JP2020009311A - Pressure reduction valve - Google Patents

Abstract

To provide a pressure reduction valve that is easy to assemble.SOLUTION: A pressure reduction valve has: a valve seat member 31 disposed in a recessed part 23 of a housing 2 and provided with a through-hole 37; a rod 32 having a valve body part 322 inserted in the through-hole 37 and capable of adjusting a degree of valve opening, which is an empty space left from the through-hole 37; a diaphragm 33 connected to the rod 32; a pressure adjustment spring 4 one end of which abuts on a diaphragm 33; and a pressing member 5 abutting on the other end of the pressure adjustment spring 4. The pressure reduction valve comprises a helical engagement member 6 that is helically engaged with the housing 2, and the valve seat member 31 and the pressing member 5 are fixed to the housing 2 by the helical member 6. The valve body part 322 closes the through-hole 37 and consequently one side and the other side of the valve seat member 31 are sectioned as a primary pressure space R1 and a secondary pressure space R2.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a pressure reducing valve that adjusts a secondary pressure on an outflow side.

  The water supply pipe in the warm water flush toilet seat device is provided with a pressure reducing valve that adjusts the outflow-side secondary pressure so that the supply water pressure supplied to the downstream side is always constant. For example, a pressure reducing valve used in a water supply pipe disclosed in Patent Literature 1 includes a housing in which a fluid inlet side and a fluid outlet side are defined by walls, and the wall has an inlet side and an outlet side. A through-hole communicating with the side is provided, a rod is inserted into the through-hole from the inlet side of the housing, and a valve body portion capable of closing the through-hole is provided on the inlet side of the rod. ing. On the outlet side of the housing, a diaphragm is arranged so as to divide a space in a direction perpendicular to the rod, and the insertion side end of the rod is connected to the diaphragm, and the diaphragm is urged to the rod side by a pressure regulating spring. Have been. When the space on the outlet side of the housing has a high pressure, the diaphragm is deformed against the urging force of the pressure adjusting spring, the rod moves accordingly, and the opening of the through hole decreases due to the valve body. Thus, the flow rate of the fluid is reduced, and the pressure of the fluid flowing out is reduced.

  There is also a pressure reducing valve disclosed in Patent Document 2 as a pressure reducing valve used for natural gas. In this pressure reducing valve, a recess is provided in the housing, a valve seat member separate from the housing is prepared, and a rod is inserted from one side into an opening of the valve seat member, and the rod is inserted into an end of the rod on the insertion side. The diaphragm is connected to form a valve operation unit. The valve operation unit is disposed in a recess of the housing, and the cover member is fixed to the housing at a plurality of positions with bolts interposed between the diaphragm and the cover member.

JP 2007-148465 A (Page 6, FIG. 1) JP-A-2005-227860 (page 8, FIG. 8)

  In the pressure reducing valve as disclosed in Patent Literature 1, since the periphery of the through hole in the wall of the housing functions as a valve seat of the valve body, an opening for attaching a rod and an opening for attaching a diaphragm. Are formed on both sides of the wall of the housing, and lid members for closing the respective openings need to be prepared, which has a problem that the structure becomes complicated.

  In the pressure reducing valve of Patent Document 2, since a valve seat member separate from the housing is prepared, the valve operation unit, the pressure regulating spring, and the lid member may be arranged in this order with respect to the recess of the housing. The valve operating unit is provided on the male screw portion provided on the outer peripheral surface of the valve seat member and the concave inner peripheral surface of the housing. (Fixing the valve operation unit) by screwing the female screw portion into a recessed portion, and connecting the housing and the lid member with a plurality of bolts while pressing the pressure adjusting spring with the lid member ( And fixing the pressure adjusting spring), and the fixing work is large, and the assembling work of the pressure reducing valve is complicated.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a pressure reducing valve which is easy to assemble.

