JP2012210379A - Automatic valve device and pressure regulating valve used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic valve device and a pressure regulating valve, allowing avoidance of generation of a situation that a main valve is not closed by suppressing a jam of foreign matter into a gap of an orifice part or generation of a product.SOLUTION: The gap between a valve seat 62 for an orifice and a valve element 63 for the orifice is held in a minute first gap in a state that a starting valve is opened and that primary side pressurized water is supplied into a primary pressure lead-in chamber through a third pipe, and is held in a second gap larger than the first gap in a state that the starting valve is closed, that the pressure of the primary side pressurized water inside an operation chamber is reduced, and that the main valve is closed.

Description

  The present invention relates to an automatic valve device that is installed in a tunnel such as a high-speed motorway and supplies a pressurized water to a water discharge head and discharges the water, and a pressure regulating valve used therefor.

  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 area of the fire prevention zone is specified. 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 of the water. 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, and a pressure adjustment that supplies pressurized water for driving adjusted to a predetermined pressure to the actuator. And an automatic drain valve for draining the pressurized water of the actuator via the pressure regulating valve in a state where the supply of the pressurized water to the actuator is stopped (see, for example, 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 to solve the above-described problems, and is configured such that the gap of the orifice portion is widened after the end of water discharge, suppressing clogging of foreign matter in the gap and generation of products, and the main valve It is an object of the present invention to obtain an automatic valve device that can avoid the occurrence of a situation where it cannot be closed and a pressure regulating valve used therefor.

  An automatic valve device according to the present invention includes a body 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 that opens and closes the communication hole from the primary flow path side, A cylindrical cylinder projecting from the body portion so as to face the communication hole via a secondary-side flow path, and slidably disposed in the cylinder, and the secondary side in the cylinder An automatic valve having a piston that opens and closes the main valve according to the pressure in the working chamber defined on the opposite side of the flow path, the primary pressure introducing chamber, the secondary pressure introducing chamber, and the primary pressure introducing chamber to the atmosphere. A valve portion that opens and closes, a communication passage that communicates the primary pressure introduction chamber and the secondary pressure introduction chamber, a valve drive mechanism that opens and closes the valve portion according to the pressure in the secondary pressure introduction chamber, and a communication passage A pressure regulating valve having a formed orifice, the primary flow path and the operation; A first pipe that communicates with the first pipe, a start valve that is disposed in the path of the first pipe and that controls the supply of primary-side pressurized water to the working chamber, the secondary-side flow path, and the secondary pressure introduction A second pipe that communicates with the chamber; and a third pipe that communicates between the working chamber and the primary pressure introduction chamber. In the open state of the start valve, the pressure regulating valve is configured to change the valve according to the pressure of the secondary side pressurized water in the secondary pressure introducing chamber supplied from the secondary side passage through the second pipe. The opening of the main valve is controlled so that the pressure of the secondary pressurized water in the secondary pressure introduction chamber becomes a predetermined pressure, and when the start valve is closed, The primary side pressurized water is caused to flow out from the orifice portion to the secondary pressure introduction chamber through the third pipe and the primary pressure introduction chamber to lower the pressure of the primary side pressurized water in the working chamber and close the main valve. It is configured. The orifice portion is held in the minute first gap when the start valve is opened and the primary pressurized water is supplied to the primary pressure introduction chamber via the third pipe, and the start valve Is closed, the pressure in the primary pressurized water in the working chamber is lowered, and the main valve is closed, so that it is held in a second gap larger than the first gap.

  According to the present invention, the orifice portion is held in the minute first gap when the start valve is opened and the primary side pressurized water is supplied to the primary pressure introduction chamber via the third pipe. Is closed, the pressure in the primary side pressurized water in the working chamber is lowered, and the main valve is closed, so that it is held in a second gap larger than the first gap. Therefore, even if foreign matter in the primary-side pressurized water enters the gap in the orifice portion, the gap in the orifice portion is expanded to the second gap after the end of water discharge, and the foreign matter falls from the gap in the orifice portion. Moreover, since the clearance gap of an orifice part is expanded to a 2nd clearance gap after completion | finish of water discharge, a product is hard to be produced | generated by the clearance gap of an orifice part. As a result, the occurrence of a situation in which the gap between the orifice portions is blocked, the valve closing time of the main valve is lengthened, or the main valve cannot be closed is avoided.

