JP2019002511A - Pressure regulating valve and automatic valve device employing the same - Google Patents

Abstract

To provide a pressure regulating valve capable of avoiding occurrence of a situation that a main valve cannot be closed, by suppressing clogging of a foreign substance or generation of a product material, and an automatic valve device employing the same.SOLUTION: A pressure regulating valve comprises: a primary pressure introduction chamber; a secondary pressure introduction chamber; a valve part which opens/closes the primary pressure introduction chamber in atmospheric air; a communication path communicating the primary pressure introduction chamber and the secondary pressure introduction chamber; a communication control mechanism which is provided in the communication path and controls opening/closing of the communication path; and a valve drive mechanism which opens the valve part when a secondary pressure within the secondary pressure introduction chamber reaches a first pressure, and closes the valve part when the secondary pressure within the secondary pressure introduction chamber is lower than the first pressure. The communication control mechanism is configured to close the communication path when a primary pressure within the primary pressure introduction chamber exceeds a second pressure, and to cancel the closing of the communication path when the primary pressure within the primary pressure introduction chamber becomes lower than the second pressure.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a pressure regulating valve and an automatic valve device using the pressure regulating valve.

  When a conventional watering system is used for a tunnel, a fire prevention zone is set by dividing the longitudinal direction of the tunnel into a predetermined distance, and a fire prevention zone including the source of the fire is specified at the time of a fire, and the entire fire prevention zone is defined. Sprinkle water. In this watering system, the main pipe connected to the pressurized water supply source is buried and laid in the tunnel, and in each fire prevention section, the branch pipe branches off from the main pipe and rises along the side wall of the tunnel, and water is discharged at the tip. The head is connected. The required number of water discharge heads is provided according to the size of the fire prevention compartment. Each branch pipe is provided with a gate valve, and further, an automatic valve device is provided on the secondary side thereof. This automatic valve device opens when a fire occurs and supplies pressurized water to the water discharge head, and closes after the fire is extinguished to stop the supply of pressurized water to the water discharge head.

  Such a conventional automatic valve device includes an automatic valve that supplies pressurized water to the water discharge head, an actuator that opens and closes the valve body of the automatic valve, a pressure adjustment valve that supplies pressurized water for driving adjusted to a predetermined pressure to the actuator, An automatic drain valve that drains the pressurized water of the actuator via the pressure adjustment valve in a state where the supply of the pressurized water to the actuator is stopped is provided (for example, see Patent Document 1).

JP 2010-5240 A

  In the conventional automatic valve device, when the water discharge from the water discharge head is finished and the supply of the pressurized water to the actuator is stopped, the pressurized water in the actuator enters the pressure adjusting valve, passes through the orifice, Move to the room on the piping side. Next, it flows out from the pressure regulating valve to the pipe, flows through the pipe and is drained from the automatic drain valve to the drain, the pressure in the actuator is lowered, and the valve body of the automatic valve is closed.

  The orifice in the pressure regulating valve does not affect the operation of the actuator when adjusting the pressure by the actuator, and does not cause excessive water hammer when draining the pressurized water of the actuator in order to close the main valve after the end of water discharge. In order not to generate, it was adjusted to a minute gap. Therefore, foreign matter in the pressurized water is clogged in the orifice, and further, a product is produced in the orifice. In the worst case, the valve body of the automatic valve cannot be closed.

  The present invention has been made in order to solve the above-described problems, and a pressure regulating valve capable of preventing clogging of foreign matters and generation of a product and avoiding a situation in which a main valve of an automatic valve cannot be closed, and a pressure regulating valve for the same. It aims at obtaining the used automatic valve apparatus.

  A pressure regulating valve according to the present invention communicates a primary pressure introduction chamber, a secondary pressure introduction chamber, a valve portion that opens and closes the primary pressure introduction chamber to the atmosphere, and the primary pressure introduction chamber and the secondary pressure introduction chamber. A communication path that is provided in the communication path and controls the opening and closing of the communication path, and when the secondary pressure in the secondary pressure introduction chamber reaches the first pressure, the valve portion is opened. A valve drive mechanism that closes the valve when the secondary pressure in the secondary pressure introduction chamber is less than the first pressure, and the communication control mechanism has a second primary pressure in the primary pressure introduction chamber. When the pressure is exceeded, the communication passage is closed, and when the primary pressure in the primary pressure introduction chamber becomes lower than the second pressure, the communication passage is unclosed.

