JPH0520107U - Water pressure reducing valve with water stop function - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a water pressure reducing valve with a water stop function that can stop water with a simple structure that combines two valves and can be installed in a narrow space. [Configuration] When the switching valve 28 is operated, the secondary side conduit 25 is closed, the communication between the secondary side chamber 6 and the diaphragm chamber 9 is cut off, and at the same time, the primary side conduit 24 is opened, and the primary side chamber 5 and the diaphragm are opened. The chamber 9 is brought into communication, and the fluid in the primary chamber 5 enters the diaphragm chamber 9. With this fluid, the diaphragm is pushed up against the elastic force of the adjusting spring 13. As a result, the valve body 17 rises via the valve stem 18, and the valve opening 7
Close. As a result, the fluid on the primary side is stopped and does not flow to the secondary side. [Effect] The original decompression function and water stop function can be provided, and since only one valve is required, the structure becomes simpler and the overall size becomes compact.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a water pressure reducing valve having a temporary water stop function.

[0002]

[Prior Art]

 The pressure reducing valve is used to control the pressure of the fluid flowing in the fluid pipe, and a diaphragm type is often used. Examples of this pressure reducing valve include Japanese Utility Model Laid-Open No. 59-15863. The structure and operation of this pressure reducing valve will be described with reference to FIG. a is a valve seat, b is a valve body having a soft seat (a surface contacting with synthetic rubber), c is a diaphragm, d is a valve rod fixed to the valve body b, e is an adjusting spring, f is an adjusting screw, and g is a pressure reducing valve. A detection tube for introducing the pressure of the fluid on the secondary side of the valve into the diaphragm chamber h, i is a liner, j is a diaphragm retainer, and k is a communication port. In the unloaded state, the pressure reducing valve is such that the outer peripheral edge of the diaphragm retainer j abuts on the upper surface of the liner i due to the elastic force of the adjusting spring e and the weight of the valve rod d and the components attached thereto, and at the same time, the valve disc b Is fully opened by moving away from the valve seat a. When the fluid is sent to the primary side of the pressure reducing valve, the fluid passes between the valve seat a and the valve body b and reaches the secondary side. Here, if the sluice valve (not shown) on the secondary side is fully closed and fluid is not flowing, the fluid pressure on the secondary side gradually rises and passes through the detection tube g to the diaphragm chamber h. And acts upward on the diaphragm c to move the diaphragm c upward against the elastic force of the adjusting spring e and the own weight of the valve rod d and the components attached thereto, thus moving the valve body b. The pressure reducing valve is closed by being tightly attached to the valve seat a. Since the fluid pressure on the primary side acts upward on the upper surface of the valve element b, it does not affect the fluid pressure on the primary side. Then, when the adjusting screw f is rotated in the clockwise direction, the adjusting spring e is further compressed, the diaphragm c is lowered, the valve body b is pushed down, and the pressure reducing valve is opened. Therefore, the fluid on the primary side reaches the secondary side, the fluid pressure on the secondary side is introduced into the diaphragm chamber h through the detection pipe d, acts on the diaphragm c upward, and acts on the elastic force of the adjusting spring e. When they are in balance, they are in equilibrium. When the valve / plugs (not shown) on the secondary side are opened, the fluid pressure on the secondary side fluctuates depending on the load, that is, the flow rate. Therefore, the fluid pressure acting on the diaphragm c and the adjusting spring e work together. The opening of the valve element b is adjusted. Thus, the operation is performed so that the secondary side fluid pressure acting on the diaphragm c always balances with the elastic force of the adjusting spring e. That is, since the valve element b moves so as to reach the set pressure according to the change in the usage amount, the secondary side fluid pressure is kept constant regardless of the usage amount.

[0003]

[Problems to be solved by the device]

 By the way, when replacing or repairing valves, plugs, water meters (not shown), etc., installed on the secondary side of this pressure reducing valve, water is temporarily stopped and the pressure on the secondary side of the pressure reducing valve is stopped. It is necessary to empty the fluid on the zero side or the secondary side. In this case, the valve body of the pressure reducing valve loses its equilibrium state when the pressure on the secondary side is zero or when the fluid is discharged, so that the equilibrium state is broken and the valve is fully opened. Therefore, the fluid on the secondary side cannot be emptied. Therefore, if a water shutoff valve (plug) is provided separately from this pressure reducing valve and this water shutoff valve is shut off, it can be eliminated. However, as mentioned above, two valves, a pressure reducing valve and a water shutoff valve, are required. Therefore, it is expensive and if both valves are installed side by side, the valve face dimension of both valves becomes wide and mounting in a narrow space is possible There are problems such as difficult cases.

