JP2003076428A - Pressure reducing valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure reducing valve capable of having a large opening and closing stroke of a valve element to secure a large flow. SOLUTION: This pressure reducing valve has a main body 10 having a liquid passage 16 in the pipe axial direction inside thereof, a partition wall 18 provided in the main body 10 to divide the liquid passage 16 into a primary liquid passage 16A and a secondary passage 16B, and the valve element 24 for opening and closing a valve opening 20 by seating or separating a valve part 26 in relation to a valve seat 22 provided in the periphery of the valve opening 20 of the partition wall 18. The valve element 24 is provided with a piston part 30, and the piston part 30 is fitted in the inner surface of a cylinder part 36 freely to slide, and a pressure leading chamber 40 is formed between the piston part 30 and a bottom part of the cylinder part 36, and the pressure leading chamber 40 is communicated with the liquid passage 16 through a communication hole 42 provided in the valve element 24.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure reducing valve device, and more particularly, to a pressure reducing valve device of a type in which a valve element is driven using a diaphragm. 2. Description of the Related Art Conventionally, this kind of pressure reducing valve device has been used for various purposes. FIG. 2 shows an example of the use of the pressure reducing valve device. The illustrated example is an example of a case where the primary side water supply pressure is reduced to supply water to the electric water heater 200 when water is supplied. In the figure, reference numeral 200 denotes an electric water heater, and 202 denotes a pressure reducing valve device. I have. [0003] The inlet side of the pressure reducing valve device 202 is connected to a primary side water supply pipe 206 extending from a water stopcock 204, and the outlet side is connected to a secondary side connected to an electric water heater 200. Are connected. The water supplied through the water supply pipe 206 on the primary side is supplied to the pressure reducing valve device 2.
The electric water is supplied to the electric water heater 200 through the water supply pipe 208 on the secondary side via 02. A further secondary water supply pipe 210 extends from the outflow side of the pressure reducing valve device 202, and the distal end thereof is connected to the water-side connection port 214 of the hot and cold water mixing faucet 212. [0004] From the electric water heater 200, a hot water supply pipe 216 is also provided.
The distal end is connected to the hot water side connection port 218 of the hot and cold water mixing faucet 212. Incidentally, reference numeral 220 denotes a relief valve for releasing expansion water from the electric water heater 200,
It is provided on a branch pipe 222 from the water supply pipe 208 on the secondary side. The overflow water from the relief valve 220 is discharged to the discharge pipe 224.
Is discharged through. FIG. 3 shows an example of this type of pressure reducing valve device. In the figure, reference numeral 225 denotes a metal tubular main body, which has a liquid passage 228 in the axial direction in which the liquid flowing from the inlet 226 flows toward the outlet 227. [0006] A partition 23 is provided inside the main body 225.
0 is provided, and the liquid passage 2 is formed by the partition wall 230.
28 are a primary side liquid passage 228A and a secondary side liquid passage 228.
B. The partition 230 has a valve opening 232
And a valve seat 234 therearound, and the valve opening 232 is opened and closed by a valve body 236. The valve body 236 includes a valve portion 238 having a diameter larger than that of the valve opening 232 and a valve shaft 240 inserted through the valve opening 232 and extending upward in the drawing. A piston portion 244 is provided integrally with the valve shaft 240, and the piston portion 244 is fitted slidably in the vertical direction, that is, in the valve shaft 240 direction, on the inner surface of the cylinder portion 242 provided on the partition wall 230. I have. An O-ring 246 is mounted on the outer peripheral surface of the piston portion 244. The O-ring 246 comes into close contact with the inner surface of the cylinder portion 242, and
And the cylinder portion 242 are sealed in a liquid-tight manner. Reference numeral 248 denotes a diaphragm for driving the valve body 236, which is stretched in a direction parallel to the tube axis of the main body 225, and whose outer peripheral portion is fixed to the main body 225. A valve body 236 is fixed to a central portion thereof with a screw member 249. That is, the valve 236 and the diaphragm 24
8 are operatively connected. A pressure chamber 250 is formed inside the diaphragm 248 in the direction perpendicular to the axis. The pressure chamber 250
It communicates with the secondary-side liquid passage 228B through the communication port 252, and the liquid pressure in the secondary-side liquid passage 228B is guided to the pressure chamber 250. The diaphragm 248 has a pressure chamber 250