It is a schematic block diagram which shows the automatic valve apparatus which concerns on 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 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 this invention. It is a figure explaining the water discharge stop operation | movement in the automatic valve apparatus which concerns on this invention. It is sectional drawing which shows the pressure control valve used for the automatic valve apparatus which concerns on this invention. It is sectional drawing which shows the pressure control valve used for the automatic valve apparatus which concerns on this invention. It is principal part sectional drawing which shows the non-operation state of the pressure regulation valve used for the automatic valve apparatus which concerns on this invention. It is principal part sectional drawing which shows the operating state of the pressure regulation valve used for the automatic valve apparatus which concerns on this invention.

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

FIG. 1 is a schematic configuration diagram showing an automatic valve device according to 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 main valve drive mechanism of the main valve 7 is supplied with the primary side pressurized water to start the automatic valve device 200, and when the secondary side pressurized water pressure reaches a predetermined pressure, the main valve 7 is opened. The pressure regulating valve 400 that controls the degree of opening to the set opening and the secondary side of the automatic valve 100 are opened when water is discharged from the water discharge head, and when the automatic valve 100 is tested without water discharge from the water discharge head. The water control valve 25 is closed, the drain unit 300 for draining the secondary side pressurized water in the secondary side channel 3, and the water discharge signal when the pressure of the secondary side pressurized water of the automatic valve 100 exceeds a predetermined water discharge pressure. And a pressure switch 20 for transmitting to a monitoring room or the like.

  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 at the tip of 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 side flow path 2 so as to press the main valve 7 toward the secondary side flow path 3. 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. Further, the stem 11 is fixed so that one end is fixed to the center position of the piston 9 and the other end is fitted to the center position of the main valve 7 so that the axis thereof coincides with the axis 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 of the pressure regulating valve 400 will be described with reference to FIGS. 5 and 6 are cross-sectional views showing a pressure regulating valve used in the automatic valve device according to the present invention, respectively, and FIG. 7 is a cross-sectional view of a main part showing a non-actuated state of the pressure regulating valve used in the automatic valve device according to the present invention. FIG. 8 is a cross-sectional view of the main part showing the operating state of the pressure regulating valve used in the automatic valve device according to the present invention.

  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 the secondary pressure into the secondary pressure introduction chamber 47, a primary pressure introduction chamber 49, and a primary pressure A primary pressure introduction port 50 that introduces a primary pressure into the 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 drain that communicates the primary pressure introduction chamber 49 and the atmosphere. Port 52 is formed.
The shaft 53 is fixed to the diaphragm holder 41 at one end, is disposed so as to pass through the secondary pressure introduction chamber 47, pass through the valve body 46, and extend 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 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.

  An orifice plate 60 is disposed so as to block the communication path 51, and a communication hole 61 is formed so as to penetrate the orifice plate 60. The primary pressure introduction chamber 49 side of the communication hole 61 is increased in diameter to a conical shape, thereby constituting an orifice valve seat 62. The orifice valve body 63 is formed in a spherical shape using a material having excellent corrosion resistance, such as polytetrafluoroethylene, and the inner pressure of the truncated cone shape is obtained by using the primary pressure introduced into the primary pressure introduction chamber 49 as an operating force. The orifice plate 60 in the communication hole 61 is disposed on the primary pressure introduction chamber 49 side so as to be able to contact and separate from the orifice valve seat 62 constituted by the peripheral surface.

  A gap adjusting jig 64 as a gap securing means is formed integrally with the block main body 65, the adjusting rod 66, and the rear end of the adjusting rod 66, and is screwed into the female screw portion formed in the block main body 65. And an adjustment screw 67 for rotating the adjustment rod forward and backward, and is attached to the valve body 46 so that the tip of the adjustment rod 66 is inserted into the communication hole 61 from the secondary pressure introduction chamber 47 side. The gap adjusting jig 64 is configured to be able to adjust the amount of insertion of the adjusting rod 66 into the communication hole 61 by rotating the adjusting screw 67.