In order to solve the above problems, the pressure reducing valve of the present invention is
A valve seat member provided in a recess of the housing and provided with a through-hole, a rod having a valve body inserted through the through-hole and capable of adjusting a valve opening which is a gap between the valve and the rod; A diaphragm to be connected, a pressure regulating spring having one end contacting the diaphragm, and a pressing member contacting the other end of the pressure regulating spring;
The valve seat member is fixed to the housing by the screw member, and the valve body closes the through-hole so that the valve seat member is closed. Is divided into a primary pressure space and a secondary pressure space, respectively.
According to this feature, the components of the pressure reducing valve can be fixed to the housing by screwing and fixing the screwing member to the housing, so that the pressure reducing valve can be easily assembled.

Preferably, the screw member presses the valve seat member against the inner surface of the recess of the housing via the pressing member.
According to this, the valve seat member is pressed and fixed to the inner surface of the concave portion of the housing by the pressing member only by the screwing operation of the screwing member. Since the member is pressed against the inner surface of the recess of the housing by the pressing member, the pressure reducing valve can be easily assembled. Further, since the valve seat member and the holding member can be fixed to the housing without using a member for fixing the holding member, the whole can be formed to be small.

Preferably, a seal member is provided between the valve seat member and the housing to partition the primary pressure space and the secondary pressure space.
According to this, fluid leakage between the primary pressure space and the secondary pressure space can be prevented.

Preferably, a peripheral portion of the diaphragm is tightly held between the valve seat member and the pressing member.
According to this, since the diaphragm can be fixed in a sealed state using the valve seat member and the holding member, the diaphragm does not have to be fixed to the valve seat member using packing and screws or fixed by welding, and the diaphragm can be fixed. It can be easily installed.

Preferably, the valve seat member is provided with a communication hole that communicates the secondary pressure space with an outlet provided in the housing.
According to this, a flow path that connects the secondary pressure space and the outlet can be simply configured.

Preferably, the female screw part on the inner periphery of the screw member is screwed with the male screw part on the outer periphery of the housing.
According to this, the housing can be made compact.

Preferably, the valve seat member has an engaged portion that engages with an engaging portion provided in the recess of the housing.
According to this, the circumferential positioning of the valve seat member with respect to the recess of the housing can be performed by the engagement between the engaging portion and the engaged portion.

It is a perspective view showing the pressure reducing valve in Example 1 of the present invention. FIG. 2 is an exploded perspective view illustrating the pressure reducing valve according to the first embodiment. It is AA sectional drawing of FIG. (A) is a longitudinal sectional view along the axial direction of the inflow pipe section, and (b) is a longitudinal sectional view along the axial direction of the outflow pipe section. It is a bottom view showing a housing. (A) is a perspective view of the inner plate viewed from above, and (b) is a perspective view of the inner plate viewed from below. It is a perspective view of a valve operation unit. It is BB sectional drawing of FIG. (A) is a longitudinal sectional view showing a state where the inner plate is fixed to the housing, (b) is a longitudinal sectional view showing a state where the valve operation unit is arranged in the housing from the state shown in (a), and (c) is a pressure regulation. FIG. 4 is a longitudinal sectional view showing a state in which a spring, a holding member, and a screwing member are fixed to a housing. It is CC sectional drawing of FIG.9 (b). It is a perspective view showing the pressure reducing valve in Example 2 of the present invention.

  Embodiments for implementing a pressure reducing valve according to the present invention will be described below based on embodiments.

  First Embodiment A pressure reducing valve according to a first embodiment will be described with reference to FIGS.

  FIG. 1 shows a pressure reducing valve 1 according to a first embodiment of the present invention. This pressure reducing valve 1 is provided in a water supply pipe in a hot water flush toilet seat device. In the first embodiment, a strainer, a check valve, a water stop valve 7, a pressure reducing valve 1, a heat exchanger, a flow control valve, a nozzle, and the like are arranged in the water supply pipe from the upstream side. The pressure is adjusted so that the fluctuating water pressure of the water supplied from the pipe is constant. The pressure reducing valve 1 is provided with an inflow port 21 to which water is supplied from the upstream side, and an outflow port 22 to flow out regulated water to the downstream side. ing.

