JP2013205990A - Pressure reducing valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a pressure actuated member from being subjected to adverse impact when a relief valve opens, and to achieve effective reduction of the number of parts and processing/assembling cost, and other improvements.SOLUTION: A pressure reducing valve includes: an open-top plastic valve body 10 having a valve chest 21 provided with a valve seat 23 having a valve port 22 therein, an outflow chamber 26 located below the valve port, and, on the periphery thereof, a primary side inlet port 11 in communication with the valve chest and a secondary side outlet port 12 in communication with the outflow chamber; a valving element unit 35 for opening and closing the valve port from below; a slidable valve stem 30 inserted vertically through the valve body; a diaphragm unit 40 mounted on the valve body covering a top opening 10a thereof to drive the valve stem up and down to close and open the valve; a pressure sensing chamber 24 located between the secondary side outlet port and a diaphragm 41 to allow the diaphragm unit to sense the secondary side pressure; and a relief valve 50 provided at a specific location of the valve body to release the primary side pressure to the outflow chamber when the primary side pressure exceeds a predetermined value.

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. It is an object of the present invention to provide a pressure reducing valve capable of effectively reducing the above-mentioned.

  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. And a pressure sensitive chamber for causing the pressure sensitive reactive member to sense a secondary pressure between the secondary outlet and the pressure sensitive reactive member. When the primary pressure exceeds a predetermined value at a specific part of the valve body, the primary pressure is released to the outflow chamber. Is characterized in that is valves are provided.

  The valve body is preferably inserted into the bottomed cylindrical part, and the resin-made housing member having the primary side inlet, the secondary side outlet, and a bottomed cylindrical part that opens the inlet and outlet. It is constituted by a fixed guide hole into which the valve stem is slidably inserted and a resin holder member provided with the valve chamber.

  In a preferred embodiment, the holder member is provided with the relief valve, and the outflow chamber is defined between the holder member and the bottom of the bottomed cylindrical portion.

The relief valve preferably includes a relief valve port that opens into the valve chamber, a ball valve body that opens and closes the relief valve port, and a valve closing spring that biases the ball valve body in a valve closing direction. .
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. When the is opened, there is little influence on the pressure sensitive response member. 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, the valve 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 longitudinal cross-sectional view which shows one Example of the pressure-reduction valve which concerns on this invention. FIG. 2 is a partially cutaway perspective view of the pressure reducing valve shown in FIG. 1 (a portion having a central angle of 90 degrees in a plan view).

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a pressure reducing valve according to the present invention, and FIG. 2 is a partial cutaway view of the pressure reducing valve shown in FIG. is there.

  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.

  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. It has a cylindrical body 36 and a valve body part 35 that is fitted on the lower cylindrical part 36 and opens and closes the valve port 22 from the lower side thereof. 19) is slidably inserted in the vertical direction.

  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. A lower holding member 37 having a bottomed short cylindrical shape with a hole 37 a, and the lower holding member 37 is fixed by caulking (caulking portion 38) by a lower end portion of the lower cylindrical portion 36.

  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-sectional shape that is clamped and sealed at 42b, a compression coil spring 45 that is disposed between the diaphragm 41 and the upper portion of the cap 42, and biases 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, a notch intermediate portion 20B, and a lower fitting portion 20C, and a valve chamber 21 formed in the holder member 20 is a primary formed in the notch intermediate portion 20B. A fan-shaped cutout cavity 21a in which the inlet 11a of the side inlet 11 opens, and a cylindrical cavity between the notch cavity 21a and the valve port 22 formed in the lower fitting portion 20C. 21b.

  An O-ring 28 is attached to the outer periphery of the sliding large-diameter portion 33 of the valve stem 30 in order to seal a clearance between sliding surfaces 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. At the time of assembly, the holder member 20 is dropped into the bottomed cylindrical portion 16, and the contact portion between the large-diameter fitting insertion hole 16a and the fitting portion 20a is welded and fixed by ultrasonic welding. It is like that. 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.