  According to the present invention, the communication control mechanism is movable so as to close / release the communication path in accordance with the primary pressure in the primary pressure introduction chamber, so that generation of products and clogging of foreign matters are suppressed. Thus, in an automatic valve device equipped with this pressure regulating valve, it is possible to avoid the occurrence of a situation where the main valve of the automatic valve cannot be closed.

It is a schematic block diagram which shows the automatic valve apparatus which concerns on Embodiment 1 of this invention. It is a figure explaining the raise operation | movement of the secondary side pressure at the time of water discharge in the automatic valve apparatus which concerns on Embodiment 1 of this invention. It is a figure explaining the fall operation | movement of the secondary side pressure at the time of water discharge in the automatic valve apparatus which concerns on Embodiment 1 of this invention. It is a figure explaining the water discharge stop operation | movement in the automatic valve apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the pressure control valve which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the pressure control valve which concerns on Embodiment 1 of this invention. It is principal part sectional drawing which shows the communication control mechanism periphery of the pressure regulating valve which concerns on Embodiment 1 of this invention. It is a side view which shows the movable valve body of the pressure regulating valve which concerns on Embodiment 1 of this invention. It is IX-IX arrow sectional drawing of FIG. It is principal part sectional drawing explaining the operation | movement of the pressure control valve at the time of automatic valve apparatus opening concerning Embodiment 1 of this invention. It is principal part sectional drawing explaining operation | movement of the pressure regulation valve at the time of the automatic valve apparatus closing based on Embodiment 1 of this invention. It is sectional drawing of the movable valve body applied to the communication control mechanism of the pressure regulating valve which concerns on Embodiment 2 of this invention. It is sectional drawing of the movable valve body applied to the communication control mechanism of the pressure regulating valve which concerns on Embodiment 3 of this invention.

  Hereinafter, preferred embodiments of an automatic valve device of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is a schematic configuration diagram showing an automatic valve device according to Embodiment 1 of the present invention.
In FIG. 1, the automatic valve device changes the opening degree of the main valve 7 to adjust the flow rate of primary pressurized water flowing from the primary side flow path 2 to the secondary side flow path 3, and the automatic valve 100. The primary valve 7 is supplied to the main valve drive mechanism of the main valve 7 to start the automatic valve device, and the opening of the main valve 7 is controlled so that the pressure of the secondary pressurized water becomes a predetermined pressure. The pressure regulating valve 400 is arranged on the secondary side of the automatic valve 100, and is opened from the water discharge head 16 during normal times such as water discharge, and is not discharged from the water discharge head 16 and is closed when the automatic valve 100 is tested. Water control valve 25, drainage unit 300 for draining the secondary side pressurized water in the secondary side flow path 3, and when the pressure of the secondary side pressurized water of the automatic valve 100 exceeds a predetermined water discharge pressure, the water discharge signal is monitored. And a pressure switch 20 for transmitting to

  In this automatic valve device, the primary flow path 2 of the automatic valve 100 is connected to the main pipe (not shown), the secondary flow path 3 is connected to the secondary pipe 15 via the water control valve 25, A water discharge head 16 is provided in the secondary side pipe 15. In the automatic valve device, when the fire occurs, the automatic valve 100 opens to supply pressurized water to the water discharge head 16, closes after the fire is extinguished, and stops the supply of pressurized water to the water discharge head 16.

First, the structure of the automatic valve 100 will be described.
The automatic valve 100 includes a trunk portion 1 including a trunk main body 1a and primary and secondary pipes 1b and 1c that are coaxially disposed on both sides of the trunk main body 1a. The trunk body 1a has a circular cross-sectional shape perpendicular to the axes of the primary and secondary pipes 1b and 1c (hereinafter referred to as the trunk axis) arranged coaxially, and the circular cross section. The diameter is gradually increased from the primary side pipe line 1b toward the secondary side pipe line 1c, and is formed into a bulging body shape having an outer shape that gradually decreases through a maximum value.

  An isolation wall 4 is disposed so as to divide the body portion 1 into a primary flow path 2 and a secondary flow path 3. A communication hole 5 is formed in the isolation wall 4 so as to communicate the primary side flow path 2 and the secondary side flow path 3. Primary side pressurized water is supplied to the primary side flow path 2 via the primary side pipe line 1b, and the secondary side flow path 3 is connected to the secondary side pipe 15 via the secondary side pipe line 1c. The cylindrical cylinder 6 opens in the secondary side flow path 3 with the axial center aligned with the hole center of the communication hole 5 and facing the communication hole 5 across the secondary side flow path 3. It is formed in the trunk | drum main-body part 1a. The cylinder 6 has a circular cross section of the trunk main body 1a projecting from a portion having the maximum diameter with the axis of the cylinder 6 orthogonal to the axis of the trunk 1.

