JP2012139467A - Automatic valve device and pressure adjustment valve used in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic valve device and a pressure adjustment valve that are configured such that foreign matter blocking a gap and products produced in the gap are caused to flow out together with primary pressure water that flows out through a valve during the pressure control of secondary pressurized water in a secondary conduit, thereby avoiding the occurrence in which a main valve cannot be closed.SOLUTION: The pressure adjustment valve 500 comprises: a valve body 57 having a secondary pressure introducing chamber 58, a secondary pressure introducing port 59 configured to introduce a secondary pressure into the secondary pressure introducing chamber 58, a primary pressure introducing chamber 60, a primary pressure introducing port 61 configured to introduce a primary pressure into the primary pressure introducing chamber 60, and a valve body 64 and valve seat 66 configured to open or close the primary pressure introducing chamber with respect to the atmosphere; a valve drive mechanism configured to open the valve body 64 by separating the valve body 64 from the valve seat 66 when a secondary pressure in the secondary pressure introducing chamber 58 reaches a predetermined pressure and to close the valve body 64 by bringing the valve body 64 into contact with the valve seat 66 when the secondary pressure in the secondary pressure introducing chamber 58 is lower than the predetermined pressure. A groove 67 is formed in the valve seat 66. A predetermined gap is provided to allow communication between the primary pressure introducing chamber 60 and the atmosphere when the 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 this pressure regulating valve is adjusted to a small gap so that it 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. ing. 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 problem, and a gap for allowing the primary pressurized water in the working chamber to flow out to the atmosphere in order to close the main valve of the automatic valve is provided in the secondary flow path. In order to control the pressure of the secondary-side pressurized water to a predetermined pressure, it is formed in the valve section that allows the primary-side pressurized water in the working chamber to flow out. It is an object of the present invention to provide an automatic valve device that can flow out together with primary-side pressurized water that flows out from the valve portion during pressure control of the secondary-side pressurized water, and can avoid the occurrence of a situation where the main valve cannot be closed, and a pressure regulating valve used therefor.

  An automatic valve device according to the present invention has a body portion having a primary flow path and a secondary flow path partitioned by a valve seat, and is disposed in the primary flow path so as to be able to contact and separate from the valve seat. A main valve, an urging means for urging the main valve in a direction in contact with the valve seat, the main valve facing the main valve via the secondary-side flow path, and an axial direction as a contact / separation direction of the main valve A cylindrical cylinder projecting from the trunk main body, and a primary chamber to a working chamber that is slidably disposed in the cylinder and is defined on the opposite side of the secondary flow path in the cylinder. The automatic valve having a piston that moves by the supply of side pressurized water to open the main valve, the secondary pressure introduction chamber, the primary pressure introduction chamber, and the primary pressure introduction chamber are opened and closed with respect to the atmosphere and closed. Sometimes, the pressure in the valve section in which a predetermined gap is formed and the pressure in the secondary pressure introduction chamber reach a predetermined pressure. And a pressure regulating valve having a valve drive mechanism for opening the valve portion, a first pipe communicating the primary flow path and the working chamber, and a path of the first pipe. A start valve for controlling the supply of side pressurized water to the working chamber, a second pipe communicating the secondary side flow path and the secondary pressure introducing chamber, and communicating the working chamber and the primary pressure introducing chamber. And a third pipe. The pressure regulating valve is supplied from the secondary flow path through the second pipe in a state where the primary pressurized water is supplied to the working chamber through the first pipe by the start valve. When the pressure of the secondary side pressurized water in the secondary pressure introducing chamber reaches the predetermined pressure, the valve part is opened, and the primary side pressurized water in the working chamber is caused to flow out to the atmosphere so that the primary side pressurized water in the working chamber is discharged. When the pressure is reduced and the pressure of the secondary side pressurized water in the secondary pressure introduction chamber does not reach the predetermined pressure, the valve portion is closed to increase the pressure of the primary side pressurized water in the working chamber, and the secondary pressure introduction chamber The state in which the opening of the main valve is controlled so that the pressure of the secondary side pressurized water becomes the predetermined pressure, and the primary side pressurized water is not supplied to the working chamber via the first pipe by the start valve Then, the primary side pressurized water in the working chamber is 3 by flowing out into the atmosphere from the gap through the pipe and the primary pressure introducing chamber lowers the pressure in the primary side pressurized water of the working chamber, and is configured to close the main valve.

