JP6050039B2 - Pressure reducing valve - Google Patents

Description

  The present invention relates to a pressure reducing valve used in a hot water supply facility or the like, and in particular, a primary pressure is applied to a valve body or a passage structure to prevent a resin valve body or a passage component from being destroyed by pressure. The present invention relates to a pressure reducing valve that is provided with a relief valve in a valve body that opens when a pressure limit value of a component is exceeded and releases the pressure on the primary side to the secondary side.

  As this kind of pressure-reducing valve, as described in Patent Document 1 below, for example, a valve having a resin valve body, a valve rod, and a pressure-sensitive reaction member (diaphragm device) is known.

  Specifically, the valve body made of resin has an upper surface opened, a valve chamber having a valve seat with a valve port is provided inside, an outflow chamber is provided below the valve port, and a valve chamber is provided on the outer periphery. A continuous primary side inlet and a secondary side outlet connected to the outflow chamber are provided.

  The valve stem is provided with a valve body portion for opening and closing the valve port from below, and is fitted into the valve body so as to be slidable in the vertical direction.

  The diaphragm device is attached to the upper part of the valve body so as to close the upper surface opening of the valve body so as to open and close the valve rod in the vertical direction.

  A pressure sensitive chamber is provided between the secondary outlet and the pressure sensitive member for causing the pressure sensitive member to sense a secondary pressure.

  In such a pressure reducing valve, in order to prevent the resin valve main body and passage components from being destroyed by pressure, the valve is opened when the pressure on the primary side exceeds a predetermined pressure, and the pressure on the primary side is reduced. A relief valve for escaping to the next side is provided in the valve body.

Japanese Patent No. 4290200

  However, the pressure reducing valve described in Patent Document 1 has the following problems to be solved. That is, since the relief valve opening of the relief valve opens into the pressure sensing chamber, when the primary side pressure exceeds a predetermined pressure, when the relief valve opens, the primary side pressure passes through the pressure sensing chamber from the relief valve. Therefore, there is a possibility that the diaphragm device is adversely affected and the pressure regulation operation is disturbed.

  In addition, since the valve rod guide hole, valve chamber, outflow chamber, pressure sensing chamber, etc. are formed in a single valve body and the valve rod is retrofitted, the lower surface of the valve body is used as an opening. After inserting the valve stem from the opening, it is necessary to seal the lower surface opening with a separate screw-type bottom cover member and to seal the closed portion with an O-ring or the like in order to ensure airtightness with the outside. For this reason, there are problems such as an increase in the number of parts and an increase in parts cost and processing / assembly cost.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to reduce the number of parts and reduce the processing and assembly cost as much as possible without adversely affecting the pressure-sensitive response member when the relief valve is opened. An object of the present invention is to provide a pressure reducing valve capable of effectively reducing the above-described reduction.

In order to achieve the above object, the pressure reducing valve according to the present invention basically has a valve chamber having an open top surface and a valve seat with a valve opening therein, and is also discharged to the lower side of the valve opening. For opening and closing the valve port from the lower side thereof, and a valve body made of resin having a primary side inlet connected to the valve chamber and a secondary side outlet connected to the outflow chamber on the outer periphery. And a valve rod that is slidably inserted in the valve body in an up-and-down direction, and an upper portion of the valve body that closes an upper surface opening of the valve body to open and close the valve rod. A pressure sensitive chamber attached to the pressure sensitive member, and a pressure sensing chamber is provided on the lower surface side of the pressure sensitive reactive member at the upper part of the valve body to cause the pressure sensitive reactive member to sense a secondary pressure. The valve body has a primary side inlet, a secondary side outlet, and a bottomed cylindrical portion that opens to the inlet and outlet. A resin housing member, and a resin holder member provided with a valve hole and a guide hole into which the valve rod is slidably inserted and fixed to the bottomed cylindrical portion. In addition , a relief valve is provided laterally at a specific portion of the valve body to release the primary pressure to the outflow chamber when the primary pressure exceeds a predetermined pressure.

In a preferred embodiment, the valve rod is provided with a pressure sensitive passage for communicating the outflow chamber and the pressure sensitive chamber.
In another preferred embodiment, a pressure-sensitive passage that communicates the outflow chamber and the pressure-sensitive chamber is provided on the outer peripheral portion of the valve body.

  The holder member preferably has a lower small diameter portion having a smaller diameter than the bottomed cylindrical portion of the housing member, and between the outer peripheral surface of the lower small diameter portion and the inner peripheral surface of the bottomed cylindrical portion, and The outflow chamber is defined between a lower end surface of the lower small diameter portion and a bottom portion of the bottomed cylindrical portion.

