JP2005273847A - Pressure responsive control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure responsive control valve capable of certainly making the opening motion owing to its fail-safe function even if a diaphragm is broken. <P>SOLUTION: The pressure responsive control valve consisting in an initial water-discharge pressure control valve 15 is equipped with a fail-safe mechanism which moves a spool valve 108 to the open position using a pressure water flowing out through the broken part when the diaphragm 104 is broken. The fail-safe mechanism leads the pressure water flowed out with the breakage of the diaphragm 104 to a fail-safe diaphragm chamber 126 from a communication hole 110 formed along the inner stem direction of the spool valve 108 so as to move the spool valve 108 forcedly to the open position with the displacement of the fail-safe diaphragm 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a pressure responsive control valve used for an automatic valve device of a water spray facility installed in a tunnel such as a highway and a motorway.

  Conventionally, water spray equipment has been installed as emergency equipment in tunnels such as expressways and automobile roads that exceed a certain length, and if a fire breaks out in the tunnel, it corresponds to the fire occurrence zone. By activating the installed automatic valve device, water is discharged from the water spray head to suppress fire and prevent the spread of fire.

  By the way, in the event of a fire, if the water spray facility is activated and water discharge is started without prior notice, visibility of the discharged water area cannot be secured, a traffic vehicle can cause an accident, and an evacuee can evacuate quickly. Since there is a possibility that it will disappear, a preliminary water discharge is performed to notify that the water spray facility has started by discharging water at a low pressure at the time of startup, and after a certain delay time, for example, 10 seconds later, the pressure is raised to a specified pressure and the original water discharge is started. Step-by-step water discharge control is performed.

  In order to realize such a step-by-step water discharge function, the secondary valve pressure of the main valve provided in the automatic valve device is controlled in two steps of a low pressure and a specified pressure. A pressure control pilot valve for full-scale watering is provided separately, and the timer unit using silicon oil operates to control the low pressure of the automatic valve with the pressure control pilot valve for notice watering first, and the pressure control for full-scale watering after a predetermined delay time The control is switched to the specified pressure control by the pilot valve.

  However, in such an automatic valve device having a conventional stage water discharge function, a pilot valve for pressure adjustment is required according to the control pressure such as low pressure and specified pressure, and the device configuration is complicated and the cost is increased. Therefore, the present inventor has proposed an automatic valve device used in a water spray facility for tunnels that realizes stepwise water discharge with a simple configuration (Japanese Patent Application No. 2004-55716). .

  The automatic valve device proposed by the present inventor includes an automatic valve, a start valve, an initial water discharge pressure control valve using a pressure response control valve, and a pressure adjustment valve.

  The automatic valve has a main valve that is slidably mounted on a main cylinder that is slidably disposed on a valve seat that partitions the primary and secondary sides in the valve body, and a main piston that opens and closes the main valve. 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, and when the main piston reaches a predetermined initial opening, the circulation path is shut off and the main piston is stopped. A stop control mechanism.

  The activation valve is activated by supplying primary pressure water to the open pressure side of the main cylinder. An initial water discharge pressure control valve using a pressure responsive control valve is operated by a predetermined initial water discharge pressure generated on the secondary side after the main valve is opened to the initial opening, bypassing the shut-off portion of the circulation path and Release the piston stop.

  Further, the pressure regulating valve switches from a predetermined low pressure setting to a predetermined specified pressure after a predetermined delay time by moving the disc by controlling the amount of secondary side pressure water flowing into and out of the cylinder chamber, and changes the main pressure by adjusting the pressure in the main cylinder chamber. The secondary discharge pressure is adjusted to the set low pressure or the set regulation by driving the valve.

As described above, the function of one pressure regulating valve is realized by setting the predetermined delay time in the low pressure setting for the preliminary water discharge, setting the predetermined delay time in the pressure control state by the low pressure setting, and switching to the specified pressure setting for the full water discharge when the delay time elapses. Thus, the apparatus configuration can be simplified and the cost can be reduced.
JP 2002-355324 A

  However, in the automatic valve device proposed by the present inventor, an initial water discharge pressure control valve that functions as a pressure responsive control valve uses a structure that opens the valve by detecting the set pressure by the displacement of the diaphragm. In such a case, the rubber diaphragm may be damaged in an installation state for a long period of time.

  Thus, when the diaphragm is damaged, even if the secondary side pressure is generated by opening the start valve and opening the automatic valve to the initial opening, the initial water discharge pressure control valve cannot be opened, As a result, there is a risk of a very dangerous situation in which the water discharge from the head remains in the pre-release water discharge and does not switch to the full-scale water discharge in the event of a fire in the tunnel.

An object of the present invention is to provide a highly reliable pressure-responsive control valve that can be reliably opened even if a diaphragm is damaged.

  In order to achieve this object, the present invention is configured as follows. The present invention includes a diaphragm provided in a diaphragm chamber into which pressure water is introduced from a pressure detection port, a spring that applies a set load corresponding to a predetermined set pressure to the diaphragm, and an introduction pressure applied to the diaphragm that is equal to or lower than the set pressure. A pressure responsive control valve having a valve member that is in a closed position and moves to an open position by displacement against a diaphragm spring when a set pressure is exceeded, and communicates an input port and an output port. A fail-safe mechanism is provided that moves the valve member to the open position using pressure water flowing out through the damaged portion when the valve is damaged.

