JP2007323599A - Pressure reducing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure reducing valve capable of preventing the deformation of a fringe of a spring case even if the fringe of the spring case receives high pressure for a long time from a pressure-sensitive chamber side through a diaphragm, and preventing the loosening of a caulking bonding part between a diaphragm case fringe and the spring case fringe, and having no possibility of the occurrence of a liquid leak from the fringe. <P>SOLUTION: This valve is equipped with the spring case 113 for sandwiching the outer fringe of the diaphragm by cooperation between the outer fringe and the outer fringe of the diaphragm case 110. The outer fringe of the diaphragm case is bonded by caulking to the outer fringe of the spring case. The valve is also equipped with a reinforcing member 118 mounted detachably to the diaphragm case and the spring case for preventing the deformation of the spring case outer fringe by sandwiching a portion furthermore inside in the radial direction than the caulking bonding part of the diaphragm case outer fringe and a portion furthermore inside in the radial direction than the caulking bonding part of the spring case outer fringe. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a pressure reducing valve.

A cylinder, a piston head that reciprocates in the cylinder, a first piston rod that extends from one end face of the piston head and protrudes from one end of the cylinder to the outside of the cylinder, and a cylindrical valve seat formed at the one end of the cylinder A valve body fixed to one end of the first piston rod protruding from the cylinder and facing the valve seat, a valve inlet formed in a portion of the cylinder peripheral wall facing the first piston rod, and extending from the cylinder head A second piston rod projecting from the other end of the cylinder to the outside of the cylinder, a diaphragm having a central portion fixed to one end projecting from the other end of the cylinder of the second piston rod, and a diaphragm, a cylinder, and a piston head facing the diaphragm Diaphragm case that cooperates to form a pressure sensitive chamber, and from one end of the cylinder to the other end formed on the cylinder peripheral wall A pressure introducing hole for guiding the secondary pressure to the pressure sensing chamber, a spring for pressing the diaphragm toward the pressure sensing chamber, and the outer peripheral edge portion of the diaphragm case in cooperation with the outer peripheral edge portion of the diaphragm case. Patent Document 1 discloses a pressure reducing valve that includes a spring case that sandwiches an outer peripheral edge portion.

In the pressure reducing valve, the liquid flowing into the cylinder through the valve inlet flows toward the valve seat through the cylinder, and flows out of the cylinder through the annular gap between the valve seat and the valve body. As the liquid passes through the annular gap between the valve seat and the valve body, a pressure loss occurs and the liquid is depressurized.
When the liquid downstream of the annular gap flows into the pressure sensing chamber through the pressure introducing hole, the secondary pressure of the pressure reducing valve, which is the liquid pressure downstream of the annular gap, is applied to the diaphragm. The primary pressure of the pressure reducing valve, which is the liquid pressure upstream of the annular gap, is not transmitted to the pressure sensing chamber and is not applied to the diaphragm if the sliding contact portion between the piston head and the cylinder is sealed.
When the secondary pressure rises for some reason, the diaphragm elastically deforms away from the valve seat against the urging force of the spring, and the second piston rod fixed to the diaphragm, the piston head, and the first piston rod are the diaphragm. Following this, it moves to the diaphragm side, and the valve body approaches the valve seat. As a result, the annular gap between the valve seat and the valve body is narrowed, the pressure loss when the liquid passes through the annular gap increases, and the secondary pressure drops. Therefore, in the pressure reducing valve, the secondary pressure is maintained below a predetermined value.
JP 2000-205425 A

In the conventional pressure reducing valve, foreign matter in the pipe such as iron rust is sandwiched between the valve seat and the valve body, and the annular gap between the valve seat and the valve body remains widened. When the pressure-sensitive chamber pressure becomes high over a long period of time, the outer peripheral edge of the spring case that holds the outer peripheral edge of the diaphragm in cooperation with the outer peripheral edge of the diaphragm case is pressure-sensitive through the diaphragm. Due to the high pressure from the chamber side for a long time, it deforms due to the high pressure from the outer periphery of the diaphragm case and the outer periphery of the spring case, and there is a possibility that the outer peripheral edge may leak. is there.
The present invention has been made in view of the above problems, and the pressure-sensitive chamber pressure becomes high over a long period of time, and the spring case that clamps the outer peripheral edge of the diaphragm in cooperation with the outer peripheral edge of the diaphragm case. Even if the outer peripheral edge is subjected to high pressure from the pressure sensing chamber side through the diaphragm for a long time, the outer peripheral edge of the spring case is not deformed, and the caulking coupling portion between the outer peripheral edge of the diaphragm case and the outer peripheral edge of the spring case An object of the present invention is to provide a pressure reducing valve that does not loosen and does not leak from the outer peripheral edge.