The valve body 236 is pulled upward in the figure based on the displacement, and the valve portion 238 is seated on the valve seat 234 to close the valve opening 232. . That is, the valve body 236 performs the valve closing operation. Reference numeral 253 denotes a metal cover having a spring accommodating chamber 254 formed therein, in which a compression coil spring 256 is accommodated. One end of the spring 256 is in contact with the diaphragm 248, and the biasing force acts on the diaphragm 248 inward in the direction perpendicular to the axis. That is, the valve body 236 is urged downward through the diaphragm 248, that is, in the valve opening direction. An opening 258 is provided in the tube wall of the main body 225, and the opening 258 is closed by a stopper 260. Here, opening 258 is valve opening 232
The valve member 236 is provided on the same side as the valve portion 238 and on the side opposite to the valve shaft 240. The opening 258 is for incorporating the valve body 236 upward from the lower side in the figure into the inside of the main body 225, or for taking out the lower side in the figure, and has a larger diameter than the valve portion 238. As is apparent from the drawing, the diaphragm 248 is disposed on the opposite side of the valve opening 232 from the valve portion 236. Cover 253 and spring 256
The same is true for In addition, 262 is from the inlet 226 to the outlet 2
This is a check valve for permitting only the forward flow (the direction of the arrow in the figure) toward 27. In the case of this pressure reducing valve device 202, the inflow port 22
6 flows through the internal liquid passage 228 and flows out from the outlet 227. And the secondary side liquid passage 228B
When the internal pressure reaches a certain pressure, the diaphragm 248 is pushed upward in the drawing based on the pressure, whereby the valve element 236 is pulled upward in the drawing, and the valve portion 238 is seated on the valve seat 234, The valve opening 232 is closed. This prevents the pressure in the secondary-side liquid passage 228B from rising to a certain pressure or higher. SUMMARY OF THE INVENTION In view of the above circumstances, the present invention is to provide a pressure reducing valve device which can take a large opening / closing stroke of a valve body and can take a large flow rate. Things. According to the present invention, there is provided a pressure reducing valve device comprising: (a) a main body having a tubular shape and having a liquid passage in a pipe axial direction therein; and (b) a main body. Provided in the
A partition partitioning the liquid passage into a primary-side liquid passage and a secondary-side liquid passage; and (c) a valve portion seated or separated from a valve seat provided around a valve opening of the partition. And a valve body for opening and closing the valve opening, wherein the valve body is provided with a piston portion, the piston portion is slidably fitted to the inner surface of the cylinder portion, and the piston A pressure guiding chamber is formed between the portion and the bottom of the cylinder portion, and the pressure guiding chamber communicates with the liquid passage through a communication hole provided in the valve body. As described above, according to the present invention, the piston is provided on the valve body, which is slidably fitted on the inner surface of the cylinder, and the piston is connected to the bottom of the cylinder. Between the pressure guiding chamber and the liquid passage through the communication hole provided in the valve body, so that the opening and closing stroke of the valve body can be increased. This has the advantage that the flow rate in the pressure reducing valve device can be increased. Next, an embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 10 denotes a tubular main body in the pressure reducing valve device of the present embodiment, which has a liquid passage 16 in a pipe axial direction through which a liquid (water in this example) flowing from an inlet 12 flows toward an outlet 14. Have. Body 10
A partition 18 is provided in the inside, and the partition 18 partitions the liquid passage 16 into a primary-side liquid passage 16A and a secondary-side liquid passage 16B. The partition 18 is provided with a valve opening 20 and a valve seat 22 therearound. The valve opening 20 is opened and closed by a valve element 24. The valve body 24 has a valve portion 26 having a larger diameter than the valve opening 20, a valve shaft 28, and a piston portion 30 provided integrally with the valve shaft 28. The valve opening 20 is opened and closed by sitting on or away from 22. An opening 32 having a larger diameter than the valve portion 26 is formed in the main body 10 on the same side as the valve body 24 including the valve portion 26 with respect to the valve opening 20. It is closed at 34. Here, the plug 34 has a large-diameter flange portion, and the flange portion is fitted into the opening 32 inward from the outside in the direction perpendicular to the axis in a state in which the flange portion contacts the outer surface of the tube wall of the main body 10. 10 is attached. The plug 34 has a cylindrical cylinder portion 36.
