JP2017102581A - Pressure-reducing valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a filter between a valve seat and a housing while suppressing deformation of the valve seat.SOLUTION: A pressure-reducing valve 1 comprises: a housing 2; an inlet 4 and an outlet 6 provided at both ends of the housing 2; a piston 9 provided inside the housing 2; a rod 9a extending from the piston 9 to the side of the inlet 4; a valve body 12 provided at the tip of the rod 9a; a valve seat 13 on which the valve body 12 can be seated in the housing 2; a valve chamber 14 around the valve body 12 on the downstream side of the valve seat 13; a pressure control chamber 17 provided between the housing 2 and the piston 9 on the downstream side of the piston 9, and communicated with the outlet 6; a flow path 9b provided on the rod 9a and the piston 9 through which fluid flows from the valve chamber 14 to the pressure control chamber 17; and a spring 21 energizing the piston 9 and the rod 9a in a direction in which the valve seat 12 separates from the valve seat 13. A filter 15 that captures foreign matters in the fluid is arranged at an inlet side flow path 5a upstream of the valve seat 13 in the housing 2, a bush 16 is arranged between the filter 15 and the valve seat 13 so as to fix the filter 15 in the housing 2, and the bush 16 is formed of a material whose rigidity is higher than that of the valve seat 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure reducing valve used to decompress a high pressure fluid such as a high pressure gas.

  Conventionally, as this type of technology, for example, a high voltage regulator described in Patent Document 1 below is known. As shown in the sectional view of FIG. 5, the high-pressure regulator 61 is moved in the axial direction within the housing 62, the inlet 63 and the outlet 64 provided at one end and the other end in the axial direction of the housing 62, and the inside of the housing 62. A piston 65 that can be provided; a rod 65a that extends in the axial direction from the piston 65 toward the inlet 63; a sliding portion 66 that is provided in the housing 62 and on which the rod 65a slides relative to the housing 62; A valve body 67 provided at the tip of 65a, a valve seat 68 provided with a valve body 67 so that the valve body 67 can be seated in the housing 62, and a valve chamber formed around the valve body 67 on the downstream side of the valve seat 68. 69, the flow path 65b provided in the piston 65 for flowing the fluid from the valve chamber 69 to the downstream side of the piston 65, and the piston 65 and the valve body 67 in a direction away from the valve seat 68. It includes a spring 70 for biasing the rod 65a, the pressure regulating chamber 71 provided between the housing 62 at the downstream side of the piston 65, and a seal member 72 provided on the sliding portion 66. The seal member 72 is disposed downstream of the valve chamber 69 and upstream of the pressure regulating chamber 71. The high-pressure regulator 61 allows a high-pressure fluid (for example, hydrogen gas) introduced from the inlet 63 to flow into the pressure regulating chamber 71 between the valve body 67 and the valve seat 68 via the flow path 65b. The pressure is reduced by the balance between the pressure of the fluid at 71 and the biasing force of the spring 70 and is led out from the outlet 64.

  Here, in this type of high-pressure regulator 61, a filter for capturing foreign matter in the fluid may be provided on the inlet side. The filter is formed to have a predetermined thickness by, for example, stacking a plurality of metal mesh materials. When this type of filter is provided for the above-described high-pressure regulator 61, for example, a configuration shown in a partial cross-sectional view in FIG. 6 is conceivable. That is, in order to fix the filter 77 upstream of the valve seat 76 while preventing the housing 62 from dropping off, the valve seat 76 is formed of a resin as a separate member from the housing 62, and the flow path 62 a that leads to the inlet 63 is formed. It is conceivable to fix the filter 77 between the valve seat 76 and the housing 62 in the middle.