  As shown in FIGS. 2 and 3, the pressure reducing valve 1 mainly includes a housing 2, a valve operation unit 3, a pressure adjusting spring 4, a holding member 5, and a screwing member 6. .

  First, the configuration of the housing 2 will be described. The housing 2 includes an inflow pipe portion 2A having an inflow port 21 therein, an outflow pipe portion 2B having an outflow port 22 therein, and a concave portion 23 forming a substantially cylindrical space which can be inserted into the valve operation unit 3 and opens downward. And a base 2C to be formed.

  FIG. 4A is a longitudinal sectional view along the axial direction of the inflow pipe portion 2A. The housing 2 has a flow path 2a extending from the inflow port 21 in the horizontal direction. The portion is formed with a concave portion 2b opening upward. A channel 2c extending in the vertical direction is formed below the concave portion 2b, and the lower end of the channel 2c communicates with the recess 23.

  The water stop valve 7 is a solenoid valve having a valve portion 7a that can be operated in the vertical direction. The water stop valve 7 is connected to the upper portion of the concave portion 2b of the housing 2 by a screw N1 in a sealed state, and the valve portion 7a is in the concave portion 2b. By operating up and down, the open state and the closed state of the flow path 2a and the flow path 2c can be switched (see FIGS. 2 and 3).

  FIG. 4B is a longitudinal sectional view along the axial direction of the outflow pipe portion 2B. In the housing 2, a flow path 2d extending vertically from an end of the horizontally extending outflow port 22 is formed. The lower end of the flow path 2 d communicates with the recess 23. That is, the inflow port 21 and the outflow port 22 communicate with each other through the flow paths 2a, 2c, and 2d, the recess 2b, and the recess 23. An annular groove 23c is formed on the upper surface 23b of the recess 23 (the bottom surface of the recess 23) so as to surround the periphery of the opening of the flow path 2d. A male screw portion 26 is formed on the outer peripheral surface on the lower end side of the base portion 2C in the housing 2.

  As shown in FIG. 5, on one side (left side of the paper surface) of the inner peripheral surface 23 a of the concave portion 23 from the central axis, a vertically long ridge projecting inward and rightward from the inner peripheral surface 23 a of the concave portion 23. The portions 24, 24 (engaging portions) are arranged in parallel and in parallel, and on the other side (right side of the paper) of the inner peripheral surface 23a of the concave portion 23 from the central axis, the inner side from the inner peripheral surface 23a of the concave portion 23. In addition, vertically long ridges 25, 25 (engaging portions) protruding in the front-rear direction are arranged to face each other.

  Referring to FIG. 3, inner plate 8 is fixed to upper surface 23 b of recess 23. Specifically, as shown in FIG. 6, the inner plate 8 is a plate member having a T-shape in a plan view having a base portion 81 and a projecting portion 82 projecting rearward from the base portion 81. A hole 8a penetrating in the thickness direction is provided in 82. Around the hole 8a on the upper surface of the inner plate 8, an annular protrusion 8b fitted to the groove 23c (FIG. 4B) is formed, and the vicinity of the hole 8a on the lower surface of the inner plate 8 (the base 81 side). ) Is formed with an annular concave portion 8c that opens downward, and the hole 8a and the annular concave portion 8c communicate with each other through a connection groove 8d having a bottom. A seal groove 8e is formed on the lower surface of the inner plate 8 so as to surround the hole 8a, the annular recess 8c, and the connection groove 8d, and the seal groove 8e has an annular seal member 9 (see FIG. 2 and FIG. 2). 3 (see FIG. 3).

  The inner plate 8 is fixed to the housing 2 by welding with the annular projection 8b fitted into a groove 23c formed on the upper surface 23b of the concave portion 23. In this state, the hole 8a of the inner plate 8 is The two flow paths 2d communicate with each other (see FIG. 3). That is, the inner plate 8 forms a part of the housing 2.