  Here, the fail-safe mechanism is provided in a fail-safe diaphragm chamber arranged in tandem with respect to the diaphragm chamber, and is fixed to the end of the valve member that moves the valve member to the open position by pressure water that has flowed out due to damage to the diaphragm A safe diaphragm and a communication hole formed in the inner axial direction of the valve member that communicates the spring contact side of the diaphragm with the fail-safe diaphragm chamber.

  In another form of the fail-safe mechanism in the pressure-responsive control valve of the present invention, the valve member is provided in the fail-safe cylinder chamber arranged in tandem with respect to the diaphragm chamber, and the pressure member that has flowed out due to damage to the diaphragm. A fail-safe piston that is moved to an open position and a fail-safe pipe that connects the spring contact side of the diaphragm to the fail-safe cylinder chamber are provided.

  Further, in another form of the fail-safe mechanism in the pressure responsive control valve of the present invention, the valve member is provided by the pressure water which is provided in the fail-safe cylinder chamber arranged in tandem with respect to the diaphragm chamber and flows out due to the diaphragm breakage. A fail-safe piston that is moved to an open position, and a communication hole that is formed in the internal axial direction of the valve member that communicates the spring contact side of the diaphragm with the fail-safe diaphragm chamber.

In the pressure responsive control valve according to the present invention, a small hole for leaking pressure water that has flowed out due to damage to the diaphragm is provided in a cover mounted on the spring contact side of the diaphragm.

When the pressure responsive control valve of the present invention is used as an initial water discharge pressure control valve in an automatic valve device of a tunnel water spray facility, for example, even if the rubber diaphragm is damaged, the pressure water that has flowed out of the damaged portion of the diaphragm Can be introduced into the fail-safe mechanism to forcibly move the valve member in the opening direction, the automatic valve device can be reliably switched to full-scale water discharge, and the reliability of the initial water discharge pressure control valve can be greatly improved. .

  FIG. 1 is an explanatory view showing an embodiment of an automatic valve device according to the present invention. 1, the automatic valve device of the present invention basically comprises an automatic valve 10, a start valve 12, an initial water discharge pressure control valve 15, a pressure adjustment valve 16, and a water storage tank 52, and further includes a pressure switch 46 and an automatic drain valve 48. And the test water discharge valve 50 is provided.

  The automatic valve 10 has an inlet 22 on one side of the valve body 20, an outlet 24 on the other side, piping from the pump facility is connected to the inlet 22 side, and the outlet 24 has a water discharge installed in the tunnel. The pipe on the head side is connected. Details of the automatic valve 10 are shown in FIG.

  In FIG. 2, the automatic valve 10 has a partition wall 26 inside the valve body 20, and the main valve 30 is disposed in the valve hole 55 of the partition wall 26. A valve seat 28 is formed in the upper portion of the valve hole 55, and the valve is closed by pressing a valve seal 56 provided on the main valve 30 against the valve seat 28.

  The main valve 30 is connected to a main piston 32 provided integrally with a sleeve 32a. The main piston 32 is slidably provided on the main cylinder 34, and an open pressurizing side cylinder chamber 34a is formed below the main piston 32, and a closed pressurizing side cylinder chamber 34b is formed above. A cylinder cylinder 38 is disposed inside the main cylinder 34, and the main piston 32 is also slidably inserted into the cylinder cylinder 38.

  A cover 62 is mounted on the upper part of the main cylinder 34, and a drive shaft 36 with a stem 40 functioning as a spool rod is disposed in the cover 62. The lower end of the drive shaft 36 is fixed to the main valve 30 by tightening a nut. ing. The stem 40 is provided with a seal 66 functioning as a valve body in the middle, and a spool valve seat 64 is formed at a position in the cover 62 in the vicinity of the seal 66.

  Cylinder ports C1 and C2 are provided for the main cylinder 34. As shown in FIG. 1, primary pressure water is introduced into the cylinder port C1 via pipes L1, L2, and L3. The piston 32 can be moved upward. At this time, the closed pressurizing side cylinder chamber 34b located on the upper side is filled with water in advance, and the water in the closed pressurizing side cylinder chamber 34b is discharged from the cylinder port C2.

  The cover 62 having the stem 40 is provided with a port S1 as a first port and a port S2 as a second port. The spool valve seat 64 is located between the ports S1 and S2. The main valve 30 is integrally formed with a guide portion 30a on the lower side, and when the main valve 30 is opened and closed, the guide portion 30a is slid with respect to the valve hole 55 to perform positioning at the time of opening and closing.

  Referring again to FIG. 1, a primary pressure outlet 42 is provided on the primary side opened to the inlet 22 side of the automatic valve 10, from which a pipe L <b> 1 is connected to the start valve 12. . The start valve 12 is connected to the manual start valve 14 in parallel. The secondary side of the start valve 12 is connected to the input port P1 of the pressure regulating valve 16 by a pipe L2. The output port P2 of the pressure regulating valve 16 is connected to a cylinder port C1 for the open pressurizing side cylinder chamber 34a of the automatic valve 10 via a pipe L3.