The relief valve is preferably provided in the lower small diameter portion along the radial direction.
The relief valve preferably comprises a relief valve port that opens to the valve chamber, a ball valve body that opens and closes the relief valve port, and a compression coil spring that biases the ball valve body in the valve closing direction. And the bottomed tubular portion is used as a spring receiver for the valve closing spring.

The holder member is preferably fixed to the bottomed cylindrical portion by welding and / or press-fitting.
Preferably, the valve body portion is fitted on and fixed to the lower part of the valve stem, and an annular or short cylindrical seal member that is fitted onto the lower part of the valve stem and contacts and separates from the valve seat. A lower pressing member for fixing, and the lower pressing member is fixed by caulking at a cylindrical lower end portion provided on the valve rod.

  Preferably, the pressure-sensitive response member is airtightly attached to the valve body so as to cover an upper surface opening thereof, and a diaphragm to which an upper part of the valve rod is connected, and an outer peripheral part of the diaphragm cooperate with the valve body. A step-shaped convex cap having a stepped cross section, a compression coil spring disposed between the diaphragm and an upper portion of the cap, and biasing the diaphragm downward, and the compression coil spring A spring bearing nut member for receiving the upper end of the compression coil spring, and a male threaded portion is formed on the spring bearing nut member for adjusting the set load of the compression coil spring, and at the top of the cap An internal thread portion is formed in which the external thread portion is screwed together.

  In the pressure reducing valve according to the present invention, the installation site of the relief valve is not the pressure sensitive member as in the conventional example, but the side opposite to the pressure sensitive member, and when the primary pressure exceeds a predetermined value, It is configured to release the primary pressure to the secondary outlet through the outlet chamber close to the secondary outlet (not the pressure sensing chamber as in the conventional example) via the relief valve. The influence on the pressure-sensitive response member when is opened can be reduced as compared with the conventional example. Therefore, it is possible to prevent the valve body made of resin, the passage components, and the like from being destroyed by pressure without disturbing the pressure regulation operation.

  Further, since the relief valve is provided sideways, a cylindrical portion that forms a part of the valve body can be used as a spring receiver for the valve closing spring that constitutes the relief valve. For this reason, it is possible to effectively reduce the number of parts and the processing / assembling cost as compared with the case where a spring receiver needs to be provided separately.

  Further, the valve main body is inserted and fixed to the bottomed cylindrical portion, and a resin housing member having a primary side inlet, a secondary side outlet, and a bottomed cylindrical portion that opens to the inlet and outlet. The valve body is divided into a guide hole into which the valve rod is slidably inserted and a resin holder member provided with a valve chamber, so that the lower surface opening of the valve body is a separate screw-type bottom as in the conventional example. It is not necessary to close the closed portion with an O-ring or the like while closing with the lid member. For this reason, it is possible to effectively reduce the number of parts and the processing and assembly costs.

The partial notch which shows 1st Example of the pressure-reduction valve which concerns on this invention (The central angle 90 degree | times part is a notch part by planar view) perspective view. (A) is a longitudinal cross-sectional view according to the JJ arrow line of FIG. 1, (B) is an enlarged view around the relief valve of (A). The longitudinal cross-sectional view which follows the KK arrow line of FIG. The partial notch which shows 2nd Example of the pressure-reduction valve which concerns on this invention (The central angle 90 degree | times part is a notch part by planar view) perspective view. The longitudinal cross-sectional view which follows the JJ arrow line of FIG. The longitudinal cross-sectional view according to the KK arrow line of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a partially cutaway perspective view showing a first embodiment of a pressure reducing valve according to the present invention (a portion having a central angle of 90 degrees in a plan view), and FIG. 2A is a view taken along line JJ in FIG. FIG. 3 is a longitudinal sectional view taken along the line KK in FIG.

The illustrated pressure reducing valve 1 includes a resin valve body 10, a valve rod 30, and a diaphragm device 40 as a pressure sensitive response member.
The valve body 10 made of resin has an upper surface opened, a valve chamber 21 having a valve seat 23 with a valve port 22 provided therein, an outflow chamber 26 provided below the valve port 22, and a valve on the outer periphery. A primary side inlet 11 connected to the chamber 21 and a secondary side outlet 12 connected to the outlet chamber 26 are provided. In addition, a pressure-sensitive chamber 24 for causing the diaphragm device 40 to sense the secondary side pressure is defined on the lower surface side of the diaphragm device 40 (diaphragm 41) at the upper portion of the valve body 10. If the valve rod 30 is solid, the pressure sensitive chamber 24 is substantially sealed.