  In the inner plate 8, the annular protrusion 8b is fitted into the groove 23c, the left side surface 81a of the base 81 is brought into contact with the end surface 24a of the protrusions 24, 24, and the protrusion 82 is formed by the protrusions 25, 24. 25, the inner plate 8 can be accurately arranged with respect to the concave portion 23 and can be welded in that state, so that the assembly and welding work of the housing 2 and the inner plate 8 is simple (see FIG. 5). (See the two-dot chain line).

  Next, the valve operation unit 3 will be described. As shown in FIGS. 7 and 8, the valve operation unit 3 mainly includes a body 31 (valve seat member), a rod 32, and a diaphragm 33. The body 31 has a concave portion 34 formed on the upper side and a concave portion 35 formed on the lower side. The communication passage 31a (communication hole) communicates the upper concave portion 34 to the outside, and the communication passage 31a communicates the lower concave portion 35 to the outside. A channel 31b (communication hole) is formed. A vertically extending through hole 37 is formed in a partition wall portion 36 extending left and right that defines the concave portions 34 and 35 in the body 31. The concave portion 34 and the concave portion 35 communicate with each other through the through hole 37.

  A concave groove 31c that is concave in the inner diameter direction is formed on the outer peripheral surface of the body 31, and an O-ring 38 is fitted and disposed in the concave groove 31c. In addition, an extension portion 31A (engaged portion) is formed in the upper part of the body 31 such that the peripheral portions of the communication flow paths 31a and 31b and the through hole 37 extend above other portions. In other words, the upper portion of the body 31 has a cutout shape with the extension portion 31A remaining, and two projecting ridge portions 39, 39 (engaged portions) are directed upward from the cutout portion. Joint portion) is provided to extend. On the lower surface of the body 31, an annular concave groove portion 31d that opens downward so as to surround the periphery of the concave portion 35 is formed.

  The rod 32 has a columnar shape, extends in the up-down direction, is inserted into the through hole 37 from the concave portion 34 side, and has a lower end portion disposed in the concave portion 35 and an upper end portion disposed in the concave portion 34. . The rod 32 is provided with a valve body 322 having a tapered surface 321 that tapers downward, and the upper portion of the valve body 322 has a larger diameter than the through hole 37. The valve body portion 322 is configured such that the tapered surface 321 comes into contact with the partition wall portion 36 forming the through hole 37 when the rod 32 descends, and opens and closes the through hole 37. That is, the partition wall portion 36 functions as a valve seat of the valve body portion 322, and the tapered surface 321 adjusts the valve opening, which is a gap between the partition wall portion 322 and the partition wall portion 322. A seal ring 323 is externally fitted above the valve body 322 of the rod 32. The seal ring 323 is locked by a step 34 a provided below the recess 34. An annular groove 324 is formed in the lower end of the rod 32 in the circumferential direction, and an annular protrusion 325 is formed at a position spaced above the groove 324.

  The diaphragm 33 is a disk-shaped member made of a rubber member, and is attached to a lower end of the rod 32. Specifically, the lower end of the rod 32 is inserted into a through hole 33 a provided at the center of the diaphragm 33, and the ring-shaped retainer 10 is disposed between the diaphragm 33 and the protrusion 325 of the rod 32. The ring-shaped retainer 11 is fitted into the groove 324 of the rod 32. That is, the diaphragm 33 is fixed by being sandwiched from above and below by the retainers 10 and 11 fixed to the rod 32. In addition, a sealing portion 33 b that is elastically deformed is formed on a peripheral portion of the diaphragm 33, and is disposed in the concave groove portion 31 d of the body 31.

  Returning to FIG. 3, the pressure adjusting spring 4 is a pressing spring, and is disposed between the diaphragm 33 and the pressing member 5 via the retainer 11 (see FIG. 8). The urging force is given. The holding member 5 includes a bottomed tubular portion 5a having a U-shaped cross section and a flange portion 5b projecting outward from the open end of the bottomed tubular portion 5a. The pressure adjusting spring 4 is housed in the cylindrical portion 5a. An annular convex portion 5c slightly protruding upward is formed on the flange portion 5b. The screwing member 6 has a bottomed cylindrical shape having a U-shaped cross section and a bottom portion 6b of the screwing member 6 is formed with a through hole 6d vertically penetrating therethrough. A female screw portion 6e that can be screwed into the male screw portion 26 of the housing 2 is formed on the peripheral wall portion 6c of the housing 6.