  According to this invention, the gap for causing the primary side pressurized water to flow out in the working chamber and closing the main valve is the pressure of the secondary side pressurized water in the secondary pressure introduction chamber, that is, the secondary side in the secondary side flow path. It is formed in the valve part which flows the primary side pressurized water in the working chamber out to the atmosphere so that the pressure of the side pressurized water becomes a predetermined pressure. Therefore, even if foreign matter in the primary pressurized water enters the gap or a product is created in the gap, the valve part is opened and closed while the automatic valve device is operating, so the foreign substance and product flow out of the valve part. Are repeatedly exposed to the flow of primary pressurized water and discharged together with the primary pressurized water. As a result, the gap formed in the valve portion is closed, and the occurrence of a situation in which the main valve is closed for a long time 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 low pressure water discharge state in the automatic valve apparatus which concerns on this invention. It is a figure explaining the regulation pressure water discharge state in the automatic valve apparatus which concerns on this invention. It is a figure explaining the state at the time of restoration in the automatic valve device concerning 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 a top view which shows the plug which comprises the pressure regulating valve used for the automatic valve apparatus which concerns on this invention. It is VII-VII arrow sectional drawing of FIG.

  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 the primary side pressurized water flowing from the primary side channel 2 to the secondary side channel 3, and the primary side pressurized water. , And an initial water discharge pressure control valve 200 for switching the opening of the main valve 7 from the initial opening to the set opening after a predetermined delay time, and the main valve drive mechanism and the initial water discharge of the main valve 7 of the automatic valve 100. A start valve 300 that starts the automatic valve device by supplying primary side pressurized water to the pressure control valve 200, and sets the opening degree of the main valve 7 by detecting that the pressure of the secondary side pressurized water has reached a predetermined pressure. A pressure control valve 500 that is controlled to the secondary side, and a water control valve that is disposed on the secondary side of the automatic valve 100, opens when the water discharge head discharges, does not discharge from the water discharge head, and closes when the automatic valve 100 is tested. 25 and the secondary side pressurized water in the secondary side flow path 3 is drained. Water unit 400, and a pressure switch 20 the pressure of the secondary side pressurized water of the automatic valve 100 is sending to such monitoring chambers and water discharge signal becomes more low relief pressure, the.

  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.

  A cylindrical case 12 is attached coaxially with the axial center of the cylinder 6 so as to open to the working chamber 6 b of the cylinder 6. A bottomed cylindrical lift setting adjuster 13 is attached to the inner wall surface of the other end side of the case 12 so as to freely advance and retract. Further, one end of the shaft 14 is fixed to the piston 9 and the other end side is inserted into the adjuster 13 so as to be aligned with the axis of the cylinder 6. The shaft 14 moves in the axial direction of the cylinder 6 in conjunction with the movement of the piston 9. At this time, the large diameter portion 14 a formed on the other end side of the shaft 14 slides on the inner wall surface of the adjuster 13.

  By changing the advance / retreat amount of the adjuster 13 with respect to the case 12, the piston 9 from the initial state until the large-diameter portion 14a comes out of the adjuster 13 (the sliding relationship between the large-diameter portion 14a and the inner wall surface of the adjuster 13 is lost). The stroke amount can be changed. That is, the initial opening degree of the main valve 7 is adjusted by adjusting the advance / retreat amount of the adjuster 13 with respect to the case 12.

Next, the structure of the initial water discharge pressure control valve 200 will be described.
A pair of first and second cylinders 30 and 31 each formed in a bottomed cylindrical shape are fastened and clamped with a separator 32 sandwiched between the openings. The first piston 33 formed in a bottomed cylindrical shape is slidably disposed in the first cylinder 30 with the opening facing the separator 32. Further, a second piston 34 formed in a bottomed cylindrical shape is disposed in the first piston 33 with the opening facing the separator 32. An actuation spring 35 is disposed between the inner bottom surface of the first piston 33 and a flange portion 34a that protrudes radially outward from the opening edge of the second piston 34. Further, a return spring 36 is disposed between the inner bottom surface of the second piston 34 and the separator 32.