The piston portion 30 is slidably and liquid-tightly fitted to the inner surface of the cylinder portion 36 via an O-ring 38 for sealing. A pressure guiding chamber 40 is formed between the piston part 30 and the bottom of the cylinder part 36. The pressure guiding chamber 40 is connected to a liquid passage through a communication hole 42 provided in the valve body 24. It communicates with 16. That is, the liquid passage 16 is
The pressure inside is guided. Note that the valve shaft 28 of the valve body 24 penetrates a through hole 49 formed in the plug body 34, and its tip protrudes outward. Outside of the main body 10 (outside in the direction perpendicular to the axis)
, A spring chamber 45 is formed inside a peripheral wall portion 44 provided so as to rise from the outer surface of the tube wall of the main body 10, and a compression coil spring 46 is housed therein. At the end of the peripheral wall portion 44, the main body 1
Diaphragm 48 oriented parallel to the tube axis direction
Is fixed at its outer periphery, and the plug 34
Is operatively connected to the valve shaft 28 of the valve element 24 which protrudes through the valve body 24. The downward displacement of the diaphragm 48 in the figure, that is, the inward displacement in the direction perpendicular to the axis, causes the valve body 24 to be pressed downward against the valve seat 22 in the figure. That is, the valve body 24 performs a valve closing operation. On the other hand, one end (upper end in the figure) of a compression coil spring 46 housed in the spring chamber 45 is in contact with the diaphragm 48, and exerts its urging force upward. That is, the diaphragm 48 is urged outward in the direction perpendicular to the axis in the direction to open the valve element 24. Outside the diaphragm 48 in the direction perpendicular to the axis,
A pressure chamber 52 is formed which is surrounded by the diaphragm 48 and the bulging cover 50. This pressure chamber 52
A communication pipe 5 extending outward from the pipe wall of the main body 10
4 communicates with the liquid passage 16B on the secondary side,
The pressure on the secondary side is led to the pressure chamber 52 via the communication passage 56. In the case of the pressure reducing valve device of the present embodiment, the liquid flowing from the inlet 12 flows through the primary liquid passage 16A, passes through the valve opening 20, and reaches the secondary liquid passage 16B. Further, it flows through the liquid passage 16B and flows out from the outlet 14. When the pressure in the liquid passage 16B on the secondary side increases to a predetermined pressure, the pressure in the pressure chamber 52 causes the diaphragm 48 to be displaced downward in the drawing, that is, inward in the direction perpendicular to the axis, and the valve element 24 Is pushed downward and the valve section 2
6 rests on a valve seat 22 around the valve opening 20 and closes the valve opening 20. On the other hand, the spring 4
When the biasing force of 6 is overcome, the valve element 24 moves upward in the figure and opens the valve opening 20 here. In this pressure reducing valve device, the valve body 24 and the plug body 34 can be assembled to the main body 10 only from the upper side in the figure, and similarly, the diaphragm 48 and the spring 4
6, the cover 50 can be assembled from the same side to form the entire pressure reducing valve device. When the need arises, the cover 50, the diaphragm 48, the plug 34,
The valve body 24 can be removed. Therefore, in the case of the pressure reducing valve device of the present embodiment, assembly and removal of each member can be performed extremely easily. In the case of the pressure reducing valve device of the present embodiment, the entire structure including the structure of the liquid passage 16 inside the main body 10 or the partition 18 for forming the same can be simplified, so that the weight can be reduced and the cost can be reduced. Can be reduced. When assembling the valve body 24, the opening 32 is provided only on one side of the tube wall of the main body 10, and the entire assembly including the assembly of the valve body 24 or its removal is performed. The maintenance work including the above can be easily performed. In this embodiment, a pressure chamber 52 is provided outside the tube wall of the main body 10 so that the liquid passage 16 on the secondary side is provided.
Since the communication pipe 54 for guiding the pressure of B to the pressure chamber 52 is provided so as to extend outward from the pipe wall, the pressure chamber 52 for pressing the diaphragm 48 inward in the direction perpendicular to the axis can be easily formed. Can be formed. Further, while the cylinder body 36 is provided on the plug 34, the piston part 30 is provided on the valve body 24, which is slidably fitted on the inner surface of the cylinder part 36, and the piston part 30 and the bottom part of the cylinder part 36 are provided. Between the pressure guiding chamber 40 and the communication hole 42
The opening and closing stroke of the valve element 24 can be increased, and the flow rate in the pressure reducing valve device can be increased. Although the embodiment of the present invention has been described in detail, this is merely an example, and the pressure reducing valve device of the present invention can be used in various applications or in various places other than that shown in FIG. The present invention can be configured in variously modified forms without departing from the gist of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a pressure reducing valve device according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of use of a pressure reducing valve device. FIG. 3 is a diagram showing an example of a conventional pressure reducing valve device. DESCRIPTION OF SYMBOLS 10 Body 16 Liquid passage 16A Primary liquid passage 16B Secondary liquid passage 18 Partition wall 20 Valve opening 22 Valve seat 24 Valve element 26 Valve part 30 Piston part 32 Opening 34 Plug body 36 Cylinder part 40 pressure guiding chamber 42 communication hole 46 compression coil spring 48 diaphragm 52 pressure chamber 54 communication pipe

Claims (1)

Claims: 1. A main body having a tubular shape and having a liquid passage in a tube axial direction therein; and (b) a liquid passage provided in the main body and having a liquid passage on a primary side. (C) opening and closing the valve opening by seating or separating a valve portion with respect to a valve seat provided around the valve opening of the partition wall; A pressure reducing valve device having a valve body, wherein the valve body is provided with a piston portion, the piston portion is slidably fitted to an inner surface of the cylinder portion, and a bottom portion of the piston portion and the cylinder portion A pressure guiding chamber is formed between the valve body and the pressure guiding chamber, and the pressure guiding chamber communicates with the liquid passage through a communication hole provided in the valve body.