JP2007255650A - Stepwise water discharge automatic valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stepwise water discharge automatic valve device for ensuring change-over from initial water discharge into specified pressure water discharge after a certain time passes without the need for troublesome adjusting work at a site. <P>SOLUTION: The automatic valve 100 comprises a main valve 6, a piston 16 for opening the main valve 6 with the supply of primary side pressure water into an operation chamber 5b in a cylinder 5, a spring 14 for closing the main valve 6, and a shaft 26 and an adjuster 23 for maintaining the opening of the main valve 6 with the draining of the pressure water in the operation chamber 5b when the main valve 6 has an initial opening. It also has a starting valve 300 for supplying the primary side pressure water to the operation chamber 5b and a timer valve 200, the timer valve 200 for further opening the main valve 6 with the draining stop of the pressure water from the operation chamber 5b at a certain delay time after supplying the primary side pressure water, and a pressure regulating pilot valve 400 for keeping the main valve 6 at a set opening with the draining of the pressure water in the operation chamber 5b when pressure generated in a secondary side flow path 3 reaches predetermined pressure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a staged water discharge automatic valve device that is installed in a tunnel such as a highway, for example, and realizes staged water discharge.

  A conventional automatic stage water discharge valve device is slidable to a main cylinder with a main valve arranged to be openable and closable with respect to a valve seat that partitions the primary and secondary sides of the valve body, and a main piston that drives the main valve to open and close As the main piston moves, a circulation path that can freely flow in and out of the main cylinder closing and pressurizing side is formed as the main piston moves, and the circulation path is shut off when the main piston reaches a predetermined initial opening degree. An automatic valve with a stop control mechanism that stops the main piston, a start valve that is activated by supplying primary pressure water to the open pressure side of the main cylinder, and a secondary valve that opens after the main valve is opened to the initial opening An initial water discharge pressure control valve that operates according to the generated water discharge pressure, bypasses the shut-off part of the circulation path and releases the stop of the main piston, and a disc by controlling the inflow and outflow amount of the secondary pressure water to the cylinder chamber Move after a certain delay time A pressure control valve that switches from a low pressure setting to a predetermined specified pressure setting, and controls the secondary side discharge pressure to the set low pressure setting or the specified pressure setting by driving the main valve by adjusting the pressure of the main cylinder chamber. (For example, refer to Patent Document 1).

JP 2005-248970 A

  The conventional stage water discharge automatic valve device switches from low pressure discharge to specified pressure discharge using the pressure fluctuation of the secondary side pressure water. The stem position that defines the initial opening of the main valve in the automatic valve, the initial water discharge Adjust the adjustment bolt position that regulates the operating water discharge pressure in the pressure control valve, the stopper position that defines the delay time in the pressure control valve, the needle opening, etc. on site to adjust the switching time from low pressure discharge to specified pressure discharge. It was necessary to set. When the adjustment amount of one adjustment item is changed, the adjustment amounts of the other adjustment items are changed. That is, these adjustment amounts interfere with each other, and it takes time for adjustment work in the field. Furthermore, if the adjustment is incorrect, there is a problem that the initial water discharge is not changed from the initial water discharge to the specified pressure water discharge.

  The present invention has been made to solve the above problems, eliminates mutual interference between the adjustment of the initial water discharge and the adjustment of the specified pressure water discharge, eliminates the complicated adjustment work at the site, and a predetermined time from the initial water discharge. It aims at obtaining the stage water discharge automatic valve apparatus which made it switch to specified pressure water discharge reliably after progress.