  In a state where the pressure reducing valve 1 is assembled, a space between the body 31 and the concave portion 23 of the housing 2 is a primary pressure space R1, and a space between the concave portion 35 of the body 31 and the diaphragm 33. Is a secondary pressure space R2. The inflow port 21, the flow paths 2a and 2c, and the recess 2b communicate with the upstream side of the primary pressure space R1, and the communication flow path 31a and the recess 34 communicate with the downstream side of the primary pressure space R1. are doing. The upstream side of the secondary pressure space R2 communicates with the recess 34 through the through hole 37 of the body 31, and the downstream side of the secondary pressure space R2 communicates with the communication channel 31b, the hole 8a, and the channel 2d. , And the outflow port 22 communicates.

  When the pressure in the secondary pressure space R2 becomes high, the diaphragm 33 is deformed against the urging force of the pressure adjusting spring 4, and accordingly, the rod 32 moves downward, and the tapered surface 321 of the valve body 322 is moved downward. The gap with the partition wall 36 is reduced, the flow rate of water is reduced, and the pressure of the water flowing out of the outflow port 22 is reduced. In addition, a part of the decompressed water flows from the hole 8a of the inner plate 8 through the connecting groove 8d into the annular concave portion 8c, and the valve body 322 pushes the rod 32 in the direction of increasing the opening degree of the through hole 37. Since it is used as a moving back pressure, the operation of the valve operation unit 3 is stabilized.

  Next, a procedure for assembling the pressure reducing valve 1 will be described. As shown in FIG. 9A, first, the inner plate 8 is welded to the housing 2 and fixed. Thereafter, the seal member 9 is fitted into the seal groove 8e of the inner plate 8. When the inner plate 8 is fixed to the housing 2, the flow path 2 d of the housing 2 communicates with the hole 8 a of the inner plate 8.

  Next, as shown in FIG. 9B, the valve operating unit 3 in which the body 31, the rod 32, and the diaphragm 33 are integrally assembled is inserted into the concave portion 23 of the housing 2. When the valve operation unit 3 is inserted into the recess 23 of the housing 2, the hole 8 a of the inner plate 8 communicates with the communication channel 31 b of the body 31, and the annular recess 8 c of the inner plate 8 A part of the upper end of the rod 32 is disposed in the annular recess 8c. Further, since the concave portion 34 of the body 31 is closed by the inner plate 8, the seal ring 323 externally fitted to the rod 32 is prevented from being detached from the inside of the concave portion 34. The O-ring 38 disposed on the outer peripheral surface (the concave groove portion 31c) of the body 31 is pressed against the inner peripheral surface 23a of the concave portion 23.

  At this time, as shown in FIG. 10, the ridges 24, 24 provided on the inner peripheral surface 23 a of the recess 23 are disposed between the ridges 39, 39 of the body 31, and Since the extension 31A is arranged between the ridges 25, 25, the valve operation unit 3 is positioned in the circumferential direction. When the valve operation unit 3 is inserted into the concave portion 23 of the housing 2, the protruding portions 39, 39 of the body 31 slide on the protruding portions 24, 24 of the concave portion 23, and the extending portion 31 A of the body 31 protrudes. Since the valve operation unit 3 slides along the ridges 25, 25, the valve operation unit 3 can be inserted into the recess 23 of the housing 2 while positioning the valve operation unit 3 in the circumferential direction, and this operation is simplified. In this embodiment, the valve operation unit 3 is entirely disposed in the recess 23. However, if at least a part of the valve operation unit 3 is disposed in the recess 23, the valve operation unit 3 is partially disposed in the recess 23. From the outside.