This invention has been made to solve the above-mentioned problems, and has a simple structure in which two valves are combined to stop water and to be installed in a narrow space. The purpose is to provide a valve.

[0005]

[Means for Solving the Problems]

 A water pressure reducing valve with a water stop function according to the present invention has an inlet and an outlet, and a primary side chamber on the inlet side and a secondary side chamber on the outlet side in a valve box in which a diaphragm chamber is formed. A partition wall is provided, a valve opening is provided in the partition wall, a diaphragm is provided at the opening of the diaphragm chamber through a protective cover, and an adjusting spring that presses the diaphragm through an adjusting bolt is provided in the protective cover. The diaphragm is provided with a valve body for opening and closing the valve opening via a valve rod, a primary side conduit is provided for communicating the primary side chamber with the diaphragm chamber, and a secondary side chamber is provided with the diaphragm chamber for communicating with the diaphragm chamber. The second side conduit is provided, and the switching valve is provided on both the conduits.

[0006]

[Action]

 By closing the primary side conduit and opening the secondary side conduit, the fluid on the primary side flows into the secondary side chamber while being decompressed when passing through the valve opening from the primary side chamber. When water is temporarily stopped from the above state, that is, when the pressure in the secondary chamber is zero or the fluid in the secondary chamber is emptied, when the switching valve is activated, the secondary conduit is closed and At the same time that the communication between the primary side chamber and the diaphragm chamber is opened, the fluid in the primary side chamber enters the diaphragm chamber. Due to the high fluid pressure on the primary side flowing into the diaphragm chamber, the diaphragm is pushed up against the elastic force of the adjusting spring. By this push-up, the valve body rises via the valve stem, the valve seat abuts, and the valve opening is closed. As a result, the fluid on the primary side is stopped and does not flow to the secondary side. Therefore, it is possible to replace and repair the valves / plugs and water meter on the secondary side. Next, when replacement and repair are completed and water is restored, the switching valve is switched to close the primary side conduit and when the communication between the primary side chamber and the diaphragm chamber is cut off, the secondary side conduit is opened. When opened, the secondary chamber and diaphragm chamber are in communication. Therefore, the pressure in the diaphragm chamber drops due to the communication with the secondary chamber. Due to this pressure drop, the diaphragm is pushed down by the pressing force of the adjusting spring. By this pushing down, the valve body is lowered via the valve stem and separated from the valve seat to open the valve opening. As the valve port opens, the fluid flows into the secondary chamber while reducing the pressure through the primary chamber and the valve port as described above, and returns to the original state. In this way, when the water is re-supplied after the water is stopped, the original condition is restored without readjusting, that is, without operating the adjusting screw.

[0007]