Here, the pressurizing chamber 37 is constituted by the first cylinder 30 and the first piston 33 so that the primary-side pressurized water can be supplied to the pressurizing chamber 37 via the port P3 formed at the top of the first cylinder 30. It has become. Further, a first piston position adjusting bolt 39 is screwed onto the top of the first cylinder 30.
Further, the spring force of the operating spring 35 is set larger than the spring force of the return spring 36. In the initial state where the primary pressurized water is not supplied into the pressurizing chamber 37, the flange portion 34 a of the second piston 34 is in contact with the flange portion 33 a of the first piston 33 by the biasing force of the operating spring 35. Further, in the initial state, the first piston 33 is in contact with the end portion of the first piston position adjusting bolt 39 that extends into the pressurizing chamber 37 by the urging force of the return spring 36.

  The oil chamber 40 is a sealed space formed by the second cylinder 31 and the separator 32, and is filled with silicone oil 41. The shaft 42 penetrates the oil chamber 40 and is disposed so as to be reciprocally movable in the axial direction of the second cylinder 31. One end of the shaft 42 is fixed to the bottom of the second piston 34, and the other end extends to the on-off valve 46 side described later.

A braking partition plate 43 is fixed to the shaft 42 so as to separate the oil chamber 40 into the first and second oil chambers 40 a and 40 b in the axial direction of the second cylinder 31. The braking partition plate 43 slides on the inner peripheral wall surface of the second cylinder 31 in conjunction with the movement of the shaft 42. Further, the orifice 44 is formed in the braking partition plate 43 so as to communicate with the first and second oil chambers 40a and 40b.
The on-off valve 46 includes an input port P1, an output port P2, and a valve body 45 that opens and closes between the input port P1 and the output port P2.

In the initial water discharge pressure control valve 200 configured as described above, the first piston 33 can be changed by changing the advance / retreat amount of the first piston position adjusting bolt 39, that is, by changing the extension amount into the pressurizing chamber 37. The initial position of can be changed. Thereby, since the length of the return spring 36 is changed, the stroke amount of the shaft 42 is changed, and the valve closing time (delay time) from the supply of the primary side pressurized water to the closing of the on-off valve 46 is changed.
Further, when the braking partition plate 43 is lowered, the silicone oil 41 in the second oil chamber 40 b flows into the first oil chamber 40 a via the orifice 44 provided in the braking partition plate 43. Therefore, the descending speed of the braking partition plate 43 is not affected by the viscosity of the fluid and the temperature characteristics of the fluid, and is controlled by the diameter of the orifice 44. Therefore, the lowering speed of the braking partition plate 43 becomes stable regardless of the environmental temperature.

The start valve 300 includes a pilot valve 18 and a manual start valve 19 and is arranged in parallel with the first pipe 70. A stop valve 17 is disposed on the upstream side of the start valve 300 in the first pipe 70.
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 400 includes an automatic drain valve 21 and a manual ball valve 22, and is disposed in the second pipe 72. The pressure switch 20 is disposed in the second pipe 72.

  Next, the structure of the pressure regulating valve 500 will be described with reference to FIGS. 5 is a sectional view showing a pressure regulating valve used in the automatic valve device according to the present invention, FIG. 6 is a top view showing a plug constituting the pressure regulating valve used in the automatic valve device according to the present invention, and FIG. 6 is a cross-sectional view taken along arrow VII-VII in FIG.

  The pressure regulating valve 500 is configured such that the diaphragm 51 is held by a diaphragm holder 52 and is sandwiched between a spring case 53 and a valve body 57. The spring case 53 is formed in a bottomed cylindrical shape. A spring 54 for applying a spring load for setting a prescribed pressure on the secondary side of the automatic valve 100 is contracted between the spring seat 55 and the diaphragm holder 52. Further, the pressure adjusting bolt 56 is screwed so as to penetrate the top of the spring case 53, and the amount of contraction of the spring 54 can be reduced by adjusting the amount of extension of the pressure adjusting bolt 56 into the spring case 53. Adjustable, spring load can be adjusted.