  A stage water discharge automatic valve device according to the present invention includes a main valve disposed so as to be able to contact with and separate from a valve seat that partitions a primary flow path and a secondary flow path of a valve body, and the axial direction of the main valve A cylinder that is slidably disposed in the cylinder and moved by the supply of primary pressurized water to the working chamber defined on the open pressure side in the cylinder to open the main valve. An automatic valve having a main valve drive mechanism having a piston to be moved, a stop control mechanism for stopping movement of the piston when the main valve reaches a predetermined initial opening, and the primary side in the working chamber Generated in the start valve that supplies the pressurized water to start, a timer valve that releases the stop of the main valve by the stop control mechanism after the primary side pressurized water is supplied from the start valve, and the secondary side flow path The primary side in the working chamber according to the pressure of the secondary side pressurized water By adjusting the position of the piston by adjusting the pressure water, and a, a pressure regulating pilot valve for maintaining the pressure of the secondary side pressurized water to a predetermined specified pressure.

According to this invention, the primary side pressurized water is supplied to the working chamber and the timer valve by the operation of the start valve. When the primary pressurized water is supplied to the working chamber and the pressure in the working chamber increases, the piston moves and the main valve is opened. Next, when the main valve reaches a predetermined initial opening, the movement of the piston is stopped by the stop control mechanism. Therefore, the main valve is maintained at a predetermined initial opening, the primary-side pressurized water flows into the secondary-side flow path, and the initial water discharge (low-pressure water discharge) is easily performed. Thereby, the pressure regulating function for the initial water discharge becomes unnecessary, and the adjustment of the stop control mechanism does not affect the function of the pressure regulating pilot valve. In addition, the timer valve stops draining the primary pressurized water from the working chamber and further opens the main valve after a predetermined delay time has elapsed since the primary pressurized water was supplied. Therefore, the amount of primary-side pressurized water flowing from the primary-side flow path to the secondary-side flow path increases, and specified pressure water discharge (high-pressure water discharge) is performed by the pressure regulating pilot valve. Furthermore, when the pressure of the secondary side pressurized water reaches a predetermined pressure, the primary side pressurized water in the working chamber is drained, the main valve is maintained at the set opening degree, and the water discharge pressure is maintained at the predetermined pressure. Thereby, after predetermined time progress from initial water discharge, it switches to specified pressure water discharge reliably.
Further, the adjustment of the initial opening of the main valve and the adjustment of the operating pressure of the pressure adjusting pilot valve can be performed without mutual interference, and the adjustment work is simplified.

  FIG. 1 is a block diagram showing a stage water discharge automatic valve device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a structure of a timer valve applied to the stage water discharge automatic valve device according to one embodiment of the present invention. FIG. 4 is a cross-sectional view showing a low-pressure water discharge state of an automatic valve in a stage water discharge automatic valve device in one embodiment of the present invention, and FIG. 4 shows a specified pressure water discharge state of the automatic valve in the step water discharge automatic valve device in one embodiment of the present invention. It is sectional drawing.

  In FIG. 1, the stage water discharge automatic valve device includes an automatic valve 100 that adjusts the flow rate of primary pressurized water flowing from the primary side flow path 2 to the secondary side flow path 3 by changing the opening of the main valve 6, and the primary valve. Timer valve 200 that switches the opening degree of the main valve 6 from the initial opening degree to the set opening degree after a predetermined delay time is supplied, and the main valve drive mechanism and timer valve 200 of the main valve 6 of the automatic valve 100. And a regulation valve 300 for controlling the opening degree of the main valve 6 to a set opening degree by sensing that the pressure of the secondary side pressurized water has reached a predetermined pressure. And a pressure regulating pilot valve 400 as a pressure water discharge mechanism.

First, the structure of the automatic valve 100 will be described.
The valve body 1 includes a primary side flow path 2 to which a primary side pipe (not shown) is connected, a secondary side flow path 3 to which a secondary side pipe (not shown) is connected, and a primary side flow path 2. A communication hole 4 communicating with the secondary side flow path 3, a shaft centered on the hole center of the communication hole 4, and facing the communication hole 4 across the secondary side flow path 3. And a cylindrical cylinder 5 formed so as to open to the secondary flow path 3.