  In the pressure regulating valve 400 configured as described above, the amount of extension of the pressure adjusting bolt 45 into the spring case 42 is adjusted, and the spring load is adjusted to be 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).

  When the primary pressure is introduced from the primary pressure introduction port 50 into the primary pressure introduction chamber 49, the primary pressure introduced into the primary pressure introduction chamber 49 acts on the orifice valve body 63, and the orifice valve body 63 becomes the orifice valve. Move to the seat 62 side. At this time, as shown in FIG. 8, the orifice valve element 63 comes into contact with the tip of the adjustment rod 66 inserted into the communication hole 61. The orifice valve body 63 is inclined with respect to the axial center of the adjustment rod 66 due to the fluctuation of the primary pressure introduced into the primary pressure introduction chamber 49 and the dead weight of the orifice valve body 63, and a part of the orifice valve body 63. Only the orifice valve seat 62 is in contact with the orifice valve seat 62, and a gap is formed between the orifice valve body 63 and the orifice valve seat 62.

  Then, the adjusting screw 67 of the gap adjusting jig 64 is rotated to change the amount of insertion of the adjusting rod 66 into the communication hole 61, and the gap between the orifice valve element 63 and the orifice valve seat 62 is very small. It is adjusted to the gap. When the pressure of the primary pressure introduced into the primary pressure introduction chamber 49 is weakened, as shown in FIG. 7, the orifice valve body 63 comes off from the orifice valve seat 62 due to its own weight, and the orifice valve body 63 and The gap with the orifice valve seat 62 is expanded to a large second gap. The orifice portion is constituted by the orifice valve seat 62, the orifice valve body 63, the adjusting rod 66, and the like.

  The secondary pressure 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 pressure introduced into the primary pressure introduction chamber 49 from the primary pressure introduction port 50 is discharged from the drainage port 52. Further, 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. . Thereby, discharge of the primary pressure from the drainage port 52 is stopped. The pressure regulating valve 400 is a normally closed pressure regulating valve.

  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 causes the primary side pressurized water in the working chamber 6 b to enter the secondary pressure introducing chamber 47 from a minute first gap between the orifice valve body 63 and the orifice valve seat 62. It functions as a valve closing mechanism of the main valve 7 after the water discharge is stopped to flow out and close the main valve 7.

Here, if the gap between the orifice valve body 63 and the orifice valve seat 62 is too narrow, the amount of primary-side pressurized water flowing out from the gap is reduced, and the primary side into the working chamber 6b of the cylinder 6 is reduced. The time from stopping the supply of pressurized water to closing the main valve 7 of the automatic valve 100 becomes longer. If the gap becomes wider, the amount of primary-side pressurized water flowing out from the gap will increase, and the pressure in the working chamber 6b will not rise, affecting the specified pressure setting function of the pressure regulating valve 400. If the gap becomes wider, the main valve 7 is immediately closed after the water discharge is stopped, and a water hammer that affects the durability of the component parts is generated, thereby reducing the reliability.
Therefore, after installation of the automatic valve device, considering the situation such as water pressure at the installation site, the pressure is adjusted so that the spring load and the clearance between the orifice valve body 63 and the orifice valve seat 62 meet the required specifications. Adjustment is made by the bolt 45 and the adjusting screw 67.

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 diagram for explaining the operation of increasing the secondary pressure at the time of water discharge in the automatic valve device according to the present invention, and FIG. 3 is a diagram for explaining the operation of decreasing the secondary pressure at the time of water discharge in the automatic valve device according to the present invention. FIG. 4 and FIG. 4 are views for explaining a water discharge stop operation in the automatic valve device according to the present invention.

  First, in the monitoring state, 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 the atmospheric pressure, and the ball valve 22 is opened. Is closed.