  The valve stem 30 is, in order from the top, an upper convex portion 31, a diaphragm support portion 32, a sliding large diameter portion 33, an intermediate small diameter portion 34, and a lower portion with a conical locking portion 36a connected to a diaphragm device 40 described later. The cylindrical portion 36 and the lower cylindrical portion 36 are externally fitted, and have a valve body portion 35 for opening and closing the valve port 22 from the lower side thereof. 19) is slidably inserted in the vertical direction. The valve rod 30 is formed with a pressure sensitive passage 60 that allows the outflow chamber 26 and the pressure sensitive chamber 24 to communicate with each other. The pressure-sensitive passage 60 includes a straight vertical hole 61 that opens to the outflow chamber 26 and two horizontal holes 62 and 62 that are arranged in a cross shape and open to the pressure-sensitive chamber 24.

  The valve body 35 has a short cylindrical rubber seal member 35a contacting and separating from the valve seat 23, and a through hole for fixing the seal member 35a to the lower cylindrical portion 36 with the conical locking portion 36a. The lower pressing member 37 having a bottomed short cylindrical shape with a hole 37a is fixed by caulking (caulking portion 38) at the lower end portion of the pressure-sensitive passage 60 (vertical hole 61).

  The diaphragm device 40 is attached to an upper portion of the valve body 10 so as to close the upper surface opening 10a of the valve body 10 so as to open and close the valve rod 30 in the vertical direction. Specifically, the diaphragm device 40 includes a diaphragm 41 disposed so as to cover the upper surface opening 10 a of the valve body 10, and an outer peripheral portion of the diaphragm 41 in cooperation with the diaphragm receiving portion 10 b of the valve body 10. A convex cap 42 having a stepped cross-section, which is clamped and sealed at 42b, a compression coil spring 45 disposed between the diaphragm 41 and the upper portion of the cap 42, and biasing the diaphragm 41 downward, and a valve stem 30 has a central inner cylinder portion 43a in which the upper convex portion 31 is press-fitted and fixed, is placed on the diaphragm 41 to receive the lower end of the compression coil spring 45, and cooperates with the diaphragm support portion 32 of the valve rod 30. A lower spring receiving member 43 that sandwiches the diaphragm 41, and a hexagon socket spring receiving nut member 46 that receives the upper end of the compression coil spring 45; By fastening fixed to the mounting portion 10c of the valve body 10 the lower end face portion 42b of the cap 42 by a plurality of bolts 48, it is assembled to the valve body 10.

  In the diaphragm device 40, a male threaded portion 46 e is formed on the spring receiving nut member 46 so as to adjust the set load of the compression coil spring 45, and the male threaded portion 46 e is formed on the inner periphery of the upper mouth tube portion 42 a of the cap 42. A female screw portion 42i to be screwed is formed.

  More specifically, the valve body 10 includes a resin-made housing member 15 having a primary side inlet 11, a secondary side outlet 12, and a bottomed cylindrical portion 16 through which the inlet 11a and outlet 12a open. A resin holder member provided with a guide hole 19 and a valve chamber 21, which are inserted into and fixed to the bottomed tubular portion 16 and into which the valve rod 30 (the sliding large diameter portion 33) is slidably inserted. 20 and divided.

  The holder member 20 includes an upper fitting portion 20A provided with a recess 20d constituting a part of the pressure sensitive chamber 24, a notch intermediate portion 20B, a lower fitting portion 20C, and the lower fitting portion 20C. The bottomed cylindrical portion 16 (the cylindrical portion 16C) of the housing member 15 is connected to the lower small diameter portion 20D. The valve chamber 21 formed in the holder member 20 has a fan-shaped cutout space 21a formed in the cutout intermediate portion 20B and opened in the inlet 11a of the primary inflow port 11, and a lower fitting portion 20C. It consists of a cylindrical space 21b formed between the notch space 21a and the valve port 22 formed.

  An O-ring 28 is attached to the outer periphery of the sliding large-diameter portion 33 of the valve stem 30 so as to seal a sliding surface gap formed between the valve rod 30 and the guide hole 19.