  The main valve 6 includes a disc portion 7, four guide portions 8 extending in the axial direction of the main valve 6 at an equiangular pitch in the circumferential direction from the vicinity of an edge on one side of the disc portion 7, and the disc portion 7 is provided with a stem fitting recess 9 that is recessed in a central portion on one side, and an O-ring 10 that is fitted on the outer periphery of the disk portion 7. The main valve 6 is slidably mounted by inserting the guide portion 8 into the communication hole 4 from the primary channel 2 side.

  The guide rod 11 protrudes from the central portion on the other side of the disk portion 7 and is slidably inserted into a rod insertion hole 12 a formed in the lid body 12. An O-ring 13 is interposed between the guide rod 11 and the rod insertion hole 12a to prevent fluid leakage from the primary side flow path 2 through the rod insertion hole 12a. Further, the spring 14 is contracted between the disc portion 7 and the lid body 12 to press the disc portion 7 toward the secondary flow path 3 side. As a result, the O-ring 10 is in close contact with the valve seat 4 a formed by the outer peripheral edge of the communication hole 4, and the flow path between the primary side flow path 2 and the secondary side flow path 3 is closed. Further, by the operation of the piston 16 described later, the guide rod 11 is guided to the rod insertion hole 12a and moves to the left in FIG. 1, the main valve 6 is separated from the valve seat 4a, and the primary side flow path 2 and the secondary side The channel between the side channel 3 is opened. Each O-ring is provided to prevent fluid leakage, and the description thereof is omitted below.

  The cylinder lid 15 is attached to the valve body 1 with an O-ring interposed so as to close the opening of the cylinder 5 on the side opposite to the secondary flow path 3. The piston 16 is slidably inserted into the cylinder 5, the O-ring 17 is fitted on the outer periphery of the piston 16, and the inside of the cylinder 5 is connected to the piston chamber 5 a on the secondary flow path 3 side and the cylinder lid. It is divided into 15 working chambers 5b. Further, a stopper 18 is provided in a radially protruding manner over the entire circumference in the opening end of the inner wall surface of the cylinder 5 on the secondary flow path 3 side, and the piston 16 moves toward the secondary flow path 3 side. The amount is regulated. An inflow / outflow channel 19 is formed in the cylinder lid 15 so as to communicate the working chamber 5b with the outside. Further, the stem 20 is fixed so that one end is fixed to the center position of the piston 16 and the other end is fitted into the stem fitting recess 9 of the disk portion 7 so that its axis coincides with the axis of the cylinder 5. It has been. Here, the main valve drive mechanism is constituted by the cylinder 5, the spring 14, the cylinder lid 15, the piston 16, the stem 20, and the like.

The cylinder lid 15 has an opening that is coaxial with the axis of the cylinder 5. A cylindrical case 21 is attached coaxially with the axis of the cylinder 5 with a flange portion formed on one end side of the case 21 interposed in an opening of the cylinder lid 15 with an O-ring interposed. . A drain port 22 is drilled to communicate the inside and outside of the case 21.
The lift setting adjuster 23 is manufactured in a cylindrical shape, and is screwed into a female screw portion formed on the inner wall surface on the other end side of the case 21 so as to be able to advance and retreat. A through hole 24 is formed so as to communicate with the inside and outside of the adjuster 23. A pair of O-rings 25 are interposed between the inner peripheral wall surface of the case 21 and the outer peripheral wall surface of the adjuster 23 so as to be separated from each other by a predetermined distance in the axial direction and sandwich the drain port 22 and the through hole 24.

A small diameter portion is formed in the center hole 27 at a position on the other end side of the through hole 24 of the adjuster 23. One end of the shaft 26 is fixed to the piston 16, and the other end is inserted into the small diameter portion of the center hole 27 of the adjuster 23 so as to coincide with the axis of the cylinder 5. The small diameter portion serves as a guide, and the shaft 26 moves in the axial direction of the cylinder 5 in conjunction with the movement of the piston 16. At this time, the large diameter portion 26 a projecting from one end of the shaft 26 slides on the inner wall surface of the center hole 27 of the adjuster 23.
Here, the case 21, the adjuster 23, the shaft 26, and the like constitute a stop control mechanism. The case 21 and the adjuster 23 correspond to a guide member, and the center hole 27 of the adjuster 23 corresponds to a guide hole.