【Example】

 Examples will be described with reference to the drawings. 1 to 5, reference numeral 1 is a valve box having an inflow port 2 on one side and an outflow port 3 on the other side. This valve box is divided into a primary chamber 5 and a secondary chamber 6 by a partition wall 4, a valve port 7 is provided in the partition wall 4, and a valve seat 8 is provided in this valve port. Reference numeral 9 denotes a concave diaphragm chamber formed on the upper wall of the valve box 1, and a diaphragm 12 is provided in an opening 10 of the diaphragm chamber via a protective cover 11. Reference numeral 13 is an adjustment spring, one end of which is pressed against the diaphragm chamber 12 via the pressure receiving plate 14 and the other end of which is pressed by the adjustment bolt 16 screwed into the protective cover 11 via the seat plate 15. Reference numeral 17 is a valve element provided below the valve opening 7, and has a valve rod 18 on the upper side of this valve element, and the valve rod extends through the valve opening 7 and the upper wall of the valve box 1, The upper end is fixed to the lower surface of the diaphragm 12. A piston portion 19 is formed below the valve body 17, and the piston portion 19 is fitted into a cylinder portion 21 formed in the lower lid 20 of the valve box 1 via a spring 22. Reference numeral 23 is a packing fitted on the upper surface of the valve body 17. Reference numerals 24 and 25 denote a primary-side conduit that connects the primary-side chamber 5 and the diaphragm chamber 9 and a secondary-side conduit that communicates the secondary-side chamber 6 and the diaphragm chamber 9 formed in the thick portion 26 of the valve box 1. .. Although the end portion of the primary-side conducting path 24 is connected to the secondary-side conducting path 25 in the drawing, it may be directly connected to the diaphragm chamber 9. 27 is a switching valve for switching between the primary side pressure and the secondary side pressure. This switching valve comprises a solid valve body 29 fitted in a tubular portion 28 that crosses the conduits 24, 25 at a right angle, and a lever 30 for rotating this valve body. It has a primary-side communication port 31 and a secondary-side communication port 32 that communicate with the conduits 24 and 25, respectively, and both communication ports are oriented in a 90 ° staggered direction. Reference numeral 33 is a cover of the valve box 1, 34 is a telescopic tube connected to the outflow port 3 via a bag nut 35, 36 is a cap nut engaged with the telescopic tube 34, and 37 is a fluid in the valve box 1 in the cylinder portion 21. It is a guide hole leading to.

The operation of this embodiment will be described. The adjusting bolt 16 is adjusted so that a predetermined depressurized state (secondary pressure) is achieved, and the elastic force of the adjusting spring 13 is applied to the diaphragm 12. Further, the lever 30 of the switching valve 27 turns the solid valve body 29 to close and close the primary side conduit 24 by the solid valve body 29, and the secondary side conduit 25 to the secondary side communication port 32. Keep open with communication. Therefore, when no fluid is contained in the pressure reducing valve, the diaphragm 12 is pressed by the elastic force of the adjusting bar 13, and the pressing force of the diaphragm 12 is transmitted to the valve body 17 via the valve rod 18. Therefore, the valve body 17 is apart from the valve rod 18 and is in a fully open state. From this state, when the fluid is sent to the primary side chamber 5 via the inflow port 2, the fluid enters the secondary side chamber 6 through the valve port 7 and reaches the outflow port 3. Here, when the valves / plugs connected to the outflow port 3 via a pipe (not shown) are shut off (do not take water), the fluid gradually fills the secondary side chamber 6 and its pressure gradually rises. As this rises, it enters the diaphragm chamber 9 through the secondary side conduit 25, and the fluid pressure rises in the same manner. Due to this fluid pressure, the diaphragm 12 moves upward against the elastic force of the adjusting spring 13. Along with the movement of the diaphragm 12, the valve body 17 rises through the valve rod 18 to come into close contact with the valve seat 8 and close the valve opening 7. That is, it is fully opened. Next, when a valve / plug (not shown) is opened (water intake state), the pressure in the secondary chamber 25 and the pressure in the diaphragm chamber 9 drop, so that the valve element 17 starts to open and the fluid in the primary chamber 5 opens at the valve opening. It flows into the secondary side chamber 6 via 7. Then, as the fluid passes, the pressure on the secondary side is transmitted to the diaphragm chamber 9 through the secondary side conduit 25, and the upward force acts on the diaphragm 12, and the upward force and the elastic force of the adjusting spring 13 are balanced. Stop around and keep the opening. Therefore, the secondary pressure is kept constant in a depressurized state. The opening degree of the valve port 7 is adjusted by the adjusting spring 13, and the depressurizing pressure on the secondary side is set by this.

From the above state, when the water is temporarily stopped, that is, the pressure in the secondary chamber 6 is zero or the fluid in the secondary chamber 6 is emptied, the switching valve 27 is operated. That is, when the solid valve element 29 is rotated by the lever 30 of the switching valve 27, the primary side conduit 24 communicates with the primary side communication port 31 and opens, and the secondary side conduit 25 is shut off by the solid valve element 29. Switch to closed. As a result, the fluid in the primary chamber 5 enters the diaphragm chamber 9. The fluid on the primary side that has flowed into the diaphragm chamber 9 pushes up the diaphragm 12 against the elastic force of the adjusting spring 12 due to the fluid pressure. By this pushing up, the valve body 17 rises via the valve rod 18, the valve seat 8 is abutted, and the valve port 7 is closed. Therefore, the fluid on the primary side is reliably stopped by the high pressure, and does not flow from the valve port 7 to the secondary side. Therefore, it is possible to replace or repair valves, plugs, water meters, etc. (not shown) connected to the secondary side.