  Further, a secondary pressure outlet 44 is provided on the secondary side opened to the outlet 24 of the automatic valve 10, and a pipe L <b> 8 is drawn out from this and connected to the port P <b> 4 of the pressure regulating valve 16. Further, the pipe L8 is connected to the pressure detection port P3 of the pressure regulating valve 16, and then connected to the initial water discharge pressure control valve 15 side. Further, as shown on the secondary pressure outlet 44 side, a pressure switch 46 is connected to the pipe L8, and an automatic drain valve 48 is connected to the drain side, and a test water discharge valve 50 is connected in parallel with this. Yes.

  The cylinder port C2 of the closed pressurizing side cylinder chamber 34b of the automatic valve 10 is connected to the pipe L5, and further connected to the port S1 on the stem 40 side via the pipe L4. Further, the port S2 on the stem 40 side is connected to a pipe L6, and this pipe L6 is connected to a pipe L8 from the pressure regulating valve 16 side.

  Here, the pipe L5, the pipe L4, the port S1, and the flow path around the stem 40, the port S2, and the pipe L6 on the stem 40 side of the automatic valve 10 are closed and pressurized when the main piston 32 is driven to the open side. A circulation path for discharging water from the cylinder chamber 34b is formed, and the stop control mechanism of the automatic valve device of the present invention is constituted by the circulation path, the stem 40 and the seal 66 thereof.

  The stop control mechanism controls the opening degree of the main valve 30 when the primary pressure water is introduced into the open pressure side cylinder chamber 34a by driving the start valve 12 and the main piston 32 is driven to open the valve seat 28. It has a function for moving to an initial opening degree shown in advance and stopping. That is, referring to the automatic valve 10 in FIG. 2, when the main piston 32 moves upward upon receiving the introduction of the primary pressure water into the open pressurization side cylinder chamber 34a, it is attached to the drive shaft 36 accordingly. The stem 40 is also raised.

  In the initial state, the port S1 and the port S2 on the stem 40 side communicate with each other via an internal flow path. However, when the stem 40 rises and the seal 66 abuts against the spool valve seat 64, the ports S1 and S2 are not connected. As a result, the discharge of water from the cylinder port C2 in FIG. 1 stops, the main piston 32 stops, and the main valve 30 maintains a predetermined initial opening.

  The initial water discharge pressure control valve 15 supplies pressurized water to the secondary side with the automatic valve 10 opened to the initial opening, and receives the generation of the secondary side pressure when the preliminary water discharge is performed from the head. It operates and communicates between the pipe L4 and the pipe L7. For this reason, it has the input port I1, the output port I2, and the pressure detection port I3, and the initial water discharge pressure control valve 15 represents the closed state of the valve by separating the arrow 15a from the pipe L7 side in FIG. .

  When the secondary side pressure is generated after the automatic valve 10 is opened to the initial opening and the initial water discharge pressure control valve 15 is opened, the pipe L5 from the cylinder port C2 communicates with the pipe L7 through the initial water discharge pressure control valve 15. Since the pipe L7 is connected to the secondary side of the automatic valve 10 via the pipe L8, the stop of the main piston 32 of the automatic valve 10 is released, and the valve can be opened.

  The pressure regulating valve 16 controls the water discharge pressure P as shown in the time chart of FIG. In FIG. 3, when the start valve 12 is operated at time t0, the automatic valve 10 is opened to the initial opening, so that water for pressurization is supplied to the secondary side, and the secondary pressure is a pressure regulating valve via the pipe L8. 16 pressure detection ports P3. In the initial state, the pressure regulating valve 16 is in a low pressure setting state where the secondary side pressure is, for example, 0.15 MPa.

  The pressure regulating valve 16 has a function of switching the set pressure from the low pressure setting to the specified pressure setting after a predetermined delay time by driving the piston when the secondary pressure is received at the port P4, as will be clarified later. I have. For this reason, at time t2 when, for example, 10 seconds elapses from a time t1, for example, a time set within a range of 5 to 15 seconds, the pressure control by the low pressure setting is changed to the pressure control by the setting of the specified pressure, for example 0.34 MPa. Switch in stages. According to the pressure control of the water discharge pressure of FIG. 3, the pressure control for the preliminary water discharge is from time t0 to time t2, and the pressure control for full-scale water discharge is after time t2.

  FIG. 4A is a cross-sectional view of the initial water discharge pressure control valve 15 of FIG. 1 that functions as a pressure responsive control valve of the present invention, and FIG. 4B shows a symbol in a closed state.

  In FIG. 4A, the initial water discharge pressure control valve 15 has a cover 102 disposed on the upper part of the valve body 100a and a valve body 100b mounted on the lower side. A diaphragm 104 is provided on the upper portion of the valve body 100 a, and a diaphragm chamber 106 is formed on the lower side of the diaphragm 104. The diaphragm 104 is fixed to the upper portion of the spool valve 108 by tightening the nut 116 to the bolt portion while being sandwiched between the presser fitting 112 and the retainer 114.