  In addition, by changing the advance / retreat amount of the adjuster 23 with respect to the case 21, the large-diameter portion 26a is removed from the center hole 27 of the adjuster 23 from the initial state (the sliding relationship between the large-diameter portion 26a and the center hole 27 is lost). The stroke amount of the piston 16 is changed. That is, the initial opening degree of the main valve 6 is adjusted by adjusting the advance / retreat amount of the adjuster 23 with respect to the case 21.

Next, the structure of the timer valve 200 will be described with reference to FIG.
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 bottom of the first cylinder 30. It has become. An air hole 38 is formed in the first cylinder 30 so as to communicate the space on the side opposite to the pressure chamber in the first cylinder 30 defined by the first piston 33 and the outside. Further, a first piston position adjusting bolt 39 is screwed to the bottom 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. Further, O-rings are interposed between the shaft 42 and the separator 32 and between the shaft 42 and the bottom of the second cylinder 31 so that the silicone oil 41 can be prevented from leaking and slidably moved. It has become.

  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 and moves on the inner peripheral wall surface of the second cylinder 31 in conjunction with the movement of the shaft 42. A plate orifice 44 is formed in the braking partition plate 43 so as to communicate with the first and second oil chambers 40a and 40b. Further, a check valve 45 is formed on the partition plate 43 for braking. The check valve 45 prevents the silicone oil 41 from flowing into the first oil chamber 40a from the second oil chamber 40b when the shaft 42 moves toward the opening / closing valve 46, and the shaft 42 moves toward the pressurizing chamber 37. The silicone oil 41 is allowed to flow from the first oil chamber 40a to the second oil chamber 40b when moving.

  The on-off valve 46 is a valve body that opens and closes the input port P1, the output port P2, the valve body 47 that opens and closes between the input port P1 and the output port P2, and the input port P1 and the output port P2. And a spring 48 for urging 47, and is a normally open type. The on-off valve 46 is closed between the input port P1 and the output port P2 by the spring force of the operating spring 35 that acts on the valve body 47 via the shaft 42.

In the timer valve 200 configured in this way, the initial position of the first piston 33 is 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. 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 through the plate orifice 44 provided in the braking partition plate 43. Accordingly, the descending speed of the brake 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 plate orifice 44. Therefore, the lowering speed of the braking partition plate 43 becomes stable regardless of the environmental temperature.

  Here, the reason why the plate orifice 44 is not easily affected by the temperature characteristics of the fluid will be described, for example, in comparison with a conventional needle valve. In the case of a needle valve, the section where the fluid flows at a high flow rate is long, and a large wall friction loss occurs. Changes in fluid viscosity with temperature greatly affect this friction loss. On the other hand, in the plate orifice 44, the section flowing at a high flow velocity is short and the friction with the wall surface is small, so the change in fluid viscosity due to temperature does not affect.

  Further, the primary side pressurized water lowers the first piston 33 to the lower limit and does not act to lower the shaft 42. That is, the shaft 42 is lowered by the spring force accumulated in the operating spring 35 when the first piston 33 is lowered to the lower limit at which the first piston 33 contacts the separator 32 by the supply of the primary pressurized water. Therefore, the pressure fluctuation of the primary side pressurized water does not affect the delay time.