  The main valve 7 is disposed in the primary flow path 2 of the body part 1 at a valve seat 4a formed at the outer peripheral edge of the communication hole 5 so as to be able to contact and separate in a direction perpendicular to the axis of the body part 1. . Further, a spring 8 as an urging means is contracted in the primary flow path 2 so as to press the main valve 7 toward the secondary flow path 3 (valve seat 4a). As a result, the main valve 7 is in close contact with the valve seat 4 a and closes the flow path between the primary flow path 2 and the secondary flow path 3.

  The piston 9 is slidably inserted into the cylinder 6, the O-ring 10 is fitted on the outer periphery of the piston 9, and the inside of the cylinder 6 is connected to the piston chamber 6 a on the secondary side flow path 3 side and the secondary side flow path. 3 and a working chamber 6b on the opposite side. Furthermore, the stem 11 is attached so that one end is fixed at the center position of the piston 9 and the other end is fixed at the center position of the main valve 7, and the axial center thereof coincides with the axial center of the cylinder 6. Here, the main valve drive mechanism is constituted by the cylinder 6, the spring 8, the piston 9, the stem 11, and the like. The axis of the cylinder 6 coincides with the contact / separation direction of the main valve 7.

The start valve 200 includes a pilot valve 18 and a manual start valve 19 and is disposed in parallel with the first pipe 30. A stop valve 17 is disposed on the upstream side of the start valve 200 in the first pipe 30.
The water control valve 25 is attached to the secondary side pipe line 1 c of the body portion 1 using a water control valve mounting flange 27.
The drainage unit 300 includes an automatic drain valve 21 and a manual ball valve 22, and is disposed in the second pipe 31. A pressure switch 20 is disposed in the second pipe 31.

  Next, the structure and operation of the pressure regulating valve 400 will be described with reference to FIGS. 5 and 6 are sectional views showing the pressure regulating valve according to Embodiment 1 of the present invention, respectively, and FIG. 7 is a sectional view of the main part showing the communication control mechanism of the pressure regulating valve according to Embodiment 1 of the present invention. 8 is a side view showing the movable valve body of the pressure regulating valve according to the first embodiment of the present invention, FIG. 9 is a sectional view taken along arrow IX-IX in FIG. 8, and FIG. 10 is a diagram according to the first embodiment of the present invention. FIG. 11 is a fragmentary cross-sectional view for explaining the operation of the pressure regulating valve when the automatic valve device is closed according to Embodiment 1 of the present invention. It is.

  The pressure regulating valve 400 is configured such that a diaphragm 40 is held by a diaphragm holder 41 and is sandwiched between a spring case 42 and a valve body 46. The spring case 42 is formed in a bottomed cylindrical shape. A spring 43 that applies a spring load for setting a prescribed pressure on the secondary side of the automatic valve 100 is contracted between the spring seat 44 and the diaphragm holder 41. Further, the pressure adjusting bolt 45 is screwed so as to penetrate the top of the spring case 42, and the amount of contraction of the spring 43 can be reduced by adjusting the amount of extension of the pressure adjusting bolt 45 into the spring case 42. Adjustable, spring load can be adjusted.

  The valve body 46 includes a secondary pressure introduction chamber 47 defined by the diaphragm 40, a secondary pressure introduction port 48 for introducing secondary pressurized water into the secondary pressure introduction chamber 47, a primary pressure introduction chamber 49, A primary pressure introduction port 50 that introduces primary-side pressurized water into the primary pressure introduction chamber 49, a communication passage 51 that communicates the secondary pressure introduction chamber 47 and the primary pressure introduction chamber 49, and a communication between the primary pressure introduction chamber 49 and the atmosphere. A drain port 52 is formed. Further, the valve body 46 is formed with a communication hole 58 constituting a part of the communication passage 51 so as to open to the primary pressure introduction chamber 49, and the valve seat 59 is located on the primary pressure introduction chamber 49 side of the communication hole 58. An annular protrusion is provided on the outer periphery so as to surround the communication hole 58.

  One end of the shaft 53 is fixed to the diaphragm holder 41, passes through the secondary pressure introduction chamber 47, passes through the valve body 46, and extends into the primary pressure introduction chamber 49. It is configured to be able to reciprocate in conjunction with the displacement. In addition, an O-ring 57 is attached to a through portion of the valve body 46 of the shaft rod 53, and a seal between the secondary pressure introduction chamber 47 and the primary pressure introduction chamber 49 is secured.

