a plane 3 perpendicular to the parting plane of the housing. This is done 4 because it is easier to tap into the transverse wall of the housing than to tap in at the parting line. This arrangement further interferes 6 with the objective of developing compactness as an attribute of the valve.
7 With this background in mind, it will be understood that there 8 js a need for an air cut-off valve which is characterized by compactness, 9 ease of sealing, and ease of manufacture.
lo SUMMARY OF THE INVENTION
11 In accordance with the present invention, an air cut-off 12 valve is provided in which the valve member swings through an arc about 13 a transverse pivot member, when moving between the stored and 14 operative positions.
One result of this arrangement is that the pivot member 16 may be journalled in the side walls of the valve and sealed in an ef-17 fective and simple manner.
18 Another result is that the length of valve is relatively 19 short, as it does not have to accommodate a stem which moves between longitudinally aligned positions.
21 The arrangement further lends itself to comblnation with a 22 side drive. That is, the biasing means, such as a spring, may be 23 disposed in the main plane of the housing to act against the stem from24 the side. The increase in valve thickness, which arises from concentrically positioning the stem, spring and gate, is thereby avoided.
26 Still another advantage of the arrangement is that it lends 27 itself to using a hollowed out body and flat cover to form the housing.
28 With such a housing, the lock-out means may be tapped into the side wall 29 of the body. As a result, the lock-out means extends in the main plane of the housing, thereby ensuring compactness.
~7~862 1 By making these modifications, a cut-off valve is provided 2 which has a thickness of about 1-1/2" and a length from the air line 3 of about 10". Also, sealing of the valve is improved.
4 Broadly stated, the invention is an air cut-off valve comprising: a housing formed by a hollow body and a flat cover secured 6 thereto, said housing defining an internal chamber and having upstream 7 and downstream walls which form inlet and outlet ports respectively,8 said housing having gate and stem ends and being adapted to be connected g in an air supply line whereby the ports and chamber form part of theair flow path, said ports being positioned at one side of the chamber 11 at the gate end, whereby the other side of the chamber provides a 12 storage cavity; a valve assembly comprising a stem having a gate mounted 13 thereon at one end thereof, said gate being located in the gate end 14 of the chamber, said stem extending into the stem end of the chamber;
a pivot member positioned in the stem end of the chamber; said stem 16 being pivotally mounted on the pivot member so that the gate is adapted 17 to move about said pivot member along an arc from the stored position 18 in the storage cavity to an operative position in which it blocks one 19 of the ports and seals against the wall forming such port; said valve assembly being wholly disposed within the chamber; lock-out means, 21 associated with the stem end of the housing and being positioned so 22 that its main axis extends substantially parallel to the main plane 23 of the housing, for mechanically locking the stem in the stored position 24 until disengaged, said lock-out means being manually disengageable to release the stem when required; and mechanical drive means, also 26 associated with the stem end of the housing and being positioned so 27 that its main axis extends substantially parallel to the main plane of 28 the housing, for normally urging the stem to the operative position,29 when the lock-out means is disengaged, to shift the gate from the stored position to the operative position.
~ ~k- 6 --il~7886Z
1 DESCRIPTION:OF`.THE DRAWINGS
_ _ 2 Figure 1 is a top;plan v;ew of the body of the housing, 3 Figure 2 is a bottom:plan view of the cover of the housing;
4 Figure 3a is a top view, partly in section, showing the body with the valve member in the stored position, the drive means retracted, 6 and the lock-out means engaged;
7 Figure 3b is identical to Figure 3a except that the valve 8 member is in the operative position~ the drive means is extended~ and 9 the lock-out means is disengaged, ; ~ -6a -1 Figure 4 is a side sectional view taken along the lines A--A2 of Figure 3bi 3 Figure ~ is a side sectional view taken along the line B--B
4 of Figure 3a;
Figure 6 is a perspective view of a component, the compensator 6 plate, used in the assembly; and 7 Figure 7 is a top view, partly in section, similar to Figure 3a 8 but showing a cylinder as the drive means and a stop screw to limit the 9 extent of valve member rotation.