In order to solve the above problems, in the present invention, a cylinder, a piston head that reciprocates in the cylinder, a first piston rod that extends from one end surface of the piston head and projects out of the cylinder from one end of the cylinder, A cylindrical valve seat formed at the one end of the cylinder, a valve body fixed to one end of the first piston rod protruding from the cylinder and facing the valve seat, and a portion facing the first piston rod on the cylinder peripheral wall And a second piston rod extending from the other end of the cylinder to the outside of the cylinder, and a diaphragm having a central portion fixed to one end of the second piston rod protruding from the other end of the cylinder. A diaphragm case that faces the diaphragm and forms a pressure sensing chamber in cooperation with the diaphragm, the cylinder, and the piston head, and the cylinder A pressure guide hole formed on the wall and extending from the one end to the other end of the cylinder to guide the secondary pressure to the pressure sensing chamber, a spring for pressing the diaphragm toward the pressure sensing chamber, a spring is accommodated and an outer peripheral edge is provided A spring case that clamps the outer peripheral edge of the diaphragm in cooperation with the outer peripheral edge of the diaphragm case, the outer peripheral edge of the diaphragm case and the outer peripheral edge of the spring case are caulked and joined, and the diaphragm case and the spring case Reinforcement to prevent deformation of the outer peripheral edge of the spring case by sandwiching a portion radially inward of the caulking joint portion of the outer peripheral edge portion of the diaphragm case and an inner radial portion of the caulking joint portion of the outer peripheral edge portion of the spring case. A pressure reducing valve comprising a member is provided.
The pressure reducing valve according to the present invention is attached to the diaphragm case and the spring case, and includes a portion radially inward of the caulking joint portion of the outer peripheral edge portion of the diaphragm case and a portion radially inward of the caulking joint portion of the outer peripheral edge portion of the spring case. Since the reinforcing member is provided to prevent the outer peripheral edge of the spring case from being sandwiched, the pressure-sensitive chamber pressure becomes high over a long period of time and cooperates with the outer peripheral edge of the diaphragm case to remove the outer periphery of the diaphragm. Even if the outer peripheral edge of the spring case holding the peripheral edge is subjected to high pressure from the pressure sensing chamber side through the diaphragm for a long time, the outer peripheral edge of the spring case is not deformed, and the outer peripheral edge of the diaphragm case and the spring case The caulking joint portion at the outer peripheral edge does not loosen, and there is no risk of leakage from the outer peripheral edge.

In a preferred aspect of the present invention, the reinforcing member has a first ring having a groove-shaped cross section, a flat plate-like second ring, and a screw for fastening both, and the inner peripheral edge of the second ring is outside the diaphragm case. Contact the radially inner part of the peripheral edge of the caulking joint, and the leg of the groove-shaped cross section on the inner diameter side of the first ring contact the inner radial part of the caulking joint of the outer peripheral edge of the spring case. The first ring and the second ring using screws that engage the outer peripheral edge of the second ring with the legs of the groove-shaped cross section on the outer diameter side of the first ring and screwed into the first ring and the second ring The fastening member is attached to the diaphragm case and the spring case.
The reinforcing member having the above configuration can be easily attached to the diaphragm case and the spring case of the existing pressure reducing valve. The inner peripheral portion of the second ring fastened integrally and the leg portion of the groove-shaped cross section on the inner diameter side of the first ring, the radially inner portion of the outer peripheral peripheral portion of the diaphragm case, and the outer peripheral peripheral portion of the spring case By sandwiching the part radially inward of the caulking joint part, deformation of the outer peripheral edge part of the spring case is surely prevented, and loosening of the caulking joint part of the outer periphery part of the diaphragm case and the outer peripheral part of the spring case is surely prevented. Thus, leakage from the outer peripheral edge is reliably prevented.
In a preferred aspect of the present invention, a notch is formed in the outer peripheral edge of the first ring and the outer peripheral edge of the second ring, and the reinforcing member is attached to the diaphragm case and the spring case. The notch faces the notch of the second ring.
A pressure reducing valve and a valve other than the pressure reducing valve such as a water stop valve are attached to the pipe member adjacent to each other, and are provided to the market as a pipe unit with a valve. In order to reduce the size of the unit, the pressure reducing valve and the other valve are attached close to the pipe member. If the notch of the first ring faces the notch of the second ring in a state where the reinforcing member is attached to the diaphragm case and the spring case of the pressure reducing valve, the notch is directed to the other valve adjacent to the pressure reducing valve. By directing, interference between the reinforcing member and the other valve can be avoided.