The plug 55 is manufactured in a bottomed cylindrical shape, and is fitted and held in the drain port 52 of the valve body 46 with the bottom side facing the primary pressure introduction chamber 49. A valve seat 56 having a predetermined diameter is formed at the bottom of the plug 55, and the valve body 54 formed at the tip of the shaft rod 53 can be brought into and out of contact with the valve seat 56 by the reciprocating movement of the shaft rod 53. Yes.
Here, the valve body 54 and the valve seat 56 constitute a valve portion. The valve body 54 is made in a conical shape and is arranged coaxially with the valve seat 56. Further, the diaphragm 40, the spring case 42, the spring 43, the shaft rod 53 and the like constitute a valve drive mechanism.

  The communication control mechanism 60 includes, for example, a movable valve body 61 made of a material having excellent corrosion resistance and slidability such as polytetrafluoroethylene, and a spring 63. The movable valve body 61 is provided at a shaft portion 61a having a slightly smaller diameter than the communication hole 58 and at one end of the shaft portion 61a, and has a disk-shaped first flange portion 61b having a larger diameter than the valve seat 59, and a shaft portion 61a. A disc-shaped second flange portion 61 c provided at the other end and having a diameter larger than that of the communication hole 58. A plurality of protrusions 62 are formed at an equiangular pitch on the outer peripheral portion of the surface of the second flange portion 61c facing the first flange portion 61b.

  The movable valve body 61 is disposed in the valve body 46 such that the shaft portion 61a is passed through the communication hole 58 and the first flange portion 61b is disposed in the primary pressure introduction chamber 49 so as to be reciprocally movable in the hole direction of the communication hole 58. Has been. The spring 63 is attached to the shaft portion 61a and disposed on the inner peripheral side of the valve seat 59, and urges the movable valve body 61 toward the primary pressure introduction chamber 49.

  When the primary pressure P1 in the primary pressure introduction chamber 49 exceeds the sum (second pressure) of the urging force of the spring 63 and the secondary pressure P2 in the secondary pressure introduction chamber 47, the communication control mechanism 60 is shown in FIG. As shown, the first flange portion 61b comes into contact with the valve seat 59 and enters a closed state. Further, when the sum (second pressure) of the urging force of the spring 63 and the secondary pressure P2 in the secondary pressure introduction chamber 47 exceeds the primary pressure P1 in the primary pressure introduction chamber 49, as shown in FIG. The protrusion 62 comes into contact with the opening edge of the communication hole 58 on the side of the communication path 51 to enter the closed state. When the primary pressure P <b> 1 is higher than the secondary pressure P <b> 2, the primary pressurized water in the primary pressure introduction chamber 49 flows into the secondary pressure introduction chamber 47 through the gap formed by the protrusions 62. In this way, the communication control mechanism 60 opens and closes using the biasing force of the spring 63, the secondary pressure in the secondary pressure introduction chamber 47, and the primary pressure in the primary pressure introduction chamber 49 as operating forces.

  In the pressure adjustment valve 400 configured in this way, the amount of extension of the pressure adjusting bolt 45 into the spring case 42 is adjusted, and the spring load (first pressure) is adjusted to a set value. The diaphragm 40 is displaced toward the primary pressure introduction chamber 49 by a spring load acting via the diaphragm holder 41, and the valve body 54 comes into contact with the valve seat 56 and is in a closed state (initial state). That is, the pressure regulating valve 400 is a normally closed pressure regulating valve. Further, in the communication control mechanism 60, the movable valve element 61 is moved to the primary pressure introduction chamber 49 side by the urging force of the spring 63, and is in a closed release state.

  When the primary side pressurized water is introduced from the primary pressure introduction port 50 into the primary pressure introduction chamber 49, the pressure of the primary side pressurized water introduced into the primary pressure introduction chamber 49 acts on the first flange portion 61 b of the movable valve body 61. Then, the movable valve body 61 moves to the communication passage 51 side by the pressure of the primary side pressurized water, and the first flange portion 61 b comes into contact with the valve seat 59. As a result, the communication control mechanism 60 is closed. Then, the pressure in the primary pressure introduction chamber 49 rises to the primary pressure P1.