  The outflow chamber 26 is defined between the lower surface of the holder member 20 and the bottom portion 16b of the bottomed cylindrical portion 16, and a vertical hole is formed in the peripheral side portion of the housing member 15 on the secondary outlet 12 side. A pressure sensitive passage 27 is formed, and the pressure sensitive chamber 24 is defined between the diaphragm 41 and the upper surface of the holder member 20 so as to be connected to the upper portion of the pressure sensitive passage 27.

  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 pressure on the primary side is a predetermined value (the pressure limit value of the valve body 10 or the passage component) to prevent the resin valve body 10 or the passage component from being destroyed by the pressure. A relief valve 50 that opens when the angle exceeds the lower fitting portion 20 </ b> C of the holder member 20 is provided.

  The relief valve 50 is provided with a relief valve port 51 composed of an orifice that opens into the valve chamber 21 (a portion of the cutout space 21a), and a stepped connection that is provided below the relief valve port 51 and opens into the outflow chamber 26. A large-diameter vertical hole 52, a spring receiving lid 54 with a through hole 53 inserted and fixed to the lower portion of the vertical hole 52, a ball valve body 55 made of rubber, for example, for opening and closing the relief valve port 51, and the ball And a valve closing spring 56 formed of a compression coil spring that urges the valve body 55 in the valve closing direction. The spring receiving lid 54 is fixed to the lower end portion of the vertical hole 52 by ultrasonic welding similarly to the large-diameter fitting insertion hole 16a of the bottomed cylindrical portion 16 and the fitting portion 20a of the holder member 20 described above.

  In the pressure reducing valve 1 of this embodiment having such a configuration, the relief valve 50 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 50 is not the diaphragm 41 side as in the conventional example, but the side opposite to the diaphragm 41, and the primary side pressure exceeds the predetermined value (predetermined pressure). Is configured to escape to the secondary side outlet 12 via the outflow chamber 26 close to the secondary side outlet 12 (not the pressure sensing chamber 24 as in the conventional example) via the relief valve 50. When the relief valve 50 is opened, the influence on the diaphragm device 50 is small. 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.

  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 in which the inlets 11a and 11b open, 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, since the valve body of the relief valve 50 is composed of the rubber ball valve body 55, it is possible to obtain 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.

  The ball valve body 55 may be made of any material other than rubber, that is, resin, metal, or the like.

DESCRIPTION OF SYMBOLS 1 Pressure-reducing valve 10 Valve main body 11 Primary side inlet 12 Secondary side outlet 15 Housing member 16 Bottomed cylindrical part 19 Guide hole 20 Holder member 21 Valve chamber 22 Valve port 23 Valve seat 24 Pressure sensing chamber 26 Outflow chamber 30 Valve Rod 35 Valve body 40 Diaphragm device 41 Diaphragm 50 Relief valve 55 Ball valve body

Claims (7)

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 responsive member attached to the upper portion of the valve body so as to close the upper surface opening of the valve body so as to open and close the valve stem in the vertical direction. A pressure reducing valve provided with a pressure sensing chamber for allowing the pressure sensitive reaction member to sense a secondary pressure between the pressure sensitive reaction member;
A pressure-reducing valve, wherein a relief valve is provided at a specific part of the valve body to release the primary pressure to the outflow chamber when the primary pressure exceeds a predetermined value.   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, 2. The pressure reducing valve according to claim 1, wherein the pressure reducing valve is divided into a guide hole into which the valve stem is slidably inserted and a resin holder member provided with the valve chamber.   The pressure reducing valve according to claim 2, wherein the relief valve is provided in the holder member, and the outflow chamber is defined between the holder member and a bottom portion of the bottomed cylindrical portion.   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 biases the ball valve body in a valve closing direction. The pressure reducing valve according to any one of claims 1 to 3.   The pressure reducing valve according to any one of claims 2 to 4, 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. 6. The pressure reducing valve according to claim 1, further comprising a side pressing member, wherein the lower pressing member is 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 The pressure-reducing valve according to claim 1, wherein a female screw portion to which the screw is screwed is formed.

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