  The spool valve 108 has a communication hole 110 that communicates from the upper end to the lower end in the central axis direction. A spring 118 is incorporated in the upper part of the retainer 114 to which the diaphragm 104 is fixed. The upper portion of the spring 118 is in contact with the retainer 122, and the tip of the set pressure adjusting screw 120 is in contact with the retainer 122.

  The spring 118 applies a spring load determined by the screwed position of the set pressure adjusting screw 120 to the spool valve 108, thereby determining a set pressure for the spool valve 108 to open.

  The valve body 100a is provided with an input port I1 and an output port I2. In this embodiment, the output port I2 also serves as a pressure detection port. The output port I2 communicates with the diaphragm chamber 106. A valve seat 109 is formed in a portion of the spool hole opened in the diaphragm chamber 106 of the spool valve 108, and the communication between the input port I1 and the output port I2 is cut off by contacting a seal 111 provided on the spool taper portion. Closed position.

  A fail-safe diaphragm 124 is arranged in tandem below the diaphragm 104. The fail-safe diaphragm 124 has an outer peripheral portion fixed between the valve body 100a and the valve body 100b, and presser fittings 128 and 130 are fixed to the center portion with nuts. Inserting. The upper gap of the fail safe diaphragm 124 communicates with the outside through the communication hole 125.

  Further, a small hole 103 is formed in the cover 102, and the pressure water leaked due to the breakage of the diaphragm 104 is caused to flow out of the small hole 103 so that the breakage of the diaphragm 304 can be confirmed from the outside.

  The initial water discharge pressure control valve 15 of FIG. 4A having such a structure is in a closed state, and is represented by a symbol as shown in FIG. 4B, and communication between the port I1 and the port I2 is cut off. .

  5A is a cross-sectional view of the initial water discharge pressure control valve of FIG. 1 that has been opened, and FIG. 5B is a symbol in an open state.

  In FIG. 5 (A), as shown in FIG. 1, the secondary side discharge pressure of the automatic valve 10 causes the main valve 30 to open to the initial opening at the output port I2 which also serves as a pressure detection port, as shown in FIG. Join when you open. The secondary pressure applied to the output port I2 is introduced into the diaphragm chamber 106. When the introduction pressure exceeds a set pressure determined by the pressing load of the spring 118, the diaphragm 104 is deformed upward, and the spool valve is resisted against the spring 118. Lift 108 upward.

  For this reason, the seal 111 of the spool valve 108 is opened away from the valve seat 109, the water in the closed pressurizing side cylinder 34b is used as pressure water, the input port I1 via the pipes L5 and L4, the gap portion of the opened valve seat 109, Through the diaphragm chamber 106, it communicates with the output port I2, and pressure water flows from the input port I1 to the output port I2.

  The state of the opening operation of the initial water discharge pressure control valve 15 is a state in which the port I1 and the port I2 communicate with each other by receiving the secondary pressure Pa, as indicated by a symbol in FIG.

  Next, a fail-safe operation when the diaphragm 104 is damaged will be described. When the secondary pressure is applied to the output port I2 in a state where the diaphragm 104 is damaged, the secondary pressure is applied to the damaged diaphragm 104 via the diaphragm chamber 106, and the cover 102 that houses the spring 118 from the damaged portion of the diaphragm 104. Flows out.

  The pressure water flowing into the cover 102 flows into the lower fail-safe diaphragm chamber 126 through the communication hole 110 formed in the central axis direction of the spool valve 108, deforms the fail-safe diaphragm 124 upward, and presses the presser fitting 128. The lower step portion of the spool valve 108 is brought into contact with this, thereby pushing up the spool valve 108 to the same open operation state as in FIG. 5 and causing the input port I1 and the output port I2 to communicate with each other.

  For this reason, in the initial water discharge pressure control valve 15 of the present invention, when the diaphragm 104 is damaged, if the secondary side pressure is applied to the output port I2 that also serves as the pressure detection port, the pressure water is removed from the damaged diaphragm 104. After flowing out, it flows into the lower fail-safe diaphragm chamber 126 and presses the fail-safe diaphragm 124. The fail-safe diaphragm 124 functions in place of the damaged diaphragm 104, and the pressure introduced from the output port I2 is a spring. When the set pressure determined by 118 is exceeded, the spool valve 108 is opened by the force of the fail-safe diaphragm 124, and the initial water discharge pressure control valve 15 can be normally operated.

  6 is a cross-sectional view of the pressure regulating valve 16 of FIG. 1, and FIG. 7 is a cross-sectional view of the port P2 side. In FIG. 6, the pressure control valve 16 includes a lower pressure adjusting unit 70 and an upper pressure setting unit 72. The pressure adjustment unit 70 is provided with an input port P1, a pressure detection port P3, and an output port P2 shown in FIG.

  The input port P1 communicates with the spool valve 76, and the spool valve 76 forms a valve seat 78 on the body side corresponding to the intermediate bowl-shaped valve body portion. Therefore, the pressure water flowing in from the input port P1 flows around the spool valve 76 and flows to the output port P2 shown in FIG. In response to the flow of pressure water from the input port P1 to the output port P2, secondary pressure water is introduced into the pressure detection port P3, and based on the differential pressure from the load applied to the diaphragm valve 74 by the upper pressure setting unit 72. The spool valve 76 is controlled to open and close, and the pressure of the output port P2 with respect to the automatic valve 10 is adjusted so that the secondary pressure becomes a set pressure determined by the spring 80.