  The secondary pressurized water is introduced from the secondary pressure introduction port 48 into the secondary pressure introduction chamber 47, and the pressure in the secondary pressure introduction chamber 47 increases. When the pressure in the secondary pressure introducing chamber 47 exceeds the spring load, the diaphragm 40 is displaced toward the spring case 42, the valve element 54 is separated from the valve seat 56, and the valve is opened. As a result, the primary pressurized water introduced into the primary pressure introduction chamber 49 from the primary pressure introduction port 50 is discharged from the drain port 52. Then, the pressure in the working chamber 6b decreases, the piston 9 moves in a direction to reduce the volume of the working chamber 6b, and the flow path between the primary side flow path 2 and the secondary side flow path 3 becomes narrow. . And the flow volume of the primary side pressurized water which flows in into the secondary side flow path 3 decreases, and the pressure in the secondary side flow path 3 falls. As a result, when the pressure in the secondary pressure introduction chamber 47 decreases and is inferior to the spring load, the diaphragm 40 is displaced to the primary pressure introduction chamber 49 side, the valve body 54 comes into contact with the valve seat 56, and the valve is closed. Become. Thereby, discharge | release of the primary side pressurized water from the drainage port 52 is stopped, and the pressure in the working chamber 6b rises.

As will be described later, the pressure regulating valve 400 is opened when the pressure of the secondary side pressurized water in the secondary side flow path 3 reaches a predetermined pressure, and serves as a specified pressure setting mechanism for setting the specified pressure of water discharge. Function. And the regulation pressure of water discharge can be adjusted by adjusting a spring load.
Further, as will be described later, the pressure regulating valve 400 is released from the closed state after the communication control mechanism 60 stops water discharge, and the primary pressurized water in the working chamber 6b flows into the secondary pressure introducing chamber 47 through the gap formed by the protrusion 62. Thus, the main valve 7 functions as a valve closing mechanism of the main valve 7 after stopping water discharge.

Next, the piping system will be described.
One end of the first pipe 30 is connected to the primary flow path 2 of the automatic valve 100 via the start valve 200, and the other end is connected to the working chamber 6 b of the automatic valve 100. The second pipe 31 has one end connected to the secondary flow path 3 of the automatic valve 100 and the other end connected to the secondary pressure introduction chamber 47 of the pressure regulating valve 400. The third pipe 32 branches from the first pipe 30 and is connected to the primary pressure introduction port 50 of the pressure regulating valve 400. Note that the third pipe 32 may be directly connected to the working chamber 6 b without passing through the first pipe 30.

  Next, the operation of the automatic valve device configured as described above will be described with reference to FIGS. FIG. 2 is a view for explaining the operation of increasing the secondary pressure at the time of water discharge in the automatic valve device according to Embodiment 1 of the present invention, and FIG. 3 is a view at the time of water discharge in the automatic valve device according to Embodiment 1 of the present invention. FIG. 4 is a diagram for explaining the operation for lowering the secondary pressure, and FIG. 4 is a diagram for explaining the water discharge stopping operation in the automatic valve device according to Embodiment 1 of the present invention.

  First, at normal times, as shown in FIG. 1, the water control valve 25 is opened by operating the operation handle 26, the stop valve 17 is opened, the automatic drain valve 21 is opened by atmospheric pressure, and the ball valve 22 is opened. Is closed. The pressure regulating valve 400 is in a closed state. The communication control mechanism 60 is in a valve open state.

  Next, when the pilot valve 18 or the manual start valve 19 is opened, the primary pressurized water supplied from the main pipe (not shown) into the primary flow path 2 passes through the first pipe 30 and the third pipe 32. Into the primary pressure introduction chamber 49. The movable valve body 61 is pressed by the primary-side pressurized water flowing into the primary pressure introduction chamber 49 and moves toward the communication passage 51, and the first flange portion 61 b comes into contact with the valve seat 59. As a result, the communication control mechanism 60 is closed, and the primary-side pressurized water is filled in the primary pressure introduction chamber 49.

  Simultaneously with the opening of the pilot valve 18 or the manual activation valve 19, the primary pressurized water flows into the working chamber 6 b through the first pipe 30 and is filled with water. Thereby, the pressure in the working chamber 6b increases, and the piston 9 moves to the left side in FIG. The moving force of the piston 9 is transmitted to the main valve 7 via the stem 11, and the main valve 7 moves to the left in FIG. 1 against the biasing force of the spring 8. Then, the main valve 7 is separated from the valve seat 4 a, and the primary side pressurized water flows into the secondary side flow path 3 from the primary side flow path 2. Then, as shown in FIG. 2, the primary side pressurized water is filled in the secondary side flow path 3, becomes secondary side pressurized water, circulates through the secondary side pipe 15, and is discharged from the water discharge head 16.