Special table 2010-533268 gazette

  However, in the high-pressure regulator 61 described above, when the filter 77 is fixed as shown in FIG. 6, the valve element 67 is seated on the valve seat 76 with a strong force due to the pressure of the pressure regulating chamber 71 acting on the piston 65 (valve closing). There are things to do. In this case, if the valve seat 76 is pressed against the easily deformable filter 77, the valve seat 76 may be deformed. This is because the deformation of the valve seat 76 is allowed by providing the low-rigidity filter 77 in contact with the valve seat 76. Since the seat of the valve body 67 with respect to the valve seat 76 can frequently occur, deformation stress frequently acts on the valve seat 76, and there is a concern about the breakage of the valve seat 76. On the other hand, since the valve seat 76 may be deformed by receiving the pressure of the fluid flowing into the flow path 62a from the inlet 63, there is a concern that the valve seat 76 may be damaged by the deformation stress.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a pressure reducing valve capable of fixing a filter between a valve seat and a housing while suppressing deformation of the valve seat. It is in.

  In order to achieve the above object, the invention described in claim 1 is provided with a housing, inlets and outlets provided at one end and the other end in the axial direction of the housing, and movable in the axial direction within the housing. A piston that extends in the axial direction from the piston toward the inlet side, a valve body provided at the tip of the rod, and a valve body that can be seated in the housing, and is formed as a separate member from the housing. A valve seat formed around the valve body on the downstream side of the valve seat, a pressure regulating chamber provided between the housing on the downstream side of the piston, and from the valve chamber to the pressure regulating chamber Provided between the valve seat and the inlet in the housing, a piston flow path provided in the rod and the piston for flowing the fluid, a spring for urging the piston and the rod in a direction in which the valve body separates from the valve seat, and a housing An inlet-side flow path formed from the inlet. The introduced fluid is caused to flow to the pressure regulating chamber through the piston channel between the inlet side channel, the valve body and the valve seat, and the pressure of the fluid in the pressure regulating chamber and the spring In a pressure reducing valve that is decompressed by a balance with an urging force and led out from the outlet, a filter disposed in an inlet-side flow path upstream of a valve seat in the housing and capturing foreign matter in the fluid, and the housing The bushing is disposed between the filter and the valve seat to fix the filter in (4), and the bush is formed of a material having rigidity higher than that of the valve seat.

  According to the configuration of the invention, the filter is fixed between the housing and the valve seat via the bush having higher rigidity than the valve seat in the inlet-side flow path upstream of the valve seat in the housing. Therefore, even if the valve body is seated (closed) with a strong force on the valve seat, the valve seat is held by the highly rigid bush and deformation of the valve seat is restricted.

  In order to achieve the above object, according to a second aspect of the present invention, in the first aspect of the present invention, the inlet-side flow passage is enlarged in diameter in accordance with the passage area of the filter on the upstream side of the filter, and the bush Has a bush passage in the center, and the bush passage is enlarged in the vicinity of the downstream side of the filter in accordance with the passage area of the filter, and has a smaller diameter in the vicinity of the valve seat than in the vicinity of the filter. The purpose.

  According to the configuration of the invention, in addition to the operation of the invention according to claim 1, the inlet-side flow path is enlarged in diameter (the diameter is increased) in accordance with the passage area of the filter on the upstream side of the filter. The fluid flows over substantially the entire area of the filter passage area, and the entire filter is effectively used as the foreign matter capturing area. In addition, the bush passage is enlarged in the vicinity of the filter in the vicinity of the downstream side of the filter to have a smaller diameter than the vicinity of the filter in the vicinity of the valve seat, so that the fluid flow to the valve seat is reduced. It is done. Furthermore, the foreign matter supplement area of the filter can be made larger than the passage area of the valve seat.

  To achieve the above object, according to a third aspect of the present invention, in the first aspect of the present invention, the housing includes a main body case that houses a piston, a rod, a valve body and a spring, and an inlet side case including an inlet. The outer peripheral edge of the valve seat is sandwiched between the main body case and the inlet side case, and the inner diameter of the valve chamber is set smaller than the outer diameter of the bush at the part where the main body case contacts the valve seat Intended to be

  According to the configuration of the above invention, in addition to the operation of the invention according to claim 1, the inner diameter of the valve chamber is set smaller than the outer diameter of the bush at the portion where the main body case is in contact with the valve seat. Even if the pressure of the fluid flowing into the side flow path acts on the valve seat via the filter and the bush, the deformation of the valve seat is restricted.