The valve body 57 includes a secondary pressure introduction chamber 58 defined by the diaphragm 51, a secondary pressure introduction port 59 for introducing a secondary pressure into the secondary pressure introduction chamber 58, a primary pressure introduction chamber 60, and a primary pressure A primary pressure introduction port 61 that introduces a primary pressure into the pressure introduction chamber 60 and a drainage port 62 that communicates the primary pressure introduction chamber 60 and the atmosphere are formed.
The shaft 63 is fixed to the diaphragm holder 52 at one end, and is disposed so as to pass through the secondary pressure introduction chamber 58, pass through the valve body 57, and extend into the primary pressure introduction chamber 60. It is configured to be able to reciprocate in conjunction with the displacement. Note that an O-ring 68 is attached to the through-hole of the shaft rod 63 in the valve body 57 to ensure a seal between the secondary pressure introduction chamber 58 and the primary pressure introduction chamber 60.

The plug 65 is manufactured in a bottomed cylindrical shape, and is fitted and held in the drain port 62 with the bottom side facing the primary pressure introduction chamber 60. A valve seat 66 having a predetermined diameter is formed at the bottom of the plug 65, and the valve body 64 formed at the tip of the shaft rod 63 can be brought into contact with and separated from the valve seat 66 by the reciprocating movement of the shaft rod 63. Yes.
Here, the valve body 64 and the valve seat 66 constitute a valve portion. The valve body 64 is made in a conical shape and is arranged coaxially with the valve seat 66. On the other hand, a groove 67 is formed in the valve seat 66 so as to form a predetermined gap when the valve body 64 contacts. Further, the diaphragm 51, the spring case 53, the spring 54, the shaft rod 63, and the like constitute a valve drive mechanism.

  In the pressure adjustment valve 500 configured as described above, the amount of extension of the pressure adjustment bolt 56 into the spring case 53 is adjusted, and the spring load is adjusted to be a set value. The diaphragm 51 is displaced toward the primary pressure introduction chamber 60 by a spring load acting via the diaphragm holder 52, and the valve body 64 is in contact with the valve seat 66 and is in a closed state (initial state).

Next, when the secondary pressure is introduced from the secondary pressure introduction port 59 into the secondary pressure introduction chamber 58 and the pressure in the secondary pressure introduction chamber 58 rises to overcome the spring load, the diaphragm 51 moves toward the spring case 53 side. The valve body 64 is displaced from the valve seat 66 and is opened. Thereby, the primary pressure introduced into the primary pressure introduction chamber 60 from the primary pressure introduction port 61 is discharged from the drainage port 62.
Further, when the pressure in the secondary pressure introduction chamber 58 decreases and is inferior to the spring load, the diaphragm 51 is displaced toward the primary pressure introduction chamber 60, and the valve body 64 comes into contact with the valve seat 66 to be in a closed state. . Thereby, the discharge of the primary pressure from the drain port 62 is stopped.
Furthermore, although the pressure regulating valve 500 is a normally closed type, since the groove portion 67 is formed in the valve seat 66, there is a slight leakage of the primary pressure when the valve is closed.

  As will be described later, the pressure regulating valve 500 is opened when the pressure of the secondary side pressurized water in the secondary side flow path 3 reaches a predetermined pressure, and a specified pressure setting for setting a specified pressure of the specified pressure discharge water. Acts as a mechanism. And the pressure of specified pressure water discharge can be adjusted by adjusting a spring load. Further, as will be described later, the pressure regulating valve 500 closes the main valve 7 after the water discharge is stopped to discharge the primary pressurized water in the working chamber 6b and the branch pipe 71 through the groove portion 67 and close the main valve 7. It functions as a valve mechanism.

Here, when the total cross-sectional area of the gap formed by the groove 67 when the valve body 64 comes into contact with the valve seat 66 is less than 0.4 mm ^{2, the} amount of primary-side pressurized water leaking from the gap decreases, and the cylinder 6 until the main valve 7 of the automatic valve 100 is closed after the supply of the primary pressurized water into the working chamber 6b is stopped. When the total cross-sectional area of the gap exceeds 8 mm ² , the amount of primary-side pressurized water leaking from the gap increases, the pressure in the working chamber 6b does not increase, and the specified pressure setting function of the pressure regulating valve 500 is affected. Will affect. In addition, if the total cross-sectional area of the gap exceeds 4 mm ² , a water hammer exceeding 3 Mpa, which affects the durability of the component parts, occurs when the main valve 7 is closed (at the time of recovery), reducing reliability. I will let you. Therefore, the total cross-sectional area of the gap is preferably set to be 0.4 mm ² or more and 4 mm ² or less.