The pressure regulation pilot valve 400 is a normally closed type, and operates as a specified pressure water discharge mechanism when the pressure of the secondary side pressurized water in the secondary side flow path 3 reaches a predetermined pressure and opens. That is, by adjusting the operating pressure of the pressure regulation pilot valve 400, the pressure of the specified pressure water discharge is adjusted.
Here, one end of the first pipe 50 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 port P <b> 3 of the timer valve 200. The branch pipe 51 branches from the downstream side of the start valve 300 of the first pipe 50 and is connected to the inflow / outflow passage 19 of the automatic valve 100 and the input port of the pressure regulating pilot valve 400. The second pipe 52 has one end connected to the secondary side flow path 3 of the automatic valve 100 and the other end connected to the working chamber of the pressure regulating pilot valve 400. Further, the third pipe 53 has one end connected to the drain port 22 of the automatic valve 100 and the other end connected to the input port P1 of the on-off valve 46. The plate orifice 54 is disposed on the start valve 300 side of the connection portion of the first pipe 50 with the branch pipe 51.

Next, the operation of the stage water discharge automatic valve device configured as described above will be described.
First, when the start valve 300 is actuated, the primary pressurized water in the primary channel 2 flows into the working chamber 5b through the first pipe 50, the branch pipe 51, and the inflow / outflow channel 19 to be filled. At this time, the flow of primary pressurized water into the central hole 27 of the adjuster 23 is blocked by the large diameter portion 26a, the pressure in the working chamber 5b rises, and the piston 16 moves to the left in FIG. The moving force of the piston 16 is transmitted to the main valve 6 through the stem 20, and the main valve 6 moves to the left in FIG. 1 against the urging force of the spring 14. When the large diameter portion 26 a comes out of the center hole 27 of the adjuster 23, the working chamber 5 b is communicated with the third pipe 53 through the through hole 24 and the drain port 22. Therefore, the primary pressurized water that has flowed into the working chamber 5 b from the inflow / outflow channel 19 flows into the third pipe 53 via the through hole 24 and the drainage port 22. And the primary side pressurized water which distribute | circulated the inside of the 3rd piping 53 flows in into the normally open type on-off valve 46 from the input port P1, and is drained from the output port P2. Therefore, the pressure in the working chamber 5b is kept constant, and no further moving force acts on the piston 16, and the main valve 6 is maintained at the initial opening as shown in FIG.

  Therefore, the primary-side pressurized water flows from the primary-side flow path 2 into the secondary-side flow path 3 as indicated by arrows in FIG. And primary side pressurized water is filled in the secondary side flow path 3, becomes secondary side pressurized water, distribute | circulates secondary side piping (not shown), and is discharged from a water spray nozzle (not shown). At this time, water discharged from the water spray nozzle becomes low-pressure water discharge.

  On the other hand, simultaneously with the operation of the activation valve 300, the primary pressurized water in the primary channel 2 flows through the first pipe 50 and is supplied from the port P 3 of the timer valve 200 to the pressurizing 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, the check valve 45 is closed, and a large resistance force of the silicone oil 41 is generated. Therefore, 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 plate orifice 44, and the shaft 42, that is, the second piston 34 gradually descends. When the second piston 34 is lowered to the lower limit, the shaft 42 lowers the valve body 47 against the urging force of the spring 48, and the flow path between the input port P1 and the output port P2 is closed. At this time, the return spring 36 is contracted, and the return force is stored.

  Thereby, drainage of the primary side pressurized water from the output port P2 is stopped. Therefore, the pressure in the working chamber 5b rises again by the primary-side pressurized water flowing in from the inflow / outflow passage 19, and the piston 16 moves to the left in FIG. As a result, the main valve 6 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.