Next, when the replacement / repair is finished and the water flow state is restored, the solid valve element 29 is turned by the lever 30 of the switching valve 27, and the primary side conduit 24 is blocked by the solid valve element 29. And the secondary side conduit 25 communicates with the primary side communication port 32 and is switched to open. As a result, the communication between the primary chamber 5 and the diaphragm chamber 9 is cut off, and the secondary chamber 6 and the diaphragm chamber 9 are brought into communication with each other, so that the pressure in the diaphragm chamber 9 is lowered by the communication with the secondary chamber 6. Due to this pressure drop, the diaphragm 12 is pushed down by the pressing force of the adjusting spring 13. As a result, the valve element 17 is lowered via the valve rod 18 and separated from the valve seat 8 to open the valve opening 7. As the valve opening 7 opens, it flows into the secondary side chamber 6 while reducing the pressure through the primary side chamber 5 and the valve opening 7 as described above, and the original water flow state is established. In this way, when water is re-supplied after the water is stopped, the original state is restored without operating the adjusting screw 16.

Although the conduits 24 and 25 are provided in the thick portion 26 of the valve box 1 in the above embodiment, the thick portions are omitted and the primary side chamber and the diaphragm chamber and the secondary side chamber and the diaphragm chamber are respectively provided. A conduit not shown may be used for communication, and a switching valve such as a cock valve may be provided in this conduit. This pressure reducing valve can be used in place of the water stopcock installed in each home.

[0012]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. A partition wall for partitioning the primary side chamber on the inlet side and the secondary side chamber on the outlet side is provided in a valve box having an inflow port and an outflow port, and a diaphragm chamber formed in the upper part, and a valve port is provided in this partition wall. A diaphragm chamber is provided in the opening of the diaphragm chamber via a protective cover, an adjusting spring for pressing the diaphragm is provided in the protective cover via an adjusting bolt, and the diaphragm is opened and closed via a valve rod. Is provided, a primary side conduit that connects the primary side chamber and the diaphragm chamber is provided, and a secondary side conduit that connects the secondary side chamber and the diaphragm chamber is provided. Since the changeover valve is provided, the original decompression function and water stop function can be provided, and since only one valve is required, the structure becomes simpler and the overall size becomes compact.

Further, when the water is temporarily stopped and then returned to the original state, it is possible to return to the original setting without readjusting by simply switching the switching valve. Furthermore, since the valve face is almost the same as the conventional one, it can be installed in a narrow space.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a water passing state of a water pressure reducing valve with a water stop function according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of the same.

3 is a sectional view taken along line AA of FIG.

FIG. 4 is a longitudinal sectional front view showing a water stop state of a water pressure reducing valve with a water stop function according to an embodiment of the present invention.

FIG. 5 is a vertical sectional side view of the above.

FIG. 6 is a cross-sectional view showing a conventional pressure reducing valve.

[Explanation of symbols]

1 valve box 2 inlet
3 Outlet 4 Partition 5 Primary chamber
6 Secondary side chamber 7 Valve mouth 9 Diaphragm chamber
10 Opening 11 Protective Cover 12 Diaphragm
13 adjusting spring 16 adjusting bolt 17 valve body
18 valve rod 24 primary side conduit 25 secondary side conduit
27 switching valve

Claims (1)

[Scope of utility model registration request] 1. A partition for partitioning a primary side chamber on the inlet side and a secondary side chamber on the outlet side is provided in a valve box having an inlet and an outlet, and a diaphragm chamber formed in the upper part, and the partition is A valve opening is provided, a diaphragm is provided in the opening of the diaphragm chamber via a protective cover, an adjusting spring for pressing the diaphragm is provided in the protective cover via an adjusting bolt, and the valve is provided to the diaphragm via a valve rod. A valve body that opens and closes the mouth is provided, a primary side conduit that connects the primary side chamber and the diaphragm chamber is provided, and a secondary side conduit that communicates the secondary side chamber and the diaphragm chamber is provided. A water pressure reducing valve with a water stop function, characterized by a switching valve provided in the passage.