In the present invention, the first ring having a groove-shaped cross section, a flat plate-like second ring, and a screw for fastening both of them, the inner peripheral edge of the second ring is caulked to the outer peripheral edge of the diaphragm case of the pressure reducing valve. Abutting a portion on the radially inner side of the coupling portion, a leg portion of the groove-shaped cross section on the first ring inner diameter side abutting on a portion on the radially inner side of the caulking coupling portion of the outer periphery of the spring case of the pressure reducing valve, The first ring and the second ring are formed by using a screw threadedly engaged with the first ring and the second ring, with the legs of the groove-shaped cross section on the outer diameter side of the first ring being brought into contact with the outer peripheral edge of the second ring. The pressure reducing valve reinforcing member is attached to the diaphragm case and the spring case of the pressure reducing valve.
The reinforcing member according to the present invention can be easily attached to a diaphragm case and a spring case of an existing pressure reducing valve. The inner peripheral portion of the second ring fastened integrally and the leg portion of the groove-shaped cross section on the inner diameter side of the first ring, the radially inner portion of the outer peripheral peripheral portion of the diaphragm case, and the outer peripheral peripheral portion of the spring case By sandwiching the part radially inward of the caulking joint part, the outer peripheral edge part of the spring case can be reliably prevented from being deformed, and the caulking joint part between the outer peripheral edge part of the diaphragm case and the outer peripheral part of the spring case is reliably prevented from loosening. And leakage from the outer peripheral edge can be reliably prevented.

The pressure reducing valve according to the present invention is detachably attached to the diaphragm case and the spring case, and is located radially inward of the caulking joint portion of the outer peripheral edge portion of the diaphragm case and the caulking joint portion of the outer peripheral edge portion of the spring case. This is equipped with a reinforcing member that clamps the outer periphery of the spring case and prevents deformation of the outer peripheral edge of the spring case, so that the pressure-sensitive chamber pressure becomes high over a long period of time and cooperates with the outer peripheral edge of the diaphragm case. Even if the outer peripheral edge of the spring case sandwiching the outer peripheral edge of the diaphragm is subjected to high pressure from the pressure sensing chamber side for a long time via the diaphragm, the outer peripheral edge of the spring case is not deformed and the outer peripheral edge of the diaphragm case The caulking joint portion between the outer peripheral edge portion and the spring case does not loosen, and there is no risk of leakage from the outer peripheral edge portion.