  To achieve the above object, according to a fourth aspect of the present invention, in the second aspect of the present invention, the bush includes an end surface in contact with the valve seat on the downstream side, and an outlet of the bush passage is formed on the end surface. In addition, it is intended that a convex portion protruding in the direction of the valve seat is formed on the periphery of the outlet.

  According to the configuration of the invention, in addition to the action of the invention according to claim 2, since the convex portion protruding toward the valve seat is formed on the peripheral edge of the outlet at the downstream end face of the bush, the valve seat is The load received from the valve body is received by the convex portion of the bush.

  According to the first aspect of the present invention, it is possible to fix the filter between the valve seat and the housing while suppressing the deformation of the valve seat due to the seating of the valve body in the pressure reducing valve.

  According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, the foreign matter capturing function by the filter can be effectively exhibited, and the valve by the pressure of the fluid acting on the valve seat from the upstream side Deformation of the seat can be suppressed.

  According to the invention of the third aspect, in addition to the effect of the invention of the first aspect, the deformation of the valve seat due to the pressure of the fluid acting on the valve seat from the upstream side can be suppressed.

  According to the invention described in claim 4, in addition to the effect of the invention described in claim 2, an increase in the load acting on the valve seat due to the seating of the valve body can be suppressed, and deformation of the valve seat can be further suppressed. Can do.

Sectional drawing which concerns on one Embodiment and shows a pressure-reduction valve. The expanded sectional view which concerns on one Embodiment and shows the characteristic part of a pressure-reduction valve. The perspective view which concerns on one Embodiment and shows a bush. The expanded sectional view which concerns on another embodiment and shows the characteristic part of a pressure-reduction valve. Sectional drawing which concerns on a prior art example and shows a high voltage | pressure regulator. Sectional drawing which concerns on a prior art example and shows a part of high voltage | pressure regulator which provided the filter.

  Hereinafter, an embodiment embodying a pressure reducing valve in the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a sectional view of a pressure reducing valve 1 according to this embodiment. The pressure reducing valve 1 includes a housing 2. The housing 2 is disposed at a metal main body case 3, one axial end portion (lower end in FIG. 1) of the housing 2, a metal inlet side case 5 having an inlet 4, and the other axial end portion of the housing 2. And a metal outlet-side case 7 having an outlet 6. The inlet side case 5 and the outlet side case 7 are fastened and fixed to the main body case 3 by bolts 8 respectively.

  The main body case 3 is a hollow cylinder, and a metal piston 9 that can move in the axial direction is provided inside. A rod 9 a extending in the axial direction toward the inlet 4 is integrally formed on one end side (the lower side in FIG. 1) of the piston 9 in the axial direction. The rod 9a has a smaller outer diameter at the distal end than at the proximal end. The main body case 3 includes a piston sliding portion 10 (a portion surrounded by a chain line ellipse in FIG. 1) where the outer periphery of the piston 9 slides relative to the case 3, and a rod 9 a relative to the main body case 3. A rod sliding portion 11 (a portion surrounded by a chain line ellipse in FIG. 1) on which the outer periphery slides is provided.

  A valve body 12 having a shape that converges toward the tip is provided at the tip of the rod 9a. Corresponding to the valve body 12, a valve seat 13 on which the tip of the valve body 12 can be seated (can be closed) is sandwiched between both cases 3 and 5 between the main body case 3 and the inlet side case 5. Provided. The valve seat 13 has a ring shape having a valve hole in the center, and is formed of resin separately from the cases 3 and 5. A valve chamber 14 is formed in the main body case 3 on the upstream side of the valve seat 13 and around the valve body 12.

  The inlet side case 5 is formed with an inlet side flow path 5a that communicates with the inlet 4. On the opposite side of the inlet side flow path 5a from the inlet 4 is formed a step portion 5b whose flow path diameter changes stepwise. The A metal mesh filter 15 for capturing foreign matter in the fluid and a metal bush 16 for suppressing the filter 15 are disposed in the step portion 5b. The bush 16 is disposed between the filter 15 and the valve seat 13. When the valve seat 13 is sandwiched between the main body case 3 and the inlet case 5, the filter 15 is pressed against the step portion 5 b via the bush 16.

