JP3040738B2 - Emergency valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency operation valve device installed in a pipeline connecting an emergency water storage tank and a water main used in an earthquake disaster or the like.

[0002]

2. Description of the Related Art Conventionally, emergency water tanks (tanks) are provided in roads, schoolyards or underground parks, for example, in order to secure living water for local residents in the event of a disaster such as an earthquake or to provide water for fire extinguishing. It is buried.

[0003] This emergency water storage tank equipment is generally constructed as shown in FIG.
As shown in (1), a bypass pipe P is provided in the water main pipe S, a water storage tank (tank) T is interposed in the bypass pipe P, and emergency shutoff valves 1, 1 are provided on the outflow / inflow side of the bypass pipe P, respectively. In addition, an emergency opening valve 2 is provided in the water main pipe S between the bypass pipes P. In the figure, 3 is a fire hydrant, 4 is a manual pump, and 5 is an air valve.

In normal times, the emergency shutoff valves 1 and 1 are opened (see FIG. 9A), and the emergency release valve 2 is closed (FIG. 10).
(See (a)), water is flowed in the directions of arrows a, b, c, and d to store water in the water storage tank T and prevent stagnation of water in the water storage tank T to prevent rot. . On the other hand, in an emergency such as an earthquake (emergency or abnormal), the emergency shutoff valves 1 and 1 are closed (see FIG. 9B) and the emergency release valve 2 is opened (see FIG. 10B). In addition to ensuring the flow of the water main S, the water storage tank T is cut off from the water main S to prevent the water from flowing out of the water storage tank T due to the siphon phenomenon, and secure the water.

In this emergency water storage tank facility, various techniques for controlling the emergency shutoff valve 1 and the emergency release valve 2 by the water pressure of the water main pipe S have been developed. When the state returns to the normal state, the valves 1 and 2 are automatically reset, and when the state returns to the normal state from the emergency state, the valve maintains the emergency state. As the former automatic return type, for example, registered utility model No. 301833
No. 5 discloses an example thereof, and as a similar prior art, as shown in FIG. 12, an emergency shutoff valve 1 and an emergency release valve 2 are provided with two pilot valves 6 and 7. . On the other hand, as a self-holding type, for example,
No. 21275.

The prior art shown in FIG. 12 describes, for example, the case of an emergency shutoff valve 1. Two emergency return and shutoff pilot valves 6 and 7 are attached to the emergency shutoff valve 1 interposed in a bypass pipe P. The pilot valves 6 and 7 include diaphragms 6a and 7a, springs 6b and 7b for pressing the diaphragm, valve bodies 6c and 7c interlocking with the diaphragm via a valve rod, and valve seats 6d and 7d, respectively. In normal times when the water pressure is higher than the required pressure,
As shown in FIG. 2 (a), the tap water pressure is applied to the pilot valves 6, 7 via the pilot pipe t, the diaphragms 6a, 7a compress the springs 6b, 7b, and the valve body 6c connects the valve seat 6d. The valve body 7c comes into pressure contact with the valve seat 7d and the water pressure is not applied to the cylinder valve 8a of the emergency shut-off valve 1 as soon as it comes away from the valve. Therefore, the cylinder valve 8a has an internal and external pressure of P ₁ >
P ₂ becomes away from the valve seat 9a, shut-off valve 1 is in the open state.

On the other hand, when the water pressure drops due to an earthquake or the like and becomes lower than the urging force of the springs 6b, 7b, as shown in FIG. 1B, the pilot valves 6, 7 are attached to the springs 6b, 7b. Due to the force, the valve element 6c contacts the valve seat 6d, the valve element 7c separates from the valve seat 7d, and the water pressure is applied to the cylinder 8 (P ₁ ≒ P ₂ ). In this case, the diameter D ₂ of the emergency shut-off valve 1 of the valve seat diameter D ₁ and the cylinder 11 D ₁ <
There is a relationship of _{D 2, π / 4 · D} 1 2 · P 1 <π / 4 · D 2 2
Since P ₂ + W (the weight of the cylinder valve 8a), the cylinder valve 8a comes into contact with the valve seat 9a to close the pipe P.

When the water pressure of the water main pipe S rises and returns to a required value while the pipe P is closed, the water pressure is applied to the diaphragm 7a and returns to the state shown in FIG. I do. That is, automatic return is performed.

As shown in FIG. 13, a self-holding valve has a bypass pipe P connected to one of two ports and a water main pipe S connected to the other two ports. And water is circulated as indicated by arrows a, b, c, and d. In an emergency, the valve body f is positioned as indicated by a solid line by a weight to cut off the bypass pipe P and the water main pipe S. The return is performed manually.

[0010]

The above-mentioned emergency shut-off valve 1,
Conventional emergency operation valve devices including the emergency release valve 2 and the like have only an automatic return type and a self-holding type, that is, the former automatically returns to a normal state when the pipe pressure returns, and the latter returns to a normal state. Even if the pressure in the tube returns, it must be restored manually.

For this reason, when installing this valve device, it is necessary to determine in advance which of the two should be adopted. If the installation specifications are determined slowly, and if the production and installation are performed in a complete manner, Subsequent remodeling and remanufacturing are inevitable if changes are made after or after installation.

SUMMARY OF THE INVENTION In view of the above circumstances, it is a first object of the present invention to provide a self-retaining emergency operating valve device having a self-holding function, and selectively exhibit both self-holding and automatic returning functions. The second task is to be able to do this.

[0013]

SUMMARY OF THE INVENTION In order to achieve the first object, the present invention provides a pilot pipe which is always operable to flow, and which opens and closes an emergency operation valve