A pressure reducing valve according to an embodiment of the present invention will be described.
As shown in FIGS. 1 and 2, the pressure reducing valve 100 includes a cylinder 101, a piston head 102 that reciprocates in the cylinder 101, and extends from one end face of the piston head 102 and projects out of the cylinder 101 from one end of the cylinder 101. The first piston rod 103, the cylindrical valve seat 104 formed at the one end of the cylinder 101 through which the first piston rod 103 is inserted, and the one end of the first piston rod 103 that protrudes outside the cylinder 101 are fixed. A valve body 105 facing the valve seat 104, a plurality of valve inlets 106 formed at a portion facing the first piston rod 103 on the circumferential wall of the cylinder 101, and the other end surface of the cylinder 101 extending from the other end face of the piston head 102 A second piston rod 107 projecting out of the cylinder 101 from the end, and a cylinder of the second piston rod 107 101, a diaphragm 108 having a central portion fixed at one end protruding from the other end, a diaphragm case 110 that forms a pressure sensitive chamber 109 in cooperation with the diaphragm 108, the cylinder 101, and the piston head 102, facing the diaphragm 108, and a cylinder A plurality of pressure introducing holes 111 that are formed in the peripheral wall of the cylinder 101 and extend from the one end to the other end of the cylinder 101 to guide the secondary pressure of the pressure reducing valve 100 to the pressure sensing chamber 109, and the diaphragm 108 to the pressure sensing chamber 109 side. A spring 112 to be pressed, a spring case 113 that houses the spring 112 and an outer peripheral edge of the diaphragm 112 cooperates with the outer peripheral edge of the diaphragm case 110, and is held in a circumferential groove of the piston head 102. An O-ring 114 that seals the sliding contact portion between the piston head 102 and the inner peripheral surface of the cylinder 101; An O-ring 115 that seals the caulking joint between the inner peripheral edge of the metal plate diaphragm case 110 that has been machined and the other end of the metal cylinder 101 that has been machined, and an outer circumferential surface of the cylinder 101 are formed. O-rings 116 and 117 accommodated in the circumferential groove.
The outer peripheral edge of the diaphragm case 110 and the outer peripheral edge of the pressed metal plate spring case 113 are caulked and joined, and the caulking joint is formed by an annular protrusion 108 a formed on the outer peripheral edge of the diaphragm 108. It is sealed.

The pressure reducing valve 100 is further detachably attached to the diaphragm case 110 and the spring case 113, and has a diameter that is radially inward of the caulking coupling portion of the outer peripheral edge portion of the diaphragm case 110 and the caulking coupling portion of the outer peripheral edge portion of the spring case 113. A reinforcing ring assembly 118 that sandwiches the inner portion in the direction and prevents deformation of the outer peripheral edge of the spring case 113 is provided.
The reinforcing ring assembly 118 includes a first ring 119 having a groove-shaped cross section, a flat plate-like second ring 120, and a plurality of screws 121 for fastening the two. The inner peripheral edge of the second ring 120 is brought into contact with a portion radially inward of the caulking coupling portion of the outer peripheral edge of the diaphragm case 110, and the leg portion 119a of the groove-shaped cross section on the inner diameter side of the first ring 119 is connected to the outer peripheral edge of the spring case 113. The first ring 119 is brought into contact with a portion radially inward of the caulking coupling portion, the leg portion 119b of the groove-shaped cross section on the outer diameter side of the first ring 119 is brought into contact with the outer peripheral edge portion of the second ring 120, and The reinforcing ring assembly 118 is attached to the diaphragm case 110 and the spring case 113 by fastening the first ring 119 and the second ring 120 by tightening the screw 121 that is screwed to the second ring 120.
Notches 119c and 120a are formed in the outer peripheral edge portion of the first ring 119 and the outer peripheral edge portion of the second ring 120, and the reinforcing ring assembly 118 is attached to the diaphragm case 110 and the spring case 113. The notch 119c of the first ring 119 faces the notch 120a of the second ring 120. The notches 119c and 120a are directed toward the water stop valve 300 described later.

The pipe member 200 to which the pressure reducing valve 100 is attached is formed of a casting. The pipe member 200 is opposed to the cylindrical part 201 into which the cylinder 101 of the pressure reducing valve 100 is press-fitted and fixed, the pressure reducing valve primary side opening 202 formed in the cylindrical part 201 facing the valve inlet 106, and the valve body 105. And a secondary opening 203 for the pressure reducing valve formed in the cylindrical portion 201.

The cylinder 101 of the pressure reducing valve 100 is press-fitted and fixed to the cylindrical portion 201 of the pipe member 200, and the contact portion between the cylinder 101 and the cylindrical portion 201 is sealed by the O-rings 116 and 117, and the pressure reducing valve 100 is assembled to the pipe member 200. It is attached.
A water stop valve 300 is assembled to the pipe member 200 adjacent to and close to the pressure reducing valve 100. The base portion that is press-fitted and fixed to the pipe member 200 of the water stop valve 300 faces the notches 119 c and 120 a of the reinforcing ring assembly 118.
The pressure-reducing valve 100, the water stop valve 300, and the pipe member 200 form a valved pipe unit α.
The primary side opening 204 of the pipe member 200 is connected to a water pipe (not shown) via a connection pipe (not shown), and the secondary side opening 205 of the pipe member 200 is connected to a water supply device (not shown) via a connection pipe (not shown). Yes.