  In this pressure adjusting operation, when the pressure applied to the diaphragm valve 74 exceeds the set pressure by the spring 80, the diaphragm valve 74 is deformed upward to lift the spool valve 76, and the input port P1 and the output port P2 (see FIG. 7). And the supply of pressure water to the open pressure side cylinder chamber 34a of the automatic valve 10 is cut off, whereby the main valve 30 is operated in the closing direction by the force of the spring 60 (see FIG. 2).

  On the contrary, when the pressure applied to the diaphragm valve 74 falls below the set pressure by the spring 80, the diaphragm valve 74 is deformed downward to push down the spool valve 76, and between the input port P1 and the output port P2 (see FIG. 7). In communication, pressure water is supplied to the open pressure side cylinder chamber 34a of the automatic valve 10 to operate in the opening direction of the main valve 30. As a result, the automatic valve 10 is controlled so as to keep the secondary pressure at the set pressure.

  In the initial state of FIG. 6, the spring 80 is in a low pressure setting state due to the spring force determined by the distance between the upper portion of the diaphragm valve 74 and the slider 82 positioned by inserting the pin 84 into the guide slit 86.

  A cylinder 90 is provided in the pressure setting unit 72 provided on the upper part of the pressure regulating valve 16, and a piston 88 is slidably provided in the cylinder 90. A plunger 94 is provided below the piston 88 via a frame 95, and the tip of the plunger 94 is disposed opposite to the lower slider 82 via a spring 85.

  The cylinder chamber 90a of the cylinder 90 is communicated with a port P4, and secondary side pressure water is introduced therein. The piston 88 is provided with a check valve 96 so that when pressure water is initially introduced into the port P4, water flows from the upper cylinder chamber 90a to the lower cylinder chamber 90b to be filled. On the other hand, the check valve 96 prevents the flow of water from the lower side to the upper side against the downward movement of the piston 88 when the secondary pressure is applied to the port P4 in a state where the water is filled.

  Ports P5 and P6 are provided for each of the cylinder chambers 90a and 90b of the cylinder 90, and a pipe L9 is connected between the ports P5 and P6. A needle 18 capable of adjusting the flow rate is provided in the middle of the pipe L9.

  For this reason, the moving speed of the piston 88 when the secondary pressure water is introduced into the port P4 is determined by the set flow rate of the needle 18 for flowing water from the cylinder chamber 90b to the cylinder chamber 90a. When the plunger 94 is inserted into and contacted with the slider 82 and presses the spring 80, a delay time until switching from the set low pressure to the set specified pressure is determined.

Next, the water discharge control in the embodiment of FIG. 1 will be described. In the normal monitoring state of FIG. 1, the main valve 30 of the automatic valve 10 is closed, and the closed pressurizing side cylinder chamber 34b above the main piston 32, the periphery of the stem 40, the ports S1, S2 and the cylinder port C2 are connected. The connected pipes L4, L5, L6, L7 and the pipe L8 are filled with water from the water storage tank 52.
Of course, the start valve 12 is in a closed state.

  When water is discharged due to the occurrence of a tunnel fire, the start valve 12 is operated and opened by remote control or the like. When the start valve 12 is opened, the primary side fire-extinguishing water is supplied from the primary pressure outlet 42 through the pipes L1 and L2 to the input port P1 of the pressure regulating valve 16, and from the output port P2 through the pipe L3 to the automatic valve 10. To the open pressure side cylinder chamber 34a.

  Therefore, the main piston 32 moves upward, and the main valve 28 starts to open as shown in FIG. As the main valve 28 is opened, the stem 40 also moves upward. However, when the stem 40 abuts against the spool valve seat 64 (see FIG. 2), the flow path is shut off, and the liquid cannot flow out from the cylinder port C2. The piston 32 stops and maintains the main valve 30 at a predetermined initial opening.

  When the main valve 30 is opened to the initial opening and pressurized fire-extinguishing water is supplied from the primary side to the secondary side, pressure is generated on the secondary side as water is discharged from the head. The pressure generated on the secondary side is applied to the initial water discharge pressure control valve 15 from the secondary pressure outlet 44 via the pipe L8, and operates from the closed position indicated by the arrow 15a to the open position indicated by the broken arrow 15b. In FIG. 5A, the spool valve 108 moves upward against the spring 118 by the force of the diaphragm 104, and the input port I1 and the output port I2 communicate with each other.

  For this reason, a circulation path that flows from the cylinder port C2 to the pipe L8 through the initial water discharge pressure control valve 15 is formed, and the stop state of the main piston 32 in the automatic valve 10 is released, and the valve can be opened and closed.

  Further, the pressure generated on the secondary side is also supplied to the pressure detection port P3 of the pressure regulating valve 16. At this time, the pressure regulating valve 16 is in the low pressure setting state as shown in FIGS. 5 and 6, and the discharge pressure is set. The supply pressure from the output port P2 to the automatic valve 10 is forced so as to keep the pressure low, and the water discharge pressure at the set low pressure is maintained.