Next, the piping system will be described.
One end of the first pipe 70 is connected to the primary flow path 2 of the automatic valve 100 via the start valve 300, and the other end is connected to the working chamber 6 b of the automatic valve 100. The branch pipe 71 branches from the downstream side of the start valve 300 of the first pipe 70 and is connected to the port P3 of the initial water discharge pressure control valve 200. The second pipe 72 has one end connected to the secondary flow path 3 of the automatic valve 100 and the other end connected to the secondary pressure introducing chamber 58 of the pressure regulating valve 500. The third pipe 73 branches from the first pipe 70 and is connected to the primary pressure introduction port 61 of the pressure regulating valve 500. Furthermore, the fourth pipe 74 has one end connected to the inside of the case 12 (adjuster 13) of the automatic valve 100 and the other end connected to the input port P1 of the on-off valve 46. Note that the third pipe 73 may be directly connected to the working chamber 6 b without passing through the first pipe 70. Further, the case 12 and the input port P1 of the on-off valve 46 may be directly connected without using the fourth pipe 74.

  Next, the operation of the automatic valve device configured as described above will be described with reference to FIGS. 2 is a diagram for explaining a low-pressure water discharge state in the automatic valve device according to the present invention, FIG. 3 is a diagram for explaining a specified pressure water discharge state in the automatic valve device according to the present invention, and FIG. 4 is a diagram in the automatic valve device according to the present invention. It is a figure explaining the state at the time of recovery.

  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.

  Subsequently, 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 side flow path 2 passes through the first pipe 70 into the working chamber 6b. To fill and fill. At this time, inflow of the primary side pressurized water into the adjuster 13 is blocked by the large diameter portion 14a, the pressure in the working chamber 6b rises, and the piston 9 moves to the left 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. When the large-diameter portion 14 a comes out of the adjuster 13, the working chamber 6 b communicates with the fourth pipe 74. Therefore, the primary pressurized water that has flowed into the working chamber 6b flows into the fourth pipe 74, flows into the normally open on-off valve 46 from the input port P1, and is drained from the output port P2. Therefore, the pressure in the working chamber 6b is kept constant, and no further moving force acts on the piston 9, and the main valve 7 is maintained at the initial opening as shown in FIG.

  Therefore, 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. At this time, the water discharged from the water discharge head 16 becomes a preliminary low-pressure water discharge.

  On the other hand, simultaneously with the opening of the pilot valve 18 or the manual start valve 19, the primary side pressurized water in the primary side flow path 2 flows through the first pipe 70 and the branch pipe 71 and is added from the port P 3 of the initial water discharge pressure control valve 200. It is supplied to the pressure chamber 37. When the primary pressurized water fills the pressurizing chamber 37, the first piston 33 is lowered. Then, the lowering force of the first piston 33 is transmitted to the second piston 34 via the operating spring 35 and acts to lower the shaft 42. At this time, a large resistance force of the silicone oil 41 acts on the braking partition plate 43, and instead of the second piston 34 descending, the operating spring 35 contracts and the first piston 33 descends to the lower limit.

  Next, the operating spring 35 extends while receiving the resistance force of the silicone oil 41 and the reaction force of the return spring 36. In conjunction with the extension operation of the operating spring 35, the silicone oil 41 in the second oil chamber 40b flows into the first oil chamber 40a from the orifice 44, and the shaft 42, that is, the second piston 34 gradually descends. And if the 2nd piston 34 descend | falls to a minimum, it will be pressed by the front-end | tip of the shaft 42, and the valve body 45 will close the flow path between the input port P1 and the output port P2.

  Thereby, drainage of the primary side pressurized water from the output port P2 is stopped. Therefore, the pressure in the working chamber 6b rises again by the primary-side pressurized water flowing from the first pipe 70, and the piston 9 moves to the left in FIG. As a result, the main valve 7 is further opened, and the flow rate of the primary pressurized water flowing from the primary side flow path 2 into the secondary side flow path 3 increases.