DESCRIPTION OF THE PREFERRED EMBODIMENT
11 The Housing 12 The cut-off valve 1 comprises a housing 2, which consists 13 of a hollow body 3 and a flat cover 4 bolted together. The housing 2 is 14 T-shaped in configuration, when viewed in plan.
The body 3 is formed by a transverse wall 5, termed "the 16 upstream wall", and a side wall 6. An internal T-shaped recess or 17 chamber 7 is defined by the walls 5,6.
18 The upstream wall 5 comprises a collar 70, which defines 19 an inlet port 8 extending through said wall and communicating with one side of the internal chamber 7. The collar 70 is adapted to connect 21 with the air supply line (not shown) of the motor.
22 The inner surface of the upstream wall 5 is stepped slightly, 23 to provide an elevated upper surface 9 and a recessed lower surface 10, 24 said surfaces being divided by a shoulder 11.
A first bore 12 extends through the side wall 6 at its lower 26 end, to accommodate a lock-out means 13.
A second bore 14 similarly extends through the side wall 2 6 above the first bore 12, to accommodate a drive means 15.
3 A third bore 16 extends through the lower end of the upstream 4 wall 5, to accommodate a pivot shaft 17.
Turning now to the cover 4, it conforms in shape to the out-6 line of the body 3. Both the body 3 and cover 4 have machined contact 7 surfaces which sealably engage at A and B to prevent air leakage.
8 The cover 4 comprises a transverse wall 18, termed 'the down-9 stream wall'. The cover 4 further comprises a collar 19, which defines an outlet port 20. The outlet port 20 is aligned with the inlet port 8 11 and provides communication through the downstream wall 18 with one side 12 of the internal chamber 7. The collar 19 is adapted to connect with the 13 a;r supply line.
14 The inlet port 8, internal chamber 7 and outlet port 19 are operative, when the valve 1 is installed in an air supply line, to form 16 part of the air flow path.
17 A fourth bore 21 extends through the lower end of the 18 downstream wall 18 and is aligned with the third bore 16i this fourth 19 bore 21 functions to accommodate the pivot shaft 17.
The Blocking and Sealing Means 21 A gate valve 22 is pivotally mounted for movement within 22 the chamber 7. The gate valve 22 functions to block and seal one of the 23 ports 8, 20, to interrupt the air flow.
24 The gate valve 22 comprises a biasing element or stem 23 and a sealing element or gate 24 connected with the upper end of 26 said stem. The stem 23 and gate 24 are wholly contained within the 27 chamber 7.
li7~ i2 1 The vertical stem 23 ;s p;votally mounted at ;ts lower end2 on a horizontal pivot shaft 17. The pivot shaft 17 is journalled in 3 the third and fourth bores 16, 21. 0-rings 25 seal the pivot shaft 17 4 against the bounding surfaces of the bores 16, 21, to prevent air leakage.
6 The stem 23 may be pivoted to carry the gate 24 along an arc 7 between a stored position, shown in Figure 3a, in the storage c~vity 8 portion 26 of the chamber 7, and an operative position, shown in Figure9 3b, wherein it functions to block one or both of the ports 8,20.
The circular gate 24 is formed with a central bore in which 11 the upper end of the stem 23 is received. The gate 24 is free-floating 12 on the stem 23 - that is, it has a loose tolerance fit on the stem so 13 that it can rotate about the stem's main axis and can tilt at a slight 14 angle relative to said axis. In addition, the gate 24 is formed of resilient elastomer material. As a result of providing the free-floating 16 capability and forming the gate of resilient material, a particularly 17 effective seal may be achieved.
18 A preferred means for mounting the stem 23 on the pivot 19 shaft 17 is provided. More particularly, the stem 23 has a clevis 27 at its lower end. An L-shaped compensator plate 28 extends through 21 the clevis 27. The compensator plate 28 and clevis 27 define aligned 22 bores 29, 30, through which the pivot shaft 17 extends. A key 31 extends 23 through suitable bores (not shown) in the shaft 17, plate 28, and clevis 24 27, to hold them together. The plate 28 is formed with a resilient shoulder member 32, to bear against the clevis 27 when it moves to 26 the operative position.