  The pressure generated on the secondary side due to the initial opening of the automatic valve 10 is also applied to the port P4 of the pressure regulating valve 16. When the secondary pressure is applied to the port P4, the piston 88 provided in the pressure adjusting unit 70 in FIG. 6 starts to descend at a speed determined by the flow rate of the needle 18. After a predetermined delay time, the piston 88 moves the plunger 94 to a position where the slider 82 supporting the upper part of the spring 80 is pressed, as shown in FIG. Then switch from the low pressure setting to the specified pressure setting. Specifically, when the piston 88 strokes to a position where the piston 88 contacts the lower end of the stopper 92, the setting is switched to a predetermined specified pressure at that time.

  In this way, when the pressure adjustment valve 16 is switched from the low pressure setting to the specified pressure setting, the supply pressure to the open pressurizing side cylinder chamber 34a of the main piston 32 is adjusted so as to maintain the set specified pressure, and thereby, the full-scale by the specified pressure setting is adjusted. Water will be discharged.

  To stop the water discharge, the start valve 12 may be closed in a non-operating state. If the supply of the primary pressure water to the pressure regulating valve 16 is cut off by closing the start valve 12, the pressure of the output port P2 is also lost, the pressure of the open pressure side cylinder chamber 34a of the automatic valve 10 is also lost, and the main valve 30 is The spring 60 and the secondary pressure acting on the upper portion of the main piston 32 return to the closed position. The outflow of water that determines the movement of the main piston 32 when the main valve 28 returns to the closed state is gently performed by the delay operation by the pressure adjusting valve 16 and the flow path returning from the output port P2 to the pressure detection port P3.

  FIG. 10 is a cross-sectional view of another embodiment of the initial water discharge pressure control valve 15 of FIG. 1 that functions as a pressure responsive control valve of the present invention. In FIG. 10, the initial water discharge pressure control valve 15 of this embodiment has a cover 202 attached to an upper part of a valve body 200 with a diaphragm 204 interposed therebetween.

  A valve chamber 208 is formed in the valve body 200, and a valve body 210 is slidably incorporated therein. An upper portion of the valve body 210 is positioned outside the diaphragm 204 through the diaphragm chamber 206, and the diaphragm 204 is disposed by the retainer 211. It is fixed to. The valve body 200 is provided with an input port I1, an output port I2, and a pressure detection port I3. The input port I1 opens to the valve chamber 208, and the output port I2 opens to the communication hole from the valve seat 211.

  In the cover 202, a spring 212 is incorporated with one end abutting on the retainer 211 on the diaphragm 204 side and the other end abutting on the retainer 215. The retainer 215 is supported in contact with the tip of the set pressure adjusting screw 214 at the top of the cover 202.

  For this reason, the spring 212 applies a spring load generated at the position of the retainer 215 determined by the set pressure adjusting screw 214 to the valve body 210, thereby determining a set pressure for the initial water discharge pressure control valve 15 to open.

  Below the valve body 200, a fail-safe piston 216 is incorporated coaxially with the valve body 210 via a spring 220 so as to be slidable, with respect to the fail-safe cylinder chamber 218 below the fail-safe piston 216. The fail safe pipe L11 from the port I4 provided in the cover 202 is connected by the port I5. It should be noted that the side on which the spring 220 of the fail safe piston 216 is incorporated communicates with the outside through the communication hole 222.

  Further, a small hole 203 is formed in the cover 202, and the pressure water leaked due to the breakage of the diaphragm 204 is allowed to flow out of the small hole 203 so that the breakage of the diaphragm 304 can be confirmed from the outside.

  When the initial water discharge pressure control valve 15 shown in FIG. 10 is incorporated in the automatic valve device shown in FIG. 1, a pipe L7 from the secondary side of the automatic valve 10 is connected to the output port I2 and the pressure detection port I3. A pipe L4 to the port S1 of the automatic valve 10 is connected to the port I1.

  FIG. 11 is an explanatory diagram of the initial water discharge pressure control valve 15 of FIG. In FIG. 11, when the secondary pressure applied to the pressure detection port I3 of the initial water discharge pressure control valve 15 rises and exceeds the set pressure determined by the spring 212, the diaphragm 204 is shown against the spring 212 as shown in the figure. The valve body 210 is separated from the valve seat 211, so that the input port I1 and the output port I2 communicate with each other.

  FIG. 12 is a cross-sectional view of the initial water discharge pressure control valve 15 of FIG. 10 showing the fail-safe operation when the diaphragm 204 is damaged. In FIG. 12, if the diaphragm 204 is damaged at the A portion, the secondary side pressure applied to the pressure detection port I3 is received, and the pressure water flows into the cover 202 from the A portion which is the damaged portion of the diaphragm 204. It flows into the lower fail-safe cylinder chamber 216 through I4, fail-safe piping L11, and port I5.

  For this reason, the fail safe piston 216 moves upward while pushing the valve body 210, and the valve body 210 opens when the valve body 210 is separated from the valve seat 211, so that the input port I1 and the output port I2 communicate with each other to be in an open state.

  For this reason, even if the diaphragm 204 is damaged, if the secondary pressure applied to the pressure detection port I3 exceeds the set pressure, the fail-safe piston 216 is moved by the introduction of the secondary-side pressure water into the fail-safe cylinder chamber 218, and the valve body 210 is forcibly opened, and the initial water discharge pressure control valve 15 can be normally opened regardless of the damage of the diaphragm 204.