The secondary-side pressurized water in the secondary-side flow path 3 closes the automatic drain valve 21 and is supplied to the secondary pressure introduction chamber 58 of the pressure regulating valve 500 via the second pipe 72. And when the pressure of the secondary side pressurized water in the secondary side flow path 3 rises and becomes higher than a predetermined pressure, the pressure regulating valve 500 is opened. As a result, the primary pressurized water supplied into the working chamber 6 b of the automatic valve 100 via the first pipe 70 flows into the primary pressure introducing chamber 60 from the third pipe 73 and from the drain port 62 of the pressure regulating valve 500. Drained. Therefore, the pressure in the working chamber 6b is kept constant, no further moving force acts on the piston 9, and the main valve 7 is maintained at the set opening.
Therefore, as shown in FIG. 3, the primary side pressurized water flows from the primary side channel 2 into the secondary side channel 3, and the secondary side pressurized water having a predetermined pressure flows through the secondary side pipe 15. The water is discharged from the water discharge head 16. At this time, the water discharged from the water discharge head 16 becomes full-scale water discharge (specified pressure discharge) discharged at a specified pressure.

  When the full-scale water discharge from the water discharge head 16 is completed and the pilot valve 18 and the manual activation valve 19 are closed, the supply of primary pressurized water to the working chamber 6b of the automatic valve 100 via the first pipe 70 is stopped. The primary pressurized water in the working chamber 6b and the first pipe 70 leaks from the groove portion 67 of the valve seat 66 of the pressure regulating valve 500 through the third pipe 73 and the primary pressure introduction chamber 60, and flows out to the atmosphere. . Therefore, the pressure of the primary side pressurized water in the working chamber 6b decreases, and the main valve 7 is closed by the biasing force of the spring 8, and the piston 9 moves to the initial state (monitoring state). At the same time, the supply of the primary pressurized water from the port P3 via the branch pipe 71 is stopped, and the second piston 34 and the shaft 42 start to rise by the return force of the return spring 36. The first piston 33 rises in synchronization with the rise of the second piston 34. At this time, the silicone oil 41 flows from the first oil chamber 40a into the second oil chamber 40b and returns to the initial state.

And the valve body 45 raises, the flow path between the input port P1 and the output port P2 is open | released, and the primary side pressurized water in the 4th piping 74 is drained.
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 58 passes through the second pipe 72. The automatic drain valve 21 is drained.

  Next, when checking the opening / closing operation of the automatic valve 100 or checking the setting of the pressure adjustment valve 500, the water control valve 25 is closed 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 300 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 500 is confirmed.

  In the automatic valve device configured as described above, a groove portion 67 is formed in the valve seat 66 of the pressure regulating valve 500 to constitute a valve closing mechanism for the main valve 7 after the full-scale water discharge is stopped. Further, during the operation of the automatic valve device, the valve body 64 contacts and separates from the valve seat 66 by the specified pressure setting operation of the pressure regulating valve 500. Therefore, even if the foreign matter is clogged in the groove portion 67 or the product is generated in the groove portion 67, the foreign matter or product is repeatedly generated in the flow of the high-pressure primary-side pressurized water when the valve body 64 is separated from the valve seat 66. It is exposed and finally poured out with the primary side pressurized water. Therefore, the automatic valve which can avoid the trouble that the gap by the groove portion 67 is narrowed, the valve closing time of the main valve 7 is lengthened, or the main valve 7 cannot be closed, and realizes a stable operation in the long term. A device is obtained.

  In addition, since the pressure adjusting bolt 56 is attached to the spring case 53 and the length of the spring 54, that is, the spring load can be adjusted, the specified pressure for full-scale water discharge can be set for each site.

In addition, in the said embodiment, although the groove part shall be formed in a valve seat, you may form a groove part in a valve body.
In the above embodiment, the groove portion is formed in the valve seat, but the gap forming means is not limited to the groove portion, and it is sufficient that a predetermined total cross-sectional area is ensured when the valve is closed. The contact surface between the valve body and the valve seat may be an uneven surface. Moreover, you may make it the surface shape of the fitting part of a valve body and a valve seat differ, for example, it is good also considering a valve seat as circular and a valve body as an ellipse.
In the above embodiment, the automatic valve device that performs low-pressure water discharge before the specified pressure water discharge is described as an example. However, the present invention can also be applied to an automatic valve device that does not perform low-pressure water discharge.