  FIG. 2 is an enlarged cross-sectional view showing a portion of a chain line square S1 in FIG. As shown in FIGS. 1 and 2, the filter 15 is disposed in the middle of the inlet-side flow path 5 a upstream of the valve seat 13 in the housing 2. The bush 16 is disposed between the filter 15 and the valve seat 13 in order to fix the filter 15 in the housing 2. The bush 16 is formed of a material having higher rigidity than the valve seat 13. In this embodiment, the valve seat 13 is made of resin, whereas the bush 16 is made of stainless steel.

  As shown in FIGS. 1 and 2, the inlet-side flow path 5 a is enlarged in diameter according to the passage area of the filter 15 on the upstream side (lower side in FIG. 1) (the diameter is increased). ). The bush 16 includes a bush passage 16a at the center thereof, and the bush passage 16a is expanded in diameter in the vicinity of the downstream side of the filter 15 (upper side in FIG. 1) in accordance with the passage area of the filter 15. Near the filter 15 and with a smaller diameter than the vicinity of the filter 15.

  FIG. 3 is a perspective view of the bush 16. As shown in FIGS. 1 and 2, the outer peripheral edge of the valve seat 13 is sandwiched between the main body case 3 and the inlet side case 5. The inner diameter D1 of the valve chamber 14 is set to be smaller than the outer diameter D2 of the bush 16 at the portion where the main body case 3 contacts the valve seat 13. As shown in FIGS. 2 and 3, the bush 16 has an outlet 16 b of the bush channel 16 a formed on the end face on the downstream side (the upper side in FIGS. 1 and 2). Further, the bush 16 is formed with a convex portion 16c protruding in the direction of the valve seat 13 on the periphery of the outlet 16b. In this embodiment, the convex part 16c is formed in an annular shape so as to surround the periphery of the outlet 16b. Here, the relationship between the bush 16 and the inlet side case 5 is that the bush 16 protrudes upward in FIG. 1 from the step surface 5c that supports the valve seat 13 of the inlet side case 5 as shown in FIG. Not set to dimensions.

  A pressure regulating chamber 17 is provided between the piston 9 and the outlet side case 7 on the downstream side of the piston 9 (upper side in FIG. 1). In addition, an air chamber 18 communicating with the atmosphere is provided in the hollow portion of the main body case 3 on the upstream side of the piston 9 (the lower side in FIG. 1). An air hole 3 a that allows the atmosphere chamber 18 to communicate with the atmosphere is formed on the outer periphery of the main body case 3. A filter member 19 is assembled in the air hole 3a. In the outlet side case 7, an outlet side flow path 7 a leading to the outlet 6 is formed. The pressure regulating chamber 17 communicates with the outlet 6 through the outlet side flow path 7a. The outlet case 7 is provided with a relief valve 20. The relief valve 20 is configured to release the pressure to the outside when the pressure in the pressure regulating chamber 17 increases excessively. The inlet of the relief valve 20 communicates with the outlet channel 7a through the passage 7b.

  In order to allow fluid to flow from the valve chamber 14 toward the pressure regulating chamber 17, a piston flow path 9 b is formed at the center of the rod 9 a and the piston 9. The piston passage 9b communicates with the valve chamber 14 through a plurality of holes in the vicinity of the valve body 12. The atmospheric chamber 18 of the main body case 3 is provided with a spring 21 for biasing the piston 9 and the rod 9a in a direction in which the valve body 12 is separated from the valve seat 13.

  And in the rod sliding part 11, the 1st lip seal 22 is provided in the outer periphery of the rod 9a. The lip seal 22 has a V-shaped cross section and is assembled to a circumferential groove 9c formed on the outer periphery of the rod 9a. The first lip seal 22 is made of rubber and corresponds to the seal member of the present invention. On the other hand, in the piston sliding portion 10, a second lip seal 23 is provided on the outer periphery of the piston 9. The lip seal 23 is assembled in a circumferential groove 9 d formed on the outer periphery of the piston 9. The second lip seal 23 is made of rubber.