  Further, when the diaphragm 204 is damaged, the pressure water flows out from the small hole 203 provided in the cover 202, whereby the damage to the diaphragm 204 can be easily known.

  FIG. 13 is a cross-sectional view of another embodiment of the initial water discharge pressure control valve 15 of FIG. 1 that functions as a pressure responsive control valve of the present invention. In FIG. 13, the initial water discharge pressure control valve 15 of this embodiment has a cover 302 attached to the upper part of a valve body 300 with a diaphragm 304 interposed therebetween.

  A spool valve 308 is slidably incorporated in the valve body 300, and an upper portion of the spool valve 308 is positioned outside the diaphragm 304 via a diaphragm chamber 306 and is fixed to the diaphragm 304 by a retainer 311. A small hole 303 is formed in the cover 302, and pressure water leaked due to the breakage of the diaphragm 304 is ejected from the small hole 303 so that the breakage of the diaphragm 304 can be confirmed from the outside.

  A valve seat 305 is formed in the spool hole through which the spool valve 308 slides, and opens and closes between the valve chamber 307 and the diaphragm chamber 306. The valve body 300 is provided with an output port I2 that also serves as an input port I1 and a pressure detection port.

  The input port I1 opens to the valve chamber 307, and the output port I2 communicates with the diaphragm chamber 306.

  A spring 312 having one end abutting on the diaphragm 311 on the diaphragm 304 side and the other end abutting on the retainer 315 is incorporated in the cover 302. The retainer 315 is supported in contact with the tip of the set pressure adjusting screw 314 at the top of the cover 302.

  For this reason, the spring 312 determines a set pressure for the initial water discharge pressure control valve 15 to open by applying a spring load generated at the position of the retainer 315 determined by the set pressure adjusting screw 314 to the spool valve 308.

  A fail safe piston 316 is slidably incorporated on the lower side of the valve body 300 coaxially with the spool 308, and with respect to the fail safe cylinder chamber 318 closed by a plug 320 below the fail safe piston 316. The lower end of the communication hole 310 that penetrates the spool valve 308 in the inner axial direction is open to communicate with the inside of the cover 302 behind the upper diaphragm 304. Note that an air communication hole 322 is opened in the upper space of the fail safe piston 316.

  When the initial water discharge pressure control valve 15 of FIG. 13 is incorporated in the automatic valve device of FIG. 1, a pipe L7 from the secondary side of the automatic valve 10 is connected to the output port I2, and the automatic valve is connected to the input port I1. The pipe L4 for 10 ports S1 is connected.

  FIG. 14 is an explanatory diagram of the initial water discharge pressure control valve 15 of FIG. 13 that has been opened by generation of the secondary water discharge pressure. In FIG. 14, when the secondary pressure applied to the output port I 2 functioning as the pressure detection port of the initial water discharge pressure control valve 15 rises and exceeds the set pressure determined by the spring 312, the diaphragm is resisted against the spring 312. 304 is deformed upward as shown, and the spool valve 308 is lifted and the valve seat 305 is opened, so that the input port I1 and the output port I2 communicate with each other.

  If the diaphragm 304 is damaged, the secondary side pressure applied to the output port I2 functioning as a pressure detection port is received, so that the pressure water flows into the cover 302 from the damaged portion of the diaphragm 304, and the inside of the spool valve 308 Through the communication hole 310, pressurized water flows into the lower fail-safe cylinder chamber 316.

  Therefore, the fail-safe piston 316 moves upward while pushing the spool valve 308, and the spool valve 308 opens when the spool valve 308 moves away from the valve seat 305, and the input port I1 and the output port I2 communicate with each other to be in the open state.

  For this reason, even if the diaphragm 304 is damaged, if the secondary side pressure applied to the output port I2 that functions as a pressure detection port exceeds the set pressure, the fail-safe piston 316 is introduced by the introduction of the secondary-side pressure water into the fail-safe cylinder chamber 318. The spool valve 308 is forced to open and the initial water discharge pressure control valve 15 can be normally opened regardless of the damage of the diaphragm 304.

  Further, the pressure water leaked into the cover 302 due to the breakage of the diaphragm 304 flows out from the small hole 303, and thus the diaphragm 304 can be broken from the outside.

  The automatic valve 10 in the above embodiment is stopped by shutting off the flow of liquid from the cylinder chamber on the liquid discharge side by the main piston with the movement of the piston during the stop operation when opened to the initial opening. Although it is a structure, when stopping the movement of the piston in this way, liquid flow control is not performed when the flow path of the liquid from the cylinder chamber on the discharge side is blocked rather than the flow of liquid into the cylinder chamber on the pressure side It is excellent in terms of high degree and stability as a valve.

The present invention is not limited to the above-described embodiments, and includes appropriate modifications that do not impair the objects and advantages thereof.