  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), 51 Diaphragm (valve drive mechanism), 53 Spring case (valve drive mechanism), 54 Spring (valve drive mechanism), 57 Valve body, 58 Secondary pressure introduction chamber, 59 Secondary pressure Introduction port, 60 Primary pressure introduction chamber, 61 Primary pressure introduction port, 63 Valve rod (valve drive mechanism), 64 Valve body (valve part), 66 Valve seat (valve part), 67 Groove part, 70 First piping, 72 2 piping, 73 3rd piping, 100 automatic valve, 300 starting valve, 500 pressure regulating valve.

Claims (5)

A body portion having a primary flow path and a secondary flow path partitioned by a valve seat, a main valve disposed in the primary flow path so as to be able to contact and separate from the valve seat, and the main valve An urging means for urging in a direction in contact with the valve seat, opposed to the main valve via the secondary flow path, and projecting from the trunk main body with the axial direction as the contact / separation direction of the main valve The cylinder is slidably disposed in the cylinder and the cylinder is moved by supplying primary pressurized water to a working chamber defined on the opposite side of the secondary flow path in the cylinder. An automatic valve having a piston for opening the main valve;
A secondary pressure introduction chamber, a primary pressure introduction chamber, a valve portion that opens and closes the primary pressure introduction chamber with respect to the atmosphere, and that is formed with a predetermined gap when closed, and the secondary pressure introduction chamber A pressure regulating valve having a valve drive mechanism for opening the valve portion when the pressure reaches a predetermined pressure;
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 the 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 state where the primary side pressurized water is supplied to the working chamber via the first pipe by the start valve, the secondary pressure introduction chamber supplied from the secondary side channel via the second pipe. When the pressure of the secondary side pressurized water reaches the predetermined pressure, the valve portion is opened, and the primary side pressurized water in the working chamber is caused to flow out to the atmosphere to reduce the pressure of the primary side pressurized water in the working chamber, and the secondary pressure If the pressure of the secondary side pressurized water in the introduction chamber does not reach the predetermined pressure, the valve portion is closed to increase the pressure of the primary side pressurized water in the working chamber, and the pressure of the secondary side pressurized water in the secondary pressure introduction chamber is increased. Controlling the opening of the main valve to achieve the predetermined pressure,
In a state where the primary side pressurized water is not supplied to the working chamber via the first pipe by the start valve, the primary side pressurized water is passed through the third pipe and the primary pressure introducing chamber to the gap. The automatic valve device is configured to close the main valve by lowering the pressure of the primary pressurized water in the working chamber by flowing it out to the atmosphere. ^2. The automatic valve device according to claim 1, wherein the gap is formed in the valve portion so that a total cross-sectional area thereof is 0.4 mm ² or more and 4 mm ² or less. Secondary pressure introduction chamber, secondary pressure introduction port for introducing secondary pressure into the secondary pressure introduction chamber, primary pressure introduction chamber, primary pressure introduction port for introducing primary pressure into the primary pressure introduction chamber, primary pressure introduction A valve body having a valve part for opening and closing the chamber to the atmosphere;
When the secondary pressure in the secondary pressure introduction chamber reaches a predetermined pressure, the valve portion is opened, and when the secondary pressure in the secondary pressure introduction chamber is less than the predetermined pressure, the valve portion is closed. A mechanism,
The pressure regulating valve, wherein the valve portion has a predetermined gap that communicates the primary pressure introducing chamber and the atmosphere when the valve is closed.   The valve drive mechanism includes a spring case attached to the valve body with the secondary pressure introduction chamber interposed therebetween, a diaphragm sandwiched between the valve body and the spring case and defining the secondary pressure introduction chamber, A spring disposed in the spring case for applying a predetermined load to the diaphragm; and a shaft bar that moves in conjunction with the displacement of the diaphragm and opens and closes the valve portion. The pressure regulating valve according to claim 3. The pressure regulating valve according to claim 3 or 4, wherein the gap is formed in the valve portion so that a total cross-sectional area thereof is 0.4 mm ² or more and 4 mm ² or less. .

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