  The secondary pressurized water in the secondary flow path 3 closes the automatic drain valve 21 and is supplied to the secondary pressure introducing chamber 47 of the pressure regulating valve 400 through the second pipe 31. Then, when the pressure of the secondary side pressurized water in the secondary side flow path 3 rises and the pressure in the secondary pressure introduction chamber 47 becomes higher than the spring load (first pressure), the pressure regulating valve 400 is opened. . Thereby, the primary side pressurized water supplied into the working chamber 6b of the automatic valve 100 through the first pipe 30 is pressure-adjusted through the third pipe 32 and the primary pressure introducing chamber 49 as shown in FIG. The water is discharged from the drain port 52 of the valve 400. Therefore, the pressure in the working chamber 6b decreases, the piston 9 moves to the right in FIG. 3, and the opening degree of the main valve 7 decreases.

  Next, the opening degree of the main valve 7 is reduced, and the flow rate of the primary pressurized water flowing from the primary side flow path 2 into the secondary side flow path 3 is reduced. Then, when the pressure of the secondary side pressurized water in the secondary side flow path 3 decreases and the pressure in the secondary pressure introduction chamber 47 becomes lower than the spring load (first pressure), the pressure regulating valve 400 is shown in FIG. To be closed. Thereby, the primary side pressurized water is supplied into the working chamber 6b of the automatic valve 100 through the first pipe 30, the pressure in the working chamber 6b rises, and the piston 9 moves to the left side in FIG. The opening degree of the valve 7 increases. In this way, the valve opening / closing operation of the pressure regulating valve 400 is repeated, and the pressure of the secondary side pressurized water is adjusted to the spring load (first pressure). Then, the secondary pressurized water adjusted to the spring load (first pressure) is discharged from the discharge head 16.

  When the water discharge from the water discharge head 16 is finished and the pilot valve 18 and the manual activation valve 19 are closed, the supply of the primary pressurized water to the working chamber 6b of the automatic valve 100 via the first pipe 30 is stopped. Further, the supply of the primary pressurized water to the primary pressure introduction chamber 49 via the third pipe 32 is eliminated. Then, the primary side pressurized water in the primary pressure introduction chamber 49 flows out into the secondary pressure introduction chamber 47 through a minute gap inevitably generated in the contact portion between the first flange portion 61b and the valve seat 59, and the primary pressure introduction chamber 47 The primary pressure in 49 decreases. When the primary pressure in the primary pressure introduction chamber 49 becomes lower than the sum of the secondary pressure in the secondary pressure introduction chamber 47 and the urging force of the spring 63, the movable valve body 61 moves to the primary pressure introduction chamber 49 side. Then, the communication control mechanism 60 is in the closed release state. Therefore, the primary pressurized water in the working chamber 6 b and the first pipe 30 flows out into the secondary pressure introducing chamber 47 through the gap between the third pipe 32, the primary pressure introducing chamber 49 and the protrusion 62. As a result, the pressure of the primary pressurized water in the working chamber 6 b decreases, and the main valve 7 is closed by the urging force of the spring 8.

  When the main valve 7 is closed, the automatic drain valve 21 is opened, and the residual water in the secondary side pipe 15, the secondary side flow path 3 and the secondary pressure introduction chamber 47 is automatically passed through the second pipe 31. Drained from the drain valve 21. Then, the differential pressure between the primary pressure introduction chamber 49 and the secondary pressure introduction chamber 47 becomes large, and the outflow of the primary-side pressurized water from the primary pressure introduction chamber 49 to the secondary pressure introduction chamber 47 through the gap by the protrusion 62 is accelerated. Is done. The primary pressurized water that has flowed out into the secondary pressure introduction chamber 47 is drained from the automatic drain valve 21 through the second pipe 31. Thereby, discharge | release of the primary side pressurized water in the working chamber 6b and the 1st piping 30 is accelerated | stimulated.

  Next, when checking the opening / closing operation of the automatic valve 100 or checking the setting of the pressure adjustment valve 400, the water control valve 25 is opened by operating the operation handle 26. At this time, the automatic drain valve 21 is opened by the atmospheric pressure, and the ball valve 22 is closed. Then, the start valve 200 is operated, the main valve 7 is opened and closed, and the opening / closing operation of the automatic valve 100 is confirmed and the setting of the pressure regulating valve 400 is confirmed.