Secondary-side pressurized water in the secondary-side flow path 3 is supplied to the working chamber of the pressure regulation pilot valve 400 via the second pipe 52. 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 regulation pilot valve 400 is opened. As a result, the primary pressurized water supplied into the working chamber 5 b of the automatic valve 100 via the branch pipe 51 is drained from the output port of the pressure regulating pilot valve 400. Therefore, the pressure in the working chamber 5b is kept constant, and no further moving force acts on the piston 16, and the main valve 6 is maintained at the set opening as shown in FIG.
In addition, as the specified pressure discharge, the main valve 6 may be fully opened or the like, and the adjustment pilot valve 400 may not be provided if adjustment to a predetermined pressure is not necessary.
Therefore, the primary side pressurized water flows from the primary side channel 2 into the secondary side channel 3 as indicated by an arrow in FIG. 4, and the secondary side pressurized water that has reached a predetermined pressure passes through the secondary side pipe. It is distributed and discharged from the water spray nozzle. At this time, the water discharged from the water spray nozzle becomes the specified pressure water discharge.

Next, when the start valve 300 is closed, there is no supply of the primary side pressurized water to the working chamber 5b of the automatic valve 100 via the branch pipe 51, and the primary side pressurized water in the working chamber 5b is supplied to the pressure regulating pilot valve 400. Drained from the output port. Therefore, the main valve 6 is closed by the urging force of the spring 14, and the piston 16 moves to the initial state. At the same time, the supply of primary pressurized water from the port P3 is stopped, the return force of the return spring 36 is released, and the second piston 34 and the shaft 42 start to rise. The first piston 33 rises in synchronization with the rise of the second piston 34. At this time, the check valve 45 is opened, and the silicone oil 41 quickly flows from the first oil chamber 40a into the second oil chamber 40b and returns to the initial state.
Then, the valve body 47 of the on-off valve 46 is raised by the urging force of the spring 48, the flow path between the input port P1 and the output port P2 is opened, and the primary side pressurized water is drained into the third pipe 53.

Here, the timer valve 200 uses the silicone oil 41 as the fluid in the oil chamber 40, but other fluids such as water may be used, or primary pressurized water may be introduced.
Further, the timer valve 200 only needs to start the measurement of the delay time when the primary side pressurized water is supplied by the operation of the start valve 300 and can open the main valve 6 to the set opening degree. An electric timer that detects and measures the delay time may be used.

  According to the present invention, the primary side pressurized water is supplied to the timer valve 200 by the operation of the start valve 300 to start the delay time measurement, and after the delay time has elapsed, the main valve 6 is opened from the initial opening to the set opening. Therefore, it is possible to reliably shift to the specified pressure water discharge after the lapse of the delay time from the initial water discharge.

  In addition, the timer valve 200 has a normally open type on-off valve 46 that closes after the delay time elapses, and the drainage port 22 is connected to the input port P1 of the on-off valve 46 via the third pipe 53. Therefore, the on-off valve 46 drains the primary pressurized water in the working chamber 5b to maintain the main valve 6 at the initial opening, and the opening in the working chamber 5b to further open the main valve 6 from the initial opening. Since it has a function of stopping the drainage of the primary-side pressurized water, the parts can be shared and the number of parts can be reduced.

  Further, the initial opening degree of the main valve 6 can be adjusted by changing the advance / retreat amount of the adjuster 23 with respect to the case 21. Further, the pressure of the specified pressure water discharge can be adjusted by changing the operating pressure of the pressure regulation pilot valve 400. Further, the delay time can be adjusted by changing the advance / retreat amount of the first piston position adjusting bolt 39. Therefore, the respective adjustments do not interfere with each other, and the on-site adjustment work is remarkably simplified.

Further, since the timer valve 200 uses the primary side pressurized water only as a trigger for starting the measurement of the delay time and measures the delay time by the operating spring 35, even if the primary side pressurized water fluctuates rapidly, the delay time The delay time can be accurately measured without affecting the measurement.
Further, the oil chamber 40 is filled with the silicone oil 41 and the braking partition plate 43 is moved, while the silicone oil 41 is moved from the second oil chamber 40b through the plate orifice 44 formed in the braking partition plate 43. Since it is made to move to the chamber 40a, there is no influence by the temperature characteristic of oil, and delay time can be measured correctly.