In the pressure reducing valve 100, the liquid supplied from the water pipe (not shown) through the connection pipe (not shown) and the water stop valve 300 passes through the pressure reducing valve primary side opening 202 of the pipe member 200 and further passes through the valve inlet 106. And flows into the cylinder 101, flows in the cylinder 101 toward the valve seat 104, flows out of the cylinder 101 through the annular gap between the valve seat 104 and the valve body 105, and is used for the pressure reducing valve of the pipe member 200. It is supplied to a watering device (not shown) through the secondary side opening 203, the secondary side opening 205, and a connection pipe (not shown).
As the liquid passes through the annular gap between the valve seat 104 and the valve body 105, a pressure loss occurs and the liquid is depressurized.

When the liquid downstream of the annular gap flows into the pressure sensing chamber 109 via the pressure guide hole 111, the secondary pressure of the pressure reducing valve 100, which is the liquid pressure downstream of the annular gap, is applied to the diaphragm 108. Is done. The primary pressure of the pressure reducing valve 100, which is the liquid pressure upstream of the annular gap, is sensed by the O-ring 114 housed in the circumferential groove of the piston head 102 sealing the sliding contact portion between the piston head 102 and the cylinder 101. It is not transmitted to the pressure chamber 109 and is not applied to the diaphragm 108.
When the secondary pressure rises for some reason, the diaphragm 108 is elastically deformed in the direction away from the valve seat 104 against the biasing force of the spring 112, and the second piston rod 107 fixed to the diaphragm 108 is eventually replaced with the piston head 102, The first piston rod 103 follows the diaphragm 108 and moves toward the diaphragm 108, and the valve body 105 approaches the valve seat 104. As a result, the annular gap between the valve seat 104 and the valve body 105 is narrowed, the pressure loss when the liquid passes through the annular gap is increased, and the secondary pressure is lowered. Therefore, in the pressure reducing valve 100, the secondary pressure is maintained below a predetermined value.

Foreign matter in the pipe such as iron rust is sandwiched between the valve seat 104 and the valve body 105, and the annular gap between the valve seat 104 and the valve body 105 remains widened, so that the secondary pressure and thus the pressure sensitive chamber are increased. The internal pressure of 109 may become high over a long period of time.
In the pressure reducing valve 100, the leg portion 119a of the groove-shaped cross section on the inner diameter side of the first ring 119 included in the reinforcing ring assembly 118 is in contact with a portion on the radially inner side of the caulking coupling portion of the outer peripheral edge portion of the spring case 113, The first ring 119 and the second ring 120 are screwed in a state where the inner peripheral edge of the second ring 120 included in the assembly 118 is in contact with the radially inner portion of the outer peripheral edge of the diaphragm case 110. By being fastened by 121, the leg portion 119a of the groove-shaped cross section on the inner diameter side of the first ring 119 and the inner peripheral edge portion of the second ring 120 are radially inward of the caulking coupling portion of the outer peripheral edge portion of the spring case 113. Between the outer peripheral edge of the diaphragm case 110 and the portion radially inward of the caulking joint portion, the internal pressure of the pressure sensing chamber 109 becomes high for a long time. , The deformation of the portions of radially inward of the caulking portion of the spring case 113 the outer peripheral edge portion is reliably prevented. Therefore, the caulking joint between the outer peripheral edge of the diaphragm case 110 and the outer peripheral edge of the spring case 113 does not loosen, and there is no risk of leakage from the outer peripheral edge.
The reinforcing ring assembly 118 composed of the first ring 119, the second ring 120, and the screw 121 can be easily retrofitted to the diaphragm case 110 and the spring case 113 of the existing pressure reducing valve 100.
The valved pipe unit α is offered to the market. In order to reduce the size of the unit, the pressure reducing valve 100 and the water stop valve 300 are close to each other and attached to the pipe member 200. With the reinforcing ring assembly 118 attached to the diaphragm case 110 and the spring case 113 of the pressure reducing valve 100, the notch 119c of the first ring 119 faces the notch 120a of the second ring 120. By directing in the direction of the water stop valve 300 adjacent to the pressure reducing valve 100, interference between the reinforcing ring assembly 118 and the water stop valve 300 can be avoided.