  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 and filled with water. As a result, the orifice valve body 63 is pressed by the primary pressurized water filled in the primary pressure introduction chamber 49 and moves to the orifice valve seat 62 side, abuts against the tip of the adjustment rod 66, and the orifice valve body 63. A gap (first gap) is secured between the valve seat 62 and the orifice valve seat 62.

  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. And 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 a predetermined 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. 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 a predetermined pressure, the pressure regulating valve 400 is closed as shown in FIG. Is done. 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. Thus, 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 a predetermined pressure. Then, the secondary side pressurized water adjusted to a predetermined 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. Then, the primary pressurized water in the working chamber 6b and the first pipe 30 is, as indicated by arrows in FIG. 4, the third pipe 32, the primary pressure introducing chamber 49, the orifice valve body 63, and the orifice valve seat 62. Flows out into the secondary pressure introduction chamber 47 through the gap (first gap) between the two. 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 introducing chamber 49 and the secondary pressure introducing chamber 47 becomes large, and the secondary pressure is introduced through the gap (first gap) between the orifice valve body 63 and the orifice valve seat 62. The outflow of the primary pressurized water to the chamber 47 is accelerated. The primary pressurized water that has flowed into the secondary pressure introducing chamber 47 is drained from the automatic drain valve 21 through the second pipe 31 as indicated by the arrows in FIG. Thereby, discharge | release of the primary side pressurized water in the working chamber 6b and the 1st piping 30 is accelerated | stimulated. When the pressure in the primary pressure introduction chamber 49 is reduced by the force that the orifice valve body 63 rolls down the inner peripheral surface of the orifice valve seat 62 due to its own weight, the orifice valve body 63 is caused by the weight of the orifice valve seat 62 due to its own weight. Roll down the inner surface. Therefore, the gap between the orifice valve body 63 and the orifice valve seat 62 is widened to form a second gap.

  Next, when checking the opening / closing operation of the automatic valve 100 or checking the setting of the pressure adjusting valve 400, the operation handle 26 is operated to close the water control valve 25. 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, an orifice portion is formed in the communication passage 51 that communicates the primary pressure introduction chamber 49 and the secondary pressure introduction chamber 47 of the pressure regulating valve 400, and the main valve 7 after the water discharge is stopped. A valve closing mechanism is configured. The orifice portion is configured to be held in a minute first gap when the pressure in the primary pressure introduction chamber 49 increases, and to be held in a wide second gap when the pressure in the primary pressure introduction chamber 49 decreases. Has been. Therefore, no product is generated in the gap. Further, even when foreign matter is clogged in the orifice portion during the operation of the automatic valve device, when the automatic valve device is stopped, the gap in the orifice portion is expanded and the foreign matter clogged in the gap is removed. Therefore, the gap between the orifices is narrowed by foreign matter or products, and the occurrence of problems such as the main valve 7 being closed longer or the main valve 7 being unable to close is avoided in advance, and stable operation over a long period of time. An automatic valve device that can realize the above is obtained.

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.
Moreover, since the clearance of the orifice portion is configured to be adjustable, it is possible to set the valve closing time of the main valve 7 after stopping water discharge in consideration of the situation such as water pressure at the site.

  The orifice portion tries to contact the orifice valve seat 62, the spherical orifice valve body 63 that contacts and separates from the orifice valve seat 62 by operating the pressure in the primary pressure introduction chamber 49, and the orifice valve seat 62. Therefore, the configuration of the orifice portion can be simplified, and the orifice portion can be easily constructed in the communication passage 51.

  In addition, since the adjustment screw 67 is screwed to the female screw portion formed on the block main body 65 and the adjustment rod 66 is integrally formed at the tip of the adjustment screw 67 to constitute the gap adjustment jig 64, the gap adjustment jig 64 is configured. The clearance between the valve body 63 and the orifice valve seat 62 can be easily adjusted with high accuracy.

In the above embodiment, 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 the above-described embodiment, the pressure adjustment valve is described as having an orifice part. However, a separate form in which the pressure adjustment valve and the orifice part are connected by piping is also applicable to the pressure adjustment valve of the present invention. Included in the valve.