1~7~62 1 Locking Means 2 A lock-out cylinder 13, of conventional design, is positioned 3 in the first bore 12 of the housing 2, to engage the compensator plate 28 4 and restrain the stem 23 keyed thereto in the stored position. More particu-larly, the cylinder 13 comprises a piston 33, which is normally outwardly 6 urged by a spring ~not shown) mounted within the cylinder barrel 34.
7 The piston 33 engages a notch 35 formed in the compensator 8 plate 28 to lock the latter against rotation. The end 36 of the piston 9 33, remote from the compensator plate 28, extends out the end of the barrel 34. This piston end 36 may be manually pulled with pliers to 1l disengage the piston 33 from the notch 35 and thereby release the 12 stem 23.
3 Drive Means 14 A plunger 37 is positioned within the second bore 14 of the housing 2. The outer end 38 of this plunger 37 contacts the stem 23.
16 A spring 39 is positioned within the bore 14 and acts to normally urge the 17 plunger 37 outwardly against the stem 23. A plug 40 is screwed into the 18 outer end of the bore 14, to provide a footing for the spring 39.
19 Upon disengaging the lock-out piston 33 and releasing the plate 28, the spring 39 extends and drives the stem 23, to cause it to 21 rotate about the pivot shaft 17 between the stored and operative 22 position.
23 Operation 24 When installed, the cut-off valve 1 is positioned in the air supply line with its upstream and downstream walls 5, 18 transverse to the 26 axis of the line. The ports 8, 20 communicate with the air line. The 27 ports 8,20 and chamber 7 form part of the air flow path.
1~7~386Z
1 The valve components are normally in the locked, stored 2 position. That is, the gate valve 22 is in the stored position shown in 3 Figure 3a. The lock-out piston 33 is extended and its end 36 engages the 4 notch 35 of the compensator plate 28. The plunger 37 is pressing against the stem 23, but it has compressed the drive spring 39. The gate 24 is 6 in the storage cavity portion 26 of the chamber 7 and the flow path through7 the valve 1 is open.
8 When the piston end 36 of the lock-out cylinder 13 is 9 pulled to the right, the piston 33 is retracted from the plate notch 35 andthe stem 23 is then free to rotate. The drive spring 39 expands and the 11 plunger 37 biases or rotates the stem 23 to the left about its pivot 12 shaft 17. The gate 24 is thereby moved along an arc between the stored 13 position and the operative position shown in Figure 3b. The engine vacuum 14 sucks the gate 24 firmly against the downstream wall 18 to block and seal the outlet port 20.
16 To reset the gate valve 22, the handle 41, secured to the 17 pivot shaft 17, is pulled to rotate the gate valve back to the locked, 18 stored position.
19 Alternative In a variation of the invention, shown in Figure 7, the 21 locking and driving functions may be combined in a single component, 22 for example an air cylinder 42 pivotally secured to the stem 23.
23 Advantages 24 The specific embodiment of the invention shown in the drawings is characterized by the following advantages:
26 (1) the valve is compact, and 27 ~2) the pivot shaft is easily sealed.
1~86Z
1 Scope 2 The best mode of the inventi:on has been shown and described 3 in the disclosure. However, this is a speci.fic embodiment of the 4 invention. The scope of the invention is defined in the following claims.