  The pressure reducing valve 1 configured as described above causes the fluid introduced from the inlet 4 to flow between the valve body 12 and the valve seat 13 into the pressure regulating chamber 17 via the piston flow path 9b. The pressure is reduced by the balance between the fluid pressure and the biasing force of the spring 21, and the pressure is derived from the outlet 6.

  Here, in the rod sliding portion 11, a first wear ring 31 for narrowing the clearance of the sliding portion 11 is provided on the outer periphery of the rod 9 a upstream from the first lip seal 22. The first wear ring 31 is a C-shaped ring and is assembled to a circumferential groove 9e formed on the outer periphery of the rod 9a.

  Further, in the piston sliding portion 10, a second wear ring 32 is provided on the outer periphery of the piston 9 downstream from the second lip seal 23 to narrow the gap between the sliding portions 10. The wear ring 32 is a C-shaped ring and is assembled to a circumferential groove 9 f formed on the outer periphery of the piston 9.

  According to the pressure reducing valve 1 of this embodiment described above, the fluid (for example, hydrogen gas) introduced from the inlet 4 is regulated between the valve body 12 and the valve seat 13 via the piston flow path 9b. The pressure is reduced by the balance between the fluid pressure in the pressure regulating chamber 17 and the urging force of the spring 21, and is led out from the outlet 6. Specifically, when the fluid is not supplied to the inlet 4 of the pressure reducing valve 1, the piston 9 is pushed upward by the biasing force of the spring 21, and the measuring portion between the valve body 12 and the valve seat 13 is moved. Open, ie open the valve. When the fluid flows into the inlet 4, the fluid flows into the pressure regulating chamber 17 through the filter 15, the bush 16, the valve hole of the valve seat 13, the valve chamber 14, and the piston flow path 9 b. When the fluid pressure rises in the pressure regulating chamber 17, the piston 9 is pushed down against the biasing force of the spring 21. When the pressure of the fluid in the pressure regulating chamber 17 reaches a predetermined pressure regulation value, the valve body 12 is seated (closed) on the valve seat 13, and the flow of fluid into the valve chamber 14 is stopped. Thereafter, when the fluid flows downstream from the pressure regulating chamber 17, the pressure of the fluid in the pressure regulating chamber 17 decreases, the piston 9 moves upward by the urging force of the spring 21, and the valve body 12 moves away from the valve seat 13. Open the valve. By opening the valve, the fluid flows into the pressure regulating chamber 17 and the pressure in the pressure regulating chamber 17 is recovered.

  Here, in the middle of the inlet-side flow path 5 a upstream of the valve seat 13 in the housing 2, a bush 16 having a rigidity higher than that of the valve seat 13 is provided between the housing 2 (upstream case 5) and the valve seat 13. The filter 15 is fixed via Therefore, even if the valve body 12 is seated (closed) on the valve seat 13 with a strong force, the valve seat 13 is held by the bush 16 having high rigidity and deformation of the valve seat 13 is restricted. For this reason, the filter 15 can be fixed between the valve seat 13 and the housing 2 (upstream side case 5) while suppressing the deformation of the valve seat 13 due to the seating of the valve body 12. That is, in this embodiment, the metal bush 16 functions as a receiver for fixing the filter 15 and preventing the deformation of the valve seat 13.

  In this embodiment, the diameter of the inlet-side flow path 5a is increased in accordance with the passage area of the filter 15 on the upstream side of the filter 15, so that the fluid flows over substantially the entire area of the passage of the filter 15. Almost all of 15 is effectively used as a foreign matter capturing area. For this reason, the foreign substance supplement function by the filter 15 can be exhibited effectively. Further, the bush passage 16a is enlarged in diameter in the vicinity of the downstream side of the filter 15 in accordance with the passage area of the filter 15, and is formed in the vicinity of the valve seat 13 so as to have a smaller diameter than the vicinity of the filter 15. The flow of fluid to is reduced. For this reason, deformation of the valve seat 13 due to the pressure of the fluid acting on the valve seat 13 from the upstream side can be suppressed. Furthermore, since the foreign matter capture area of the filter 15 can be made larger than the passage area (valve hole area) of the valve seat 13, the flow rate of the fluid in the filter 15 can be made lower than the flow rate of the fluid in the valve seat 13. Also in this sense, the foreign matter capturing function by the filter 15 can be effectively exhibited.