  DESCRIPTION OF SYMBOLS 1 Body part, 2 Primary side flow path, 3 Secondary side flow path, 4a Valve seat, 6 Cylinder, 6b Actuation chamber, 7 Main valve, 8 Spring (biasing means), 9 Piston, 18 Pilot valve (starting valve) , 19 Manual start valve (start valve), 30 1st pipe, 31 2nd pipe, 32 3rd pipe, 40 Diaphragm (valve drive mechanism), 42 Spring case (valve drive mechanism), 43 Spring (valve drive mechanism), 46 valve body, 47 secondary pressure introduction chamber, 48 secondary pressure introduction port, 49 primary pressure introduction chamber, 50 primary pressure introduction port, 51 communication path, 62 valve seat for orifice (orifice portion), 63 valve body for orifice ( Orifice part), 64 Gap adjustment jig (Gap securing means, Orifice part), 65 Block body, 66 Adjustment rod, 67 Adjustment screw, 100 Automatic valve, 200 Start valve, 400 Pressure tuning valve.

Claims (6)

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,
A primary pressure introduction chamber, a secondary pressure introduction chamber, a valve portion for opening and closing the primary pressure introduction chamber to the atmosphere, a communication path communicating the primary pressure introduction chamber and the secondary pressure introduction chamber, and the secondary pressure introduction chamber A valve drive mechanism that opens and closes the valve portion according to pressure, and a pressure regulating valve having an orifice portion formed in the communication path;
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;
A third pipe communicating the working chamber and the primary pressure introduction chamber,
The pressure regulating valve is
In the open state of the start valve, the valve portion is opened and closed according to the pressure of the secondary side pressurized water in the secondary pressure introduction chamber supplied from the secondary side flow path through the second pipe, Controlling the opening of the main valve so that the pressure of the secondary side pressurized water in the secondary pressure introducing chamber becomes a predetermined pressure,
When the start valve is closed, the primary pressurized water in the working chamber is caused to flow out from the orifice portion to the secondary pressure introducing chamber through the third pipe and the primary pressure introducing chamber, and the primary pressure in the working chamber is reached. Configured to lower the pressure of the side pressurized water and close the main valve,
The orifice part is
In the state where the start valve is opened and the primary side pressurized water is supplied into the primary pressure introduction chamber via the third pipe, it is held in a minute first gap,
When the start valve is closed, the pressure of the primary pressurized water in the working chamber is reduced, and the main valve is closed, the start valve is configured to be held in a second gap larger than the first gap. Automatic valve device characterized by.   The orifice section includes an orifice valve seat having a frusto-conical inner peripheral surface on the primary pressure introduction chamber side, and the pressure for the orifice using the pressure of the primary pressurized water in the primary pressure introduction chamber as an operating force. A spherical orifice valve element disposed in contact with and away from the valve seat, and the orifice valve element and the orifice valve seat when the orifice valve element contacts the orifice valve seat. The automatic valve device according to claim 1, further comprising a gap securing means for securing the first gap.   3. The automatic valve device according to claim 2, wherein the clearance securing means is configured to be able to adjust the size of the first clearance. 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 when the secondary pressure in the secondary pressure introduction chamber reaches the first pressure, the valve portion is opened, and the secondary pressure in the secondary pressure introduction chamber is less than the first pressure. And a valve drive mechanism for closing the valve part,
The orifice portion is held in the minute first gap when the primary pressure in the primary pressure introduction chamber reaches the second pressure, and wider than the first gap when the primary pressure in the primary pressure introduction chamber becomes lower than the second pressure. A pressure regulating valve configured to be held in the second gap.   The orifice section includes an orifice valve seat having a frusto-conical inner peripheral surface on the primary pressure introduction chamber side, and a spherical orifice arranged so as to be able to contact and separate from the orifice valve seat. And a clearance securing means for securing the first clearance between the orifice valve body and the orifice valve seat when the orifice valve body contacts the orifice valve seat. The pressure regulating valve according to claim 4, wherein the pressure regulating valve is provided.   6. The pressure regulating valve according to claim 5, wherein the clearance securing means is configured to be able to adjust the size of the first clearance.

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