Explanatory drawing of the automatic valve device to which the present invention is applied Cross section of the automatic valve of FIG. Time chart of water discharge pressure controlled by the automatic valve device of FIG. 1 is a cross-sectional view of the initial water discharge pressure control valve of FIG. 1 that functions as a pressure responsive control valve of the present invention. Sectional view of the initial water discharge pressure control valve of FIG. Sectional view of the pressure regulating valve of FIG. Sectional drawing of the cylinder port part in the pressure regulating valve of FIG. Sectional view when the pressure regulating valve in FIG. Explanatory drawing of the automatic valve apparatus which operate | moved to the initial water discharge state by operation | movement of the starting valve in embodiment of FIG. Sectional drawing of other embodiment of the initial water discharge pressure control valve of FIG. 1 which functions as a pressure response type control valve of this invention Sectional view of the initial water discharge pressure control valve of FIG. 10 opened by the generation of the secondary water discharge pressure Sectional view of the initial water discharge pressure control valve of FIG. 10 showing the fail-safe operation when the diaphragm is broken Sectional drawing of other embodiment of the initial water discharge pressure control valve of FIG. 1 which functions as a pressure response type control valve of this invention Sectional view of the initial water discharge pressure control valve of FIG. 10 opened by the generation of the secondary water discharge pressure

Explanation of symbols

10: Automatic valve 12: Start valve 14: Manual start valve 15: Initial water discharge pressure control valve 16: Pressure regulating valve 18: Needle 20: Valve body 22: Inlet 24: Outlet 26: Partition wall 28: Valve seat 30: Main valve 32: Main piston 32a: Sleeve 34: Main cylinder 34a: Open pressure side cylinder chamber 34b: Closed pressure side cylinder chamber 36: Drive shaft 38: Cylinder cylinder 40: Stem 42: Primary pressure outlet 44: Secondary pressure Outlet 46: Pressure switch 48: Automatic drain valve 50: Test water discharge valve 52: Water storage tank 54: Water supply valve 55: Valve hole 56: Valve seal 60, 118, 212, 220, 312: Spring 62, 102, 202, 302 : Cover 64: Spool valve seat 66: Seal 70: Pressure adjusting part 72: Pressure setting part 74: Diaphragm valve 75: Cylinder pressure introduction chamber 76, 308: Spool valve 77: Exit chamber 82: Slider 84: Pin 86: Guide slit 88: Piston 90: Cylinder 90a: Primary cylinder chamber 90b: Secondary cylinder chamber 92: Stopper 94: Plunger 95: Frame 96: Check valves 100a, 110b, 200: Valve bodies 104, 204, 302: Diaphragms 106, 206, 306: Diaphragm chambers 108, 308: Spool valves 109, 211, 305: Valve seats 110, 132, 310: Communication holes 111: Seals 112, 114, 128, 130: Presser fittings 114, 122, 211, 215, 311, 315: Retainer 116: Nut 120, 214, 314: Set pressure adjusting screw 124: Fail safe diaphragm 126: Fail safe diaphragm chamber 132, 310: Communication hole 208, 307: Valve Chamber 210: Valve body 216 316: failsafe piston 218, 318: Fail-safe cylinder chamber

Claims (5)

A diaphragm provided in a diaphragm chamber into which pressure water is introduced from a pressure detection port;
A spring for applying a set load corresponding to a predetermined set pressure to the diaphragm;
When the introduction pressure applied to the diaphragm, which is fixed to the diaphragm and applied to the diaphragm, is equal to or lower than the set pressure, it is in the closed position, and when it exceeds the set pressure, the input port is moved to the open position by displacement against the diaphragm spring. And a valve member communicating with the output port, a pressure responsive control valve,
A pressure-responsive control valve comprising a fail-safe mechanism for moving the valve member to an open position using pressure water flowing out through the damaged portion when the diaphragm is damaged.
The pressure-responsive control valve according to claim 1, wherein the fail-safe mechanism is
A fail-safe diaphragm fixed to an end of the valve member, which is provided in a fail-safe diaphragm chamber arranged in tandem with respect to the diaphragm chamber, and moves the valve member to an open position by pressure water flowing out due to breakage of the diaphragm; ,
A communication hole formed in the internal axial direction of the valve member that communicates the spring contact side of the diaphragm with the fail-safe diaphragm chamber;
A pressure responsive control valve comprising:
The pressure-responsive control valve according to claim 1, wherein the fail-safe mechanism is
A fail-safe piston provided in a fail-safe cylinder chamber arranged in tandem with respect to the diaphragm chamber, and moving the valve member to an open position by pressure water flowing out due to breakage of the diaphragm;
Fail-safe piping connecting a spring contact side of the diaphragm to the fail-safe cylinder chamber;
A pressure responsive control valve comprising:
The pressure-responsive control valve according to claim 1, wherein the fail-safe mechanism is
A fail-safe piston provided in a fail-safe cylinder chamber arranged in tandem with respect to the diaphragm chamber, and moving the valve member to an open position by pressure water flowing out due to breakage of the diaphragm;
A communication hole formed in the internal axial direction of the valve member that communicates the spring contact side of the diaphragm with the fail-safe diaphragm chamber;
A pressure responsive control valve comprising:
  2. The pressure responsive control valve according to claim 1, wherein a small hole for leaking pressure water that has flowed out due to breakage of the diaphragm is provided in a cover attached to a spring contact side of the diaphragm. Response type control valve.

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