  Next, as shown in FIG. 9C, in a state where the pressure adjusting spring 4 is arranged between the diaphragm 33 and the pressing member 5, the flange portion 5b of the pressing member 5 is pressed against the body 31 and the pressing member is pressed. The screwed member 6 is screw-connected to the housing 2 in a state where the bottomed cylindrical portion 5 a of 5 is passed through the through hole 6 d of the screwed member 6. As a result, the flange portion 5b of the holding member 5 is pressed against the body 31 by the bottom portion 6b of the screw member 6, whereby the body 31 is held between the flange portion 5b of the holding member 5 and the inner plate 8, and the housing 2 Of the body 31 with respect to the vertical direction. At this time, the seal portion 33b provided on the peripheral edge of the diaphragm 33 is narrowed by the body 31 (the concave groove portion 31d) and the pressing member 5 (the annular convex portion 5c), so that the body 31 and the pressing member 5 are sealed. Connected to state.

  As described above, the body 31, the rod 32, and the diaphragm 33 are arranged in the recess 23 of the housing 2 in a unitized state as the valve operation unit 3, and the pressure adjusting spring 4 is provided between the body 31, the rod 32, and the diaphragm 33. In a state where the pressing member 5 is fixed to the housing 2 in the arranged state, and the pressing member 5 is fixed to the housing 2, the body 31 is pressed against the upper surface 23 b (the inner plate 8) of the concave portion 23 of the housing 2 by the pressing member 5. A secondary pressure space R2 is formed between the body 31 and the diaphragm 33.

  According to this, if the operation of fixing the pressing member 5 to the housing 2 in a state where the pressure adjusting spring 4 is disposed between the pressing member 5 and the diaphragm 33 is performed, the positioning operation of the valve operation unit 3 with respect to the housing 2 is performed at the same time. Since the operation is completed, the operation of fixing the valve operation unit 3 and the operation of fixing the pressure adjusting spring 4 do not have to be performed separately. Further, the valve operation unit 3 in which the body 31, the rod 32, and the diaphragm 33 are integrally assembled is housed. Since the pressure reducing valve 1 can be disposed in the second concave portion 23, the pressure reducing valve 1 can be easily assembled.

  In addition, a seal member 9 that partitions the primary pressure space R1 and the secondary pressure space R2 is provided between the body 31 and the housing 2. Specifically, when the pressure reducing valve 1 is assembled, an annular seal member 9 is sandwiched between the body 31 and the inner plate 8 constituting the housing 2, and the seal member 9 is The primary pressure space R1 is partitioned from the hole 8a and the flow path 2d communicating with the space R2. According to this, water leakage between the primary pressure space R1 and the secondary pressure space R2 can be prevented, and the seal member 9 is sandwiched between the body 31 and the inner plate 8, so that the sealing performance is improved. And the installation of the seal member 9 is simple.

  Further, a seal portion 33b on the peripheral edge of the diaphragm 33 is tightly held between the concave groove portion 31d of the body 31 and the annular convex portion 5c of the pressing member 5. That is, since the diaphragm 33 can be fixed using the body 31 and the pressing member 5, the diaphragm 33 can be fixed to the body 31 and fixed by using a screw or by welding, and the diaphragm 33 can be easily installed. Further, since the pressing force is concentrated on the annular convex portion 5c, the body 31 can be firmly held between the pressing member 5 and the housing 2, and the seal portion 33b of the diaphragm 33 is moved between the annular convex portion 5c and the body 31. The pressure is narrowed by a strong force, and the sealing property between the holding member 5 and the body 31 is improved.

  The body 31 is provided with a communication passage 31a (communication hole) that connects the primary pressure space R1 and the concave portion 34. According to this, a flow path communicating the primary pressure space R1 and the concave portion 34 which is a space around the rod communicating with the through hole 37 can be simply configured without forming a complicated flow path.

  The body 31 is provided with a communication passage 31b (communication hole) that communicates the secondary pressure space R2 with the outflow port 22 provided in the housing 2. According to this, the flow path between the secondary pressure space R2 and the outflow port 22 can be simply configured without forming a complicated flow path in the rod 32, the housing 2, and the like. In addition, since the communication channel 31a that communicates the primary pressure space R1 and the secondary pressure space R2 is also provided in the body 31, if the communication channels 31a and 31b are defective, the body 31 is replaced. Maintenance is easy.