  In this embodiment, since the inner diameter D1 of the valve chamber 14 is set to be smaller than the outer diameter D2 of the bush 16 at the portion where the main body case 3 contacts the valve seat 13, the fluid flowing from the inlet 4 into the inlet-side flow path 5a. Is applied to the valve seat 13 via the filter 15 and the bush 16, the deformation of the valve seat 13 is restricted. For this reason, deformation of the valve seat 13 due to the pressure of the fluid acting on the valve seat 13 from the upstream side can be suppressed.

  In this embodiment, since the convex part 16c which protrudes in the direction of the valve seat 13 is formed in the periphery of the outlet 16b in the end surface of the downstream side of the bush 16, the load which the valve seat 13 receives from the valve body 12 is bush 16. Is received by the convex portion 16c. For this reason, the increase of the load which acts on the valve seat 13 by seating of the valve body 12 can be suppressed, and the deformation | transformation of the valve seat 13 can further be suppressed.

  Here, the relationship between the bush 16 and the inlet side case 5 is set such that the bush 16 does not protrude upward in FIG. 1 from the surface 5c of the step portion that supports the valve seat 13 of the inlet side case 5. This is to suppress an increase in load for crushing the valve seat 13. The valve seat 13 is sandwiched between the upstream case 5 and the main body case 3 and crushed, thereby generating a surface pressure on the valve seat 13 and sealing the fluid to the outside and the downstream side. On the other hand, when the bush 16 protrudes from the stepped surface 5c, the area sandwiching the valve seat 13 with the main body case 3 increases, the required load for crushing the valve seat 13 increases, and the pressure resistance decreases. Or the bolts 8 for tightening may increase in size, and the entire pressure reducing valve 1 may increase in size. Therefore, a gap is formed between the valve seat 13 and the bush 16 by setting the bush 16 so as not to protrude from the stepped surface 5c. When a high pressure acts on the bush passage 16a, the valve seat 13 is pushed in the downstream direction, and the valve seat 13 is not deformed even when the valve body 12 is seated on the valve seat 13. However, when the pressure acting on the bush passage 16a is low, there is no possibility that the valve seat 13 is subjected to deformation stress due to a load when the valve body 12 is seated on the valve seat 13. Therefore, in consideration of these points, in the bush 16, the convex portion 16 c is protruded in the direction of the valve seat 13 only in the vicinity of the central portion where the bush passage 16 a is provided, and the valve seat 13 is supported. As a result, a load is received by the bush 16 from the valve body 12 received by the valve seat 13. In this structure, since the convex portion 16c of the bush 16 is a part, the load for crushing the valve seat 13 can be reduced to a minimum.

  In this embodiment, since the gap of the rod sliding portion 11 is throttled by the first wear ring 31 on the upstream side of the first lip seal 22, a high-pressure fluid suddenly flows into the valve chamber 14 from the inlet 4. Even when the pressure (rush pressure) of the fluid is applied to the rod sliding portion 11, the pressure rise at the first lip seal 22 located downstream from the first wear ring 31 is alleviated. Here, the first wear ring 31 has a cut, but both ends of the cut are diagonally cut and face each other. Therefore, when a high-pressure fluid acts on the upstream side (lower side in FIG. 1) from the first wear ring 31, the wear ring 31 is deformed so that the cut is connected and closed, and the fluid from the cut Leakage is also suppressed. That is, the wear ring 31 functions in the labyrinth structure in the rod sliding portion 11 to restrict the fluid flow. For this reason, the breakage of the first lip seal 22 in the rod sliding portion 11 can be prevented, and its sealing function can be ensured. For this reason, leakage of fluid from the pressure reducing valve 1 to the outside can be prevented in advance. For example, when the pressure reducing valve 1 is used in a hydrogen gas supply device, leakage of hydrogen gas from the pressure reducing valve 1 can be prevented in advance.