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An air cut-off valve comprising:
a housing formed by a hollow body and a flat cover secured thereto, said housing defining an internal chamber and having upstream and downstream walls which form inlet and outlet ports respectively, said housing having gate and stem ends and being adapted to be connected to an air supply line whereby the ports and chamber form part of the air flow path, said ports being positioned at one side of the chamber at the gate end, whereby the other side of the chamber provides a storage cavity;
a valve assembly comprising a stem having a gate mounted thereon at one end thereof, said gate being located in the gate end of the chamber, said stem extending into the stem end of the chamber;
a pivot member positioned in the stem end of the chamber;
said stem being pivotally mounted on the pivot member so that the gate is adapted to move about said pivot member along an arc from the stored position in the storage cavity to an operative position in which it blocks one of the ports and seals against the wall forming such port;
said valve assembly being wholly disposed within the chamber;
lock-out means, associated with the stem end of the housing and being positioned so that its main axis extends substantially parallel to the main plane of the housing, for mechanically locking the stem in the stored position until disengaged, said lock-out means being manually disengageable to release the stem when required;
and mechanical drive means, also associated with the stem end of the housing and being positioned so that its main axis extends substantially parallel to the main plane of the housing, for normally urging the stem to the operative position, when the lock-out means is disengaged, to shift the gate from the stored position to the operative position.
a housing formed by a hollow body and a flat cover secured thereto, said housing defining an internal chamber and having upstream and downstream walls which form inlet and outlet ports respectively, said housing having gate and stem ends and being adapted to be connected to an air supply line whereby the ports and chamber form part of the air flow path, said ports being positioned at one side of the chamber at the gate end, whereby the other side of the chamber provides a storage cavity;
a valve assembly comprising a stem having a gate mounted thereon at one end thereof, said gate being located in the gate end of the chamber, said stem extending into the stem end of the chamber;
a pivot member positioned in the stem end of the chamber;
said stem being pivotally mounted on the pivot member so that the gate is adapted to move about said pivot member along an arc from the stored position in the storage cavity to an operative position in which it blocks one of the ports and seals against the wall forming such port;
said valve assembly being wholly disposed within the chamber;
lock-out means, associated with the stem end of the housing and being positioned so that its main axis extends substantially parallel to the main plane of the housing, for mechanically locking the stem in the stored position until disengaged, said lock-out means being manually disengageable to release the stem when required;
and mechanical drive means, also associated with the stem end of the housing and being positioned so that its main axis extends substantially parallel to the main plane of the housing, for normally urging the stem to the operative position, when the lock-out means is disengaged, to shift the gate from the stored position to the operative position.
2. The valve as set forth in claim 1 wherein:
the gate has a loose fit on the stem so that it is free-floating, said gate having an elastomer sealing surface, whereby, when the valve is in use in connection with an engine, the vacuum created by the engine is operative to pull the gate into intimate sealing relationship with the housing in the operative position.
the gate has a loose fit on the stem so that it is free-floating, said gate having an elastomer sealing surface, whereby, when the valve is in use in connection with an engine, the vacuum created by the engine is operative to pull the gate into intimate sealing relationship with the housing in the operative position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000411184A CA1178862A (en) | 1982-09-10 | 1982-09-10 | Engine air cut-off valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000411184A CA1178862A (en) | 1982-09-10 | 1982-09-10 | Engine air cut-off valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1178862A true CA1178862A (en) | 1984-12-04 |
Family
ID=4123564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000411184A Expired CA1178862A (en) | 1982-09-10 | 1982-09-10 | Engine air cut-off valve |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1178862A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6032921A (en) * | 1996-07-24 | 2000-03-07 | Barber Industries, Inc. | Engine shutdown valve |
| CN110529264A (en) * | 2018-05-25 | 2019-12-03 | 卡特彼勒公司 | Air cutoff valve |
| CN110529263A (en) * | 2018-05-23 | 2019-12-03 | 卡特彼勒公司 | Air cutoff valve |
-
1982
- 1982-09-10 CA CA000411184A patent/CA1178862A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6032921A (en) * | 1996-07-24 | 2000-03-07 | Barber Industries, Inc. | Engine shutdown valve |
| CN110529263A (en) * | 2018-05-23 | 2019-12-03 | 卡特彼勒公司 | Air cutoff valve |
| CN110529264A (en) * | 2018-05-25 | 2019-12-03 | 卡特彼勒公司 | Air cutoff valve |
| CN110529264B (en) * | 2018-05-25 | 2023-04-11 | 卡特彼勒公司 | Air stop valve |
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