  In the above embodiment, the branch pipe 51 branched from the first pipe 50 is connected to the input / output flow path 19 and the input port of the pressure regulating pilot valve 400. However, a new drainage port is provided in the cylinder lid 15. Alternatively, the branch pipe 51 branched from the first pipe 50 may be connected only to the inflow / outflow passage 19, and the newly provided drainage port and the input port of the pressure regulation pilot valve 400 may be connected by another pipe.

It is a block diagram which shows the stage water discharge automatic valve apparatus in one Example of this invention. It is sectional drawing which shows the structure of the timer valve applied to the stage water discharge automatic valve apparatus in one Example of this invention. It is sectional drawing which shows the low pressure water discharge state of the automatic valve in the stage water discharge automatic valve apparatus in one Example of this invention. It is sectional drawing which shows the normal pressure water discharge state of the automatic valve in the stage water discharge automatic valve apparatus in one Example of this invention.

Explanation of symbols

  1 valve body, 2 primary flow path, 3 secondary flow path, 4a valve seat, 5 cylinder (main valve drive mechanism), 5b working chamber, 6 main valve, 14 spring (main valve drive mechanism), 15 cylinder lid Body (main valve drive mechanism), 16 piston (main valve drive mechanism), 20 stem (main valve drive mechanism), 21 case (stop control mechanism), 22 drainage port, 23 adjuster (stop control mechanism), 26 shaft (stop) Control mechanism), 46 on-off valve, 53 third piping, 200 timer valve, 300 start valve, 400 pressure regulation pilot valve (regulated pressure water discharge mechanism).

Claims (4)

A main valve disposed so as to be able to come into contact with and separate from a valve seat that partitions the primary flow path and the secondary flow path of the valve body, and a cylinder whose axial direction is the contact direction of the main valve, the cylinder A main valve drive mechanism having a piston that is slidably disposed in the cylinder and moves by the supply of primary pressurized water to a working chamber defined on the open pressure side in the cylinder to open the main valve; A stop control mechanism for stopping the movement of the piston when the main valve reaches a predetermined initial opening;
A starting valve for supplying the primary pressurized water to the working chamber and starting it;
A timer valve for releasing the stop of the main valve by the stop control mechanism after the primary side pressurized water is supplied from the start valve;
By adjusting the pressure of the secondary side pressurized water in the working chamber according to the pressure of the secondary side pressurized water generated in the secondary side flow path and adjusting the position of the piston, the pressure of the secondary side pressurized water is regulated to a predetermined value. A pressure regulating pilot valve that maintains the pressure,
A stage water discharge automatic valve device characterized by comprising: The stop control mechanism drains the primary-side pressurized water in the working chamber and stops the movement of the piston.
The stage water discharge automatic valve device according to claim 1, wherein the timer valve stops drainage of the primary-side pressurized water from the working chamber after a predetermined delay time elapses and operates the pressure regulating pilot valve.   The stop control mechanism is arranged so that one end thereof is fixed to the piston and is disposed so as to be movable in the axial direction of the cylinder in synchronization with the position of the piston and to face the working chamber. A drainage port and a guide member that communicates the drainage port with the working chamber and has a guide hole into which the other end side of the shaft is inserted to guide movement in the axial direction of the shaft, When the piston moves until the main valve reaches the initial opening, the communication between the working chamber and the drainage port through the guide hole is closed, and the main valve reaches the initial opening. 3. The structure according to claim 1, wherein the piston is configured to release the closed communication between the working chamber and the drainage port via the guide hole when the piston moves thereafter. Step Water discharge automatic valve device.   The timer valve is provided with a normally open type on / off valve that is closed after a predetermined delay time has elapsed after the primary side pressurized water is supplied from the start valve, and the drain port is connected to the input port of the on / off valve via a pipe. It is connected, The stage water discharge automatic valve apparatus of any one of Claim 1 thru | or 3 characterized by the above-mentioned.

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