On the other hand, a large-diameter insertion hole 16a is formed in the inner periphery of the upper end portion of the bottomed tubular portion 16, and the upper-end portion of the upper fitting portion 20A of the holder member 20 is fitted into the large-diameter insertion hole 16a. A fitting portion 20a is provided, and at the time of assembly, the holder member 20 is dropped into the bottomed cylindrical portion ( bottomed cylindrical portion ) 16 so that a contact portion between the large-diameter fitting insertion hole 16a and the fitting portion 20a is provided. It is designed to be welded and fixed by ultrasonic welding. By ultrasonically welding the large-diameter fitting insertion hole 16a and the fitting portion 20a in this manner, the portion is hermetically joined, and there is no need to separately install a sealing material. The housing member 15 and the holder member 20 are preferably made of the same material in terms of ultrasonic welding.

  Further, between the outer peripheral surface of the lower small-diameter portion 20D of the holder member 20 and the inner peripheral surface of the cylindrical portion 16C of the bottomed cylindrical portion 16, and the lower end surface of the lower small-diameter portion 20D and the bottomed cylinder The outflow chamber 26 is defined between the bottom portion 16 b of the shape portion 16.

  An O-ring 29 is mounted on the outer periphery of the lower part of the holder member 20 so as to seal a gap formed between the bottomed cylindrical portion 16.

In this embodiment, the relief valve 70 that opens when the pressure on the primary side exceeds a predetermined pressure is used as a holder member in order to prevent the resin valve body 10 and the passage components from being destroyed by pressure. 20 is provided laterally on the lower small diameter portion 20D (along the lower small diameter portion 20D along the radial direction). Specifically, the relief valve 70 has a bottomed storage hole 71 formed sideways along the radial direction from the outer peripheral surface of the lower small diameter portion 20D, as can be understood by referring to the enlarged view of FIG. And a relief valve port 73 formed of an orifice formed in the bottom (valve seat) 72 of the storage hole 71 and opening to the valve chamber 21 (valve port 22), and a rubber ball valve for opening and closing the relief valve port 73 And a valve closing spring 76 made of a compression coil spring that urges the ball valve element 75 in the valve closing direction. The valve ball spring 76 has an anti-ball valve element 75 side (hereinafter referred to as the other end side). The cylindrical portion 16C of the bottomed cylindrical portion 16 is used as a spring receiver.

  When assembling the relief valve 70 to the valve body 10, before dropping the holder member 20 into the bottomed cylindrical portion 16 (at the time of assembly), the ball is inserted into the storage hole 71 provided in the lower small diameter portion 20 </ b> D of the holder member 20. The valve body 75 and the valve closing spring 76 (one end side thereof) are inserted in advance, and the other end side of the valve closing spring 76 is not caught on the inner peripheral edge of the upper end of the cylindrical portion 16C of the bottomed cylindrical portion 16. If the other end side of the valve-closing spring 76 is pressed and compressed by some means such as a screwdriver (screwdriver), and the holder member 20 is dropped into the bottomed cylindrical portion 16 in this state, the valve-closing spring 76 expands in the bottomed cylindrical portion 16 to a set state as shown.

  The set position of the relief valve 70 in the horizontal plane can be arbitrarily set by rotating the holder member 20 relative to the bottomed cylindrical portion 16 before the holder member 20 is welded and fixed.

In the pressure reducing valve 1 of the present embodiment having such a configuration, the relief valve 70 is provided in the lower fitting portion 20 </ b> C of the holder member 20. In other words, the installation site of the relief valve 70 is not the diaphragm 41 side as in the conventional example, but the side opposite to the diaphragm 41, and when the primary pressure exceeds a predetermined pressure, the primary pressure is released. Through the outflow chamber 26 close to the secondary side outflow port 12 (not in the pressure sensitive chamber 24 as in the conventional example), the relief valve 70 is configured to escape to the secondary side outflow port 12. When is opened , the influence on the diaphragm device 40 is smaller than that of the conventional example. Therefore, it is possible to prevent the valve body 10 made of resin, the passage components, and the like from being destroyed by pressure without disturbing the pressure regulation operation.

  Further, since the relief valve 70 is provided sideways, the bottomed cylindrical portion 16 can be used as a spring receiver for the valve closing spring 76 constituting the relief valve 70. For this reason, it is possible to effectively reduce the number of parts and the processing and assembly costs as compared with the case where a spring receiver is provided separately.