  In addition, a screw member 6 that is screwed to the housing 2 is provided, and the pressing member 5 is pressed by the screw member 6 toward the body 31. According to this, since the fixing of the pressing member 5 to the housing 2 is completed by a single screwing operation of the screwing member 6, the pressure is reduced compared to fixing the pressing member 5 to the housing 2 with a plurality of bolts. The assembly work of the valve 1 is simple. Further, the force in the rotation direction generated when the screwing member 6 is screwed can be prevented from being applied to the pressure adjusting spring 4 and the valve operating unit 3, and the pressure adjusting spring 4 and the valve operating unit 3 can be accurately attached to the housing 2. be able to.

  Further, the screw member 6 is screwed to the outer peripheral surface of the housing 2 from outside. Specifically, a male screw portion 26 is formed on the outer peripheral surface of the housing 2, and a female screw portion 6 e is formed on the inner peripheral surface of the screw member 6. It is screwed from the outside. According to this, the screw portion for connecting the screw member 6 does not need to be formed on the inner surface of the concave portion 23 of the housing 2 and the concave portion 23 can be widely used, so that the housing 2 can be made compact. it can.

  Further, the body 31 is formed with a ridge portion 39 and an extension portion 31A that engage with the ridge portions 24 and 25 provided in the concave portion 23 of the housing 2. Specifically, the ridges 24, 24 are disposed between the ridges 39, 39, and the extension 31A of the body 31 is disposed between the ridges 25, 25. Since positioning in the circumferential direction is performed, the valve operation unit 3 can be reliably operated.

  Next, a pressure reducing valve according to a second embodiment will be described with reference to FIG. It should be noted that the description of the same configuration as that of the above-described embodiment and a duplicate configuration will be omitted.

  As shown in FIG. 11, the pressing member 50 of the pressure reducing valve 100 in the second embodiment is formed with an annular concave portion 50c having an L-shaped cross section in which a peripheral edge on the opening side of the flange portion 50b is cut out. The body 310 has an annular convex portion 311 that can be inserted into the annular concave portion 50c. In a state where the pressure reducing valve 100 is assembled, the seal portion 33 b on the peripheral portion of the diaphragm 33 is pressed by the annular concave portion 50 c and the annular convex portion 311. According to this, since the pressing force is concentrated on the annular convex portion 311, the body 310 can be firmly held between the holding member 50 and the housing 2, and the seal portion 33 b of the diaphragm 33 is in contact with the annular convex portion 311 of the body 310. A narrow pressure is applied between the holding member 50 and the annular concave portion 50c by a strong force, and the sealing between the holding member 50 and the body 31 is improved.

  As described above, the embodiments of the present invention have been described with reference to the drawings. However, the specific configuration is not limited to these embodiments, and even if there are changes and additions without departing from the gist of the present invention, they are included in the present invention. It is.

  For example, in the above-described embodiment, the form in which the pressing member 5 and the screwing member 6 are formed separately is illustrated, but the present invention is not limited to this, and the pressing member 5 and the screwing member 6 may be integrally formed. Good. In the above-described embodiment, the valve operation unit 3 is pressed against the inner surface of the concave portion 23 when the screw member 6 is screwed and fixed to the housing 2, but the valve operation unit 3 is pressed against the screw member 6. The valve operating unit 3 may be arranged in the recess 23 when the screw member 6 is fixed to the housing 2 by screwing.

  Further, in the above-described embodiment, the form in which the sealing portion 33b of the peripheral portion of the diaphragm 33 is sandwiched between the body 31 and the pressing member 5 in a sealed state is illustrated, but the peripheral portion of the diaphragm 33 is attached to the body 31. It may be fixed by welding or screws. In this case, a secondary pressure space can be formed even if the peripheral edge of the diaphragm 33 is not pinched between the body 31 and the holding member 5.