In the above embodiment, the outer peripheral edge of the diaphragm case 110 and the outer peripheral edge of the spring case 113 are continuously clamped over the entire circumference using the reinforcing ring assembly 118, but the diaphragm is formed using a plurality of clamping members. The outer peripheral edge of the case 110 and the outer peripheral edge of the spring case 113 may be intermittently sandwiched. Even if the effect is not as good as that of the reinforcing ring assembly 118, deformation of the outer peripheral edge of the spring case 113 can be prevented, and leakage from the caulking joint can be prevented.
It is desirable that the screw 121 be prevented from being easily removed by using a tamper-proof screw.

It is sectional drawing of the pressure reducing valve which concerns on the Example of this invention. It is an II-II arrow line view of FIG.

Explanation of symbols

100 Pressure reducing valve 108 Diaphragm 110 Diaphragm case 113 Spring case 118 Reinforcing ring assembly 119 First ring 120 Second ring 121 Screw 200 Pipe member 300 Water stop valve α Valve-equipped pipe unit

Claims (4)

A cylinder, a piston head that reciprocates in the cylinder, a first piston rod that extends from one end face of the piston head and protrudes from one end of the cylinder to the outside of the cylinder, and a cylindrical valve seat formed at the one end of the cylinder A valve body fixed to one end of the first piston rod protruding from the cylinder and facing the valve seat, a valve inlet formed in a portion of the cylinder peripheral wall facing the first piston rod, and extending from the cylinder head A second piston rod projecting from the other end of the cylinder to the outside of the cylinder, a diaphragm having a central portion fixed to one end projecting from the other end of the cylinder of the second piston rod, and a diaphragm, a cylinder, and a piston head facing the diaphragm Diaphragm case that cooperates to form a pressure sensitive chamber, and from one end of the cylinder to the other end formed on the cylinder peripheral wall A pressure introducing hole for guiding the secondary pressure to the pressure sensing chamber, a spring for pressing the diaphragm toward the pressure sensing chamber, and the outer peripheral edge portion of the diaphragm case in cooperation with the outer peripheral edge portion of the diaphragm case. A spring case sandwiching the outer peripheral edge, and the outer peripheral edge of the diaphragm case and the outer peripheral edge of the spring case are caulked and joined, and further, attached to the diaphragm case and the spring case, from the caulking joint of the outer peripheral edge of the diaphragm case A pressure reducing valve comprising a reinforcing member that sandwiches a radially inner portion and a radially inner portion of the caulking coupling portion of the spring case outer peripheral edge portion to prevent deformation of the spring case outer peripheral edge portion. The reinforcing member has a first ring having a groove-shaped cross section, a flat plate-like second ring, and a screw for fastening both, and the inner peripheral edge portion of the second ring is more than the caulking joint portion of the outer peripheral edge portion of the diaphragm case. Abutting against the radially inner portion, the leg portion of the groove-shaped cross section on the inner diameter side of the first ring is brought into contact with the portion on the radially inner side of the caulking coupling portion of the outer peripheral edge of the spring case, Reinforcing the first ring and the second ring by fastening the legs of the groove-shaped cross section to the outer peripheral edge of the second ring and using screws that are screwed into the first ring and the second ring. The pressure reducing valve according to claim 1, wherein the member is attached to a diaphragm case and a spring case. A notch is formed in the outer periphery of the first ring and the outer periphery of the second ring, and the notch of the first ring is formed in the notch of the second ring in a state where the reinforcing member is attached to the diaphragm case and the spring case. The pressure reducing valve according to claim 1, wherein the pressure reducing valve faces directly. It has a groove-shaped first ring, a flat plate-like second ring, and a screw for fastening both, and the inner peripheral edge of the second ring has a diameter larger than the caulking joint of the outer peripheral edge of the diaphragm case of the pressure reducing valve. The first ring outer diameter is brought into contact with the inner portion of the first ring inner diameter side of the groove-shaped cross section, and the outer diameter of the first ring is brought into contact with the inner portion of the spring case outer peripheral edge of the pressure reducing valve. The first ring and the second ring are fastened using a screw threadedly engaged with the first ring and the second ring, with the leg portion of the groove-type cross section on the side being brought into contact with the outer peripheral edge of the second ring A reinforcing member for a pressure reducing valve, which is attached to a diaphragm case and a spring case of the pressure reducing valve.

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