Further, the valve body 10 includes a resin housing member 15 having a primary side inlet 11, a secondary side outlet 12, and a bottomed cylindrical portion 16 in which the inlets 11a and 12a are opened, and the bottomed cylinder. Since it is divided into a guide hole 19 in which the valve rod 30 is slidably inserted and a resin holder member 20 provided with a valve chamber 21, which is inserted into and fixed to the shape portion 16, as in the conventional example. It is not necessary to close the lower surface opening of the valve body with a separate screw-in type bottom cover member and to seal the closed portion with an O-ring or the like. Further, since the large-diameter insertion hole 16a of the bottomed cylindrical portion 16 and the fitting portion 20a of the holder member 20 are fixed by ultrasonic welding, the portion is hermetically bonded and separately sealed. There is no need to install material. For this reason, it is possible to effectively reduce the number of parts and the processing and assembly costs.

  Further, the valve rod 30 is formed with a pressure sensing passage 60 for communicating the outflow chamber 26 and the pressure sensing chamber 24, so that the pressure sensing chamber 24 and the secondary outlet 12 are communicated with the valve body 10. For this reason, it is not necessary to provide a communication path. Therefore, simplification of a valve main body, size reduction, weight reduction, etc. can be achieved.

  Further, since the valve body of the relief valve 70 is constituted by the rubber ball valve body 75, it is possible to obtain a good sealing performance, and no additional spring receiving member is required. Reduction, processing assembly cost, etc. can be effectively achieved.

In the diaphragm device 40, a male threaded portion 46 e is formed on the spring receiving nut member 46 so as to adjust the set load of the compression coil spring 45, and the male threaded portion 46 e is screwed on the inner periphery of the upper mouth tube portion 42 a of the cap 42. Since the female screw portion 42i to be fitted is directly formed, the number of parts of the adjusting screw portion can be reduced.
Further, the ball valve body may be made of any material other than rubber, that is, resin, metal, or the like.

  FIG. 4 is a partially cutaway perspective view showing a second embodiment of the pressure reducing valve according to the present invention (a portion having a central angle of 90 degrees in a plan view), and FIG. 5 is a longitudinal section taken along the line JJ in FIG. 6 and 6 are longitudinal sectional views taken along the line KK in FIG.

  The pressure reducing valve 2 of the second embodiment is different from the pressure reducing valve 1 of the first embodiment in that the pressure sensing passage for communicating the outflow chamber 26 and the pressure sensing chamber 24 is not the valve rod 30 but the outer peripheral portion of the valve body 10. Since the other parts including the lateral relief valve 70 have substantially the same configuration, in the following, the parts corresponding to the respective parts of the pressure reducing valve 1 of the first embodiment are The same reference numerals are assigned, duplicate descriptions are omitted, and differences will be mainly described.

  The valve rod 30 of the pressure reducing valve 2 of the second embodiment is the same as that of the pressure reducing valve 1 of the first embodiment except that the pressure sensitive passage 60 (61, 62) is not provided.

  The valve main body 10 includes a resin-made housing member 15 having a primary side inlet 11, a secondary side outlet 12, and a bottomed cylindrical portion 16 in which the inlet 11a and the outlet 12a open, and the bottomed cylindrical shape. It is divided into a resin holder member 20 provided with a guide hole 19 and a valve chamber 21 which are inserted and fixed to the portion 16 and into which the valve rod 30 (the sliding large diameter portion 33) is slidably inserted. ing.

  Between the outer peripheral surface of the lower small diameter portion 20D of the holder member 20 and the inner peripheral surface of the cylindrical portion 16C of the bottomed cylindrical portion 16, and the lower end surface of the lower small diameter portion 20D and the bottomed cylindrical portion. The outflow chamber 26 is defined between the bottom 16b of the sixteen and a pressure-sensitive passage 27 including a vertical hole is formed in the peripheral side portion of the housing member 15 on the secondary outlet 12 side. The pressure-sensitive chamber 24 is defined between the diaphragm 41 and the upper surface of the holder member 20 so as to continue to the upper portion of the pressure passage 27.

  Also in the second embodiment, the relief valve 70 that opens when the pressure on the primary side exceeds a predetermined pressure in order to prevent the resin valve body 10 and the passage components from being destroyed by the pressure. Is provided laterally on the lower small diameter portion 20D of the holder member 20 (along the radial direction of the lower small diameter portion 20D).

  In the pressure reducing valve 2 of this embodiment having such a configuration, the secondary pressure is transmitted to the pressure sensitive chamber 24 via the pressure sensitive passage 27 provided in the peripheral side portion of the housing member 15.