  In the embodiment, an annular convex portion is provided on one of the pressing member or the valve seat member, and an annular concave portion is provided on the other of the pressing member or the valve seat member, and a peripheral portion of the diaphragm is provided between the annular convex portion and the annular concave portion. Is illustrated, but the holding member and the valve seat member may be formed flat as long as the periphery of the diaphragm is held in a sealed state between the holding member and the valve seat member. . Further, when the diaphragm peripheral portion is fixed to the valve seat member in a sealed state, a plurality of convex portions may be provided on the pressing member or the valve seat member in the circumferential direction.

  Further, in the above-described embodiment, the form in which the communication flow path 31b communicating the secondary pressure space and the outflow port 22 is provided in the body 31 of the valve operation unit 3 is exemplified. However, the present invention is not limited to this. A hole may be formed to penetrate the secondary pressure space and the outflow port 22 through the hole.

  In the above embodiment, the screw member 6 is screwed into the housing 2 from the outside. However, the present embodiment is not limited to this. A male screw portion may be provided on the outer peripheral surface of the screw member 6, and the screw member 6 may be screw-connected to the inside of the housing 2. Further, the holding member 5 may be fixed to the housing 2 by a fastening member such as a bolt.

  Further, in the above-described embodiment, the form in which the ridge 39 and the extension 31A of the body 31 are engaged with the ridges 24 and 25 of the housing 2 is illustrated, but the present invention is not limited to this. It is only necessary that the body 31 and the concave portion 23 of the housing 2 are fitted into the concave and convex portions. For example, a concave groove may be provided on the inner peripheral surface 23 a of the concave portion 23 of the housing 2, and a protrusion that can be fitted into the concave groove may be provided on the outer peripheral surface of the body 31.

REFERENCE SIGNS LIST 1 pressure reducing valve 2 housing 3 valve operation unit 4 pressure adjusting spring 5 pressing member 6 screwing member 6 e female screw portion 8 inner plate 9 sealing member 21 inflow port (inlet)
22 Outflow port (outflow port)
23 recess 23b upper surface (inner surface)
24, 25 ridge (engaging part)
26 Male thread part 31 Body (valve seat member)
31A Extension (engaged part)
31b Communication channel (communication hole)
32 rod 33 diaphragm 33b seal portion 35 recess 37 through hole 39 ridge (engaged portion)
50 Holding member 100 Pressure reducing valve 322 Valve body part R1 Primary pressure space R2 Secondary pressure space

Claims (7)

A valve seat member provided in a recess of the housing and provided with a through-hole, a rod having a valve body inserted through the through-hole and capable of adjusting a valve opening which is a gap between the valve and the rod; A diaphragm to be connected, a pressure regulating spring having one end contacting the diaphragm, and a pressing member contacting the other end of the pressure regulating spring;
The valve seat member is fixed to the housing by the screw member, and the valve body closes the through-hole so that the valve seat member is closed. The pressure reducing valve is characterized in that one side and the other side are divided into a primary pressure space and a secondary pressure space, respectively.   The pressure reducing valve according to claim 1, wherein the screw member presses the valve seat member against the inner surface of the recess of the housing via the pressing member.   3. The pressure reducing valve according to claim 1, wherein a seal member that partitions the primary pressure space and the secondary pressure space is provided between the valve seat member and the housing. 4.   The pressure reducing valve according to any one of claims 1 to 3, wherein a peripheral portion of the diaphragm is sandwiched between the valve seat member and the pressing member in a sealed state.   The pressure reducing valve according to any one of claims 1 to 4, wherein the valve seat member is provided with a communication hole that communicates the secondary pressure space with an outlet provided in the housing.   The pressure reducing valve according to any one of claims 1 to 5, wherein the female screw part on the inner periphery of the screw member is screwed with the male screw part on the outer periphery of the housing.   The pressure reducing valve according to any one of claims 1 to 6, wherein the valve seat member has an engaged portion that engages with an engaging portion provided in the recess of the housing.

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