  Further, in this embodiment, the gap of the piston sliding portion 10 is narrowed by the second wear ring 32 on the downstream side (upper side in FIG. 1) from the second lip seal 23, so that the pressure adjusting chamber 17 has a high pressure. Even if the fluid suddenly flows in and the pressure of the fluid is applied to the piston sliding portion 10 (inrush pressure), the second lip located on the upstream side (lower side in FIG. 1) from the second wear ring 32 The pressure increase at the seal 23 is alleviated. For this reason, the breakage of the second lip seal 23 in the piston sliding portion 10 can be prevented, and its sealing function can be ensured. Also in this sense, fluid leakage from the pressure reducing valve 1 to the outside can be prevented in advance.

  In addition, this invention is not limited to the said embodiment, A part of structure can also be changed suitably and implemented in the range which does not deviate from the meaning of invention.

(1) In the above-described embodiment, the bush 16 disposed between the valve seat 13 and the filter 15 is configured as a single part. However, as shown in a partial cross-sectional view in FIG. 27 can also be configured.
(2) In the above embodiment, the convex portion 16c formed on the end face of the bush 16 is formed in an annular shape, but the convex portion can also be formed radially around the outlet.

  The present invention can be used in a fluid supply apparatus for supplying a high-pressure fluid such as high-pressure gas under reduced pressure. For example, it can be used in a hydrogen supply device for supplying hydrogen gas to a fuel cell.

DESCRIPTION OF SYMBOLS 1 Pressure reducing valve 2 Housing 3 Main body case 4 Inlet 5 Inlet side case 5a Inlet side flow path 6 Outlet 9 Piston 9a Rod 9b Piston flow path 12 Valve body 13 Valve seat 15 Filter 16 Bush 16a Bush flow path 16b Outlet 16c Convex part 17 Pressure chamber 21 Spring

Claims (4)

A housing;
An inlet and an outlet provided at one end and the other end in the axial direction of the housing;
A piston provided to be movable in the axial direction in the housing;
A rod extending axially from the piston toward the inlet;
A valve body provided at the tip of the rod;
The valve body is provided so as to be seated in the housing, and a valve seat formed as a separate member from the housing
A valve chamber formed around the valve body on the downstream side of the valve seat;
A pressure regulating chamber provided between the housing and the downstream side of the piston;
A piston flow path provided in the rod and the piston for flowing fluid from the valve chamber to the pressure regulating chamber;
A spring that urges the piston and the rod in a direction in which the valve body separates from the valve seat;
The housing includes an inlet-side flow path provided between the valve seat and the inlet, and fluid introduced from the inlet is allowed to flow between the inlet-side flow path, the valve body, and the valve seat. In the pressure reducing valve, the pressure is reduced by the balance between the pressure of the fluid in the pressure adjusting chamber and the biasing force of the spring and is led out from the outlet through the piston flow path.
A filter that is disposed in the inlet-side flow path upstream of the valve seat in the housing and captures foreign matter in the fluid;
A bushing disposed between the filter and the valve seat to secure the filter in the housing;
The bush is formed of a material having higher rigidity than the valve seat. The inlet side flow path is enlarged in accordance with the passage area of the filter on the upstream side of the filter,
The bush includes a bush flow path at the center thereof, and the bush flow path is enlarged in the vicinity of the downstream side of the filter in accordance with the passage area of the filter, and near the valve seat from the vicinity of the filter. The pressure reducing valve according to claim 1, wherein the pressure reducing valve has a small diameter. The housing includes a main body case that houses the piston, the rod, the valve body, and the spring, and an inlet side case that includes the inlet,
The outer peripheral edge of the valve seat is sandwiched between the main body case and the inlet side case,
2. The pressure reducing valve according to claim 1, wherein an inner diameter of the valve chamber is set to be smaller than an outer diameter of the bush at a portion where the main body case is in contact with the valve seat.   The bush includes an end surface in contact with the valve seat on the downstream side thereof, and an outlet of the bush passage is formed on the end surface, and a convex portion protruding in the direction of the valve seat is formed on the periphery of the outlet. The pressure reducing valve according to claim 2.

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