Further, since the relief valve 70 is provided sideways, the bottomed cylindrical portion 16 can be used as a spring receiver of the valve closing spring 76 constituting the relief valve 70. Therefore, when the spring receiver is provided separately. In comparison, it is possible to effectively reduce the number of parts and the processing and assembly costs.
Other functions and effects are substantially the same as those of the first embodiment, and are omitted.

1, 2 Pressure reducing valve 10 Valve body 11 Primary side inlet 12 Secondary side outlet 15 Housing member 16 Bottomed cylindrical portion 19 Guide hole 20 Holder member 20D Lower small diameter portion 21 Valve chamber 22 Valve port 23 Valve seat 24 Pressure sensitive chamber 26 outlet chamber 27 sense pressure passage 30 valve stem 35 valve body 40 diaphragm device 41 Daiafura arm
6 0 Pressure-sensitive passage 70 Relief valve 75 Ball valve element 76 Valve closing spring

Claims (9)

A valve chamber having an upper surface opened and having a valve seat with a valve port is provided therein, an outflow chamber is provided below the valve port, and a primary side inlet and the outflow chamber are connected to the valve chamber on an outer peripheral portion. A valve body made of resin with a secondary side outlet connected to the valve body and a valve body portion for opening and closing the valve port from below, and is slidably inserted vertically into the valve body. And a pressure-sensitive response member attached to an upper portion of the valve body so as to close an upper surface opening of the valve body so as to open and close the valve body in the vertical direction. A pressure reducing valve provided with a pressure sensing chamber on the lower surface side of the pressure responsive member for allowing the pressure sensitive responsive member to sense a secondary side pressure;
The valve body is inserted and fixed to the bottomed cylindrical part, the resin-made housing member having a bottomed cylindrical part where the primary side inlet, the secondary side outlet, and the inlet and outlet are opened, It is divided into a guide hole into which the valve stem is slidably inserted and a resin holder member provided with the valve chamber,
A pressure-reducing valve characterized in that a relief valve is provided laterally at a specific part of the valve body to release the primary side pressure to the outflow chamber when the primary side pressure exceeds a predetermined pressure.   The pressure reducing valve according to claim 1, wherein a pressure sensitive passage for communicating the outflow chamber with the pressure sensitive chamber is provided in the valve rod.   2. The pressure reducing valve according to claim 1, wherein a pressure-sensing passage for communicating the outflow chamber and the pressure-sensing chamber is provided in an outer peripheral portion of the valve body.   The holder member has a lower small diameter portion having a diameter smaller than that of the bottomed cylindrical portion of the housing member, and is formed between an outer peripheral surface of the lower small diameter portion and an inner peripheral surface of the bottomed cylindrical portion, and the lower portion. The pressure reducing valve according to claim 2 or 3, wherein the outflow chamber is defined between a lower end surface of the small diameter portion and a bottom portion of the bottomed cylindrical portion. The pressure reducing valve according to claim 4 , wherein the relief valve is provided in the lower small diameter portion along a radial direction thereof. The relief valve includes a relief valve port that opens to the valve chamber, a ball valve body that opens and closes the relief valve port, and a valve closing spring that includes a compression coil spring that biases the ball valve body in a valve closing direction; The pressure-reducing valve according to claim 4 or 5 , wherein the bottomed cylindrical portion is used as a spring receiver for the valve-closing spring. The pressure reducing valve according to any one of claims 4 to 6 , wherein the holder member is fixed to the bottomed cylindrical portion by welding and / or press fitting. The valve body is externally fitted to the lower part of the valve stem, and has an annular or short cylindrical seal member contacting and separating from the valve seat, and a lower part for fixing the seal member to the lower part of the valve stem. A pressure reducing valve according to any one of claims 1 to 7 , further comprising a side pressing member, the lower pressing member being fixed by caulking at a cylindrical lower end portion provided on the valve rod. . The pressure-sensitive response member is airtightly attached to the valve body so as to cover an upper surface opening thereof, and a diaphragm to which an upper part of the valve rod is connected, and an outer peripheral portion of the diaphragm are sandwiched in cooperation with the valve body. A convex cap with a stepped cross-sectional shape for pressure sealing, a compression coil spring disposed between the diaphragm and the upper part of the cap and biasing the diaphragm downward, and an upper end of the compression coil spring A spring receiving nut member for receiving, a male screw portion is formed on the spring receiving nut member for adjusting the set load of the compression coil spring, and the male screw portion on the cap A pressure reducing valve according to any one of claims 1 to 8, wherein a female screw portion is formed to be screwed together.

Images