  In the automatic valve device configured as described above, the communication control mechanism 60 is disposed in the communication passage 51 that communicates the primary pressure introduction chamber 49 and the secondary pressure introduction chamber 47 with the pressure regulating valve 400, and the main valve after water discharge is stopped. A valve closing mechanism of the valve 7 is configured. The communication control mechanism 60 is held in a closed state while the automatic valve device is in operation, and after the water discharge is stopped, the communication control mechanism 60 is forcibly released from the closed state by the urging force of the spring 63. An automatic valve device that can suppress generation and retention of foreign matter and achieve stable operation over a long period of time can be obtained. That is, maintenance-free of the automatic valve device can be realized.

  Since the movable valve body 61 is made of polytetrafluoroethylene, the production of the product is further suppressed.

  The movable valve body of the pressure regulating valve 400 is kept closed during the operation of the automatic valve device. Therefore, since the primary pressure does not affect the secondary pressure monitoring, the secondary pressure can be managed to the set pressure with high accuracy regardless of the pressure fluctuation of the primary pressure, and the pressure adjustment accuracy is improved.

Moreover, since the clearance gap by the protrusion 62 in the closed release state of the communication control mechanism 60 is constant, the valve closing time of the main valve 7 after the end of water discharge is constant.
Moreover, since the production | generation of a product and the stay of a foreign material are suppressed, the clearance gap by the protrusion 62 does not become large and generation | occurrence | production of an excessive water hammer can be prevented.
In addition, since the pressure adjusting bolt 45 is attached to the spring case 42 and the length of the spring 43, that is, the spring load can be adjusted, the specified pressure of water discharge can be set for each site.

  In the first embodiment, the protrusion 62 is formed on the surface of the second flange portion 61c that faces the first flange portion 61b. However, the protrusion 62 faces the second flange portion 61c of the communication hole 58. You may form in an outer peripheral part and may be formed in both surfaces of the 2nd flange part 61c and the outer peripheral part opposite to the 2nd flange part 61c of the communicating hole 58. FIG.

Embodiment 2. FIG.
FIG. 12 is a cross-sectional view of a movable valve body applied to a communication control mechanism for a pressure regulating valve according to Embodiment 2 of the present invention.

In FIG. 12, a plurality of grooves 64 are formed at equiangular pitches on the surface of the second flange portion 61c facing the first flange portion 61b with the groove direction as the radial direction.
The second embodiment is the same as the first embodiment except that the groove 64 uses the movable valve body 61A formed on the surface of the second flange portion 61c facing the first flange portion 61b. It is constituted similarly.

In the second embodiment, when the first flange portion 61 b is separated from the valve seat 59, the second flange portion 61 c is in contact with the outer peripheral portion on the opposite side of the communication hole 58 from the primary pressure introduction chamber 49 and communicates with the communication hole 58. The passage 51 communicates with the groove 64. That is, a gap due to the groove 64 is formed between the second flange portion 51 c and the outer peripheral portion of the communication hole 58.
Therefore, also in the second embodiment, the same effect as in the first embodiment can be obtained.

  In the second embodiment, the groove 64 is formed on the surface of the second flange portion 61c that faces the first flange portion 61b. However, the groove 64 faces the second flange portion 61c of the communication hole 58. It may be formed on the outer peripheral portion, or may be formed on both surfaces of the second flange portion and the outer peripheral portion facing the second flange portion 61c of the communication hole 58.

Embodiment 3 FIG.
FIG. 13 is a cross-sectional view of a movable valve body applied to a pressure control valve communication control mechanism according to Embodiment 3 of the present invention.

In FIG. 13, a plurality of through holes 65 are formed at equiangular pitches so as to contact the shaft portion 61a with the second flange portion 61c with the hole direction as the length direction of the shaft portion 61a.
Note that the third embodiment is configured in the same manner as in the first embodiment except that the through-hole 65 uses the movable valve body 61B formed in the second flange portion 61c.

In the third embodiment, when the first flange portion 61 b is separated from the valve seat 59, the second flange portion 61 c is in contact with the outer peripheral portion on the opposite side of the communication hole 58 from the primary pressure introduction chamber 49 and communicates with the communication hole 58. The passage 51 communicates with the through hole 65. That is, a gap due to the through hole 65 is formed between the second flange portion 61 c and the outer peripheral portion of the communication hole 58.
Therefore, also in Embodiment 3, the same effect as in Embodiment 1 can be obtained.

In each of the above embodiments, an automatic valve device that does not perform low-pressure water discharge is described as an example. However, the present invention can also be applied to an automatic valve device that performs low-pressure water discharge before specified pressure water discharge. .
In each of the above embodiments, the movable valve body is made of a material having excellent corrosion resistance and slidability such as polytetrafluoroethylene, but the movable valve body is made of a resin having excellent workability. A material excellent in corrosion resistance and slidability such as polytetrafluoroethylene may be coated.

  DESCRIPTION OF SYMBOLS 1 Body part, 2 Primary side flow path, 3 Secondary side flow path, 5 Communication hole, 6 Cylinder, 6b Working chamber, 7 Main valve, 9 Piston, 18 Pilot valve (starting valve), 19 Manual starting valve (Starting valve) ), 30 1st piping, 31 2nd piping, 32 3rd piping, 40 Diaphragm (valve drive mechanism), 42 Spring case (valve drive mechanism), 43 Spring (valve drive mechanism), 47 Secondary pressure introduction chamber, 49 Primary pressure introduction chamber, 51 communication passage, 53 shaft rod (valve drive mechanism), 54 valve body (valve part), 56 valve seat (valve part), 58 communication hole, 60 communication control mechanism, 61 movable valve body, 61a shaft Part, 61b 1st flange part, 61c 2nd flange part, 62 protrusion, 63 spring, 64 groove, 100 automatic valve, 200 starting valve, 400 pressure regulating valve.

Claims (5)

A primary pressure introduction chamber, a secondary pressure introduction chamber, a valve portion that opens and closes the primary pressure introduction chamber to the atmosphere, a communication passage that communicates the primary pressure introduction chamber and the secondary pressure introduction chamber, and the communication passage And a communication control mechanism for controlling opening and closing of the communication path, and when the secondary pressure in the secondary pressure introduction chamber reaches the first pressure, the valve portion is opened, and the second pressure in the secondary pressure introduction chamber is A valve drive mechanism for closing the valve section when the next pressure is less than the first pressure,
The communication control mechanism closes the communication passage when the primary pressure in the primary pressure introduction chamber exceeds the second pressure, and releases the closure of the communication passage when the primary pressure in the primary pressure introduction chamber becomes lower than the second pressure. A pressure regulating valve that is configured to. The communication path has a communication hole that opens to the primary pressure introduction chamber,
The communication control mechanism is
A shaft portion disposed in the communication hole so as to be movable in the hole direction of the communication hole, a first flange portion provided at an end portion protruding from the communication hole of the shaft portion into the primary pressure introduction chamber, and A movable valve body having a second flange portion provided at an end portion protruding from the communication hole of the shaft portion on the opposite side to the primary pressure introduction chamber;
A biasing force that is attached to the shaft and generates a biasing force in a direction that separates the first flange portion from an outer peripheral portion of the communication hole on the primary pressure introduction chamber side against a primary pressure in the primary pressure introduction chamber; A spring that regulates the second pressure in cooperation with the secondary pressure in the secondary pressure introduction chamber,
When the primary pressure in the primary pressure introduction chamber exceeds the second pressure, the first flange portion comes into contact with the outer peripheral portion of the communication hole on the primary pressure introduction chamber side to close the communication passage,
When the primary pressure in the primary pressure introduction chamber becomes lower than the second pressure, the first flange portion is separated from the outer peripheral portion of the communication hole on the primary pressure introduction chamber side, and the second flange portion and the communication hole The pressure regulating valve according to claim 1, wherein a gap is formed between the primary pressure introducing chamber and the outer peripheral portion on the opposite side to release the closing of the communication path.   A protrusion is formed on one surface of the second flange portion and the outer peripheral portion opposite to the primary pressure introduction chamber of the communication hole, and the protrusion is in contact with the other surface, and the relative The pressure regulating valve according to claim 2, wherein the gap is formed between surfaces to be operated.   A groove is formed on one surface of the second flange portion and the outer peripheral portion on the side opposite to the primary pressure introduction chamber of the communication hole, and the opposed surface is in contact with the gap, and the gap is formed by the groove. The pressure regulating valve according to claim 2, wherein: A trunk portion having a primary side flow path and a secondary side flow path partitioned by an isolation wall having a communication hole, a main valve for opening and closing the communication hole from the primary side flow path side, and via the secondary side flow path A cylindrical cylinder projecting from the body portion so as to face the communication hole, and is slidably disposed in the cylinder, and is defined on the opposite side of the secondary flow path in the cylinder. An automatic valve having a piston for opening and closing the main valve according to the pressure in the working chamber,
The pressure regulating valve according to any one of claims 1 to 4,
A first pipe communicating the primary channel and the working chamber;
An activation valve disposed in the path of the first pipe and controlling the supply of primary pressurized water to the working chamber;
A second pipe communicating the secondary side flow path and the secondary pressure introduction chamber;
An automatic valve device comprising: a third pipe communicating the working chamber and the primary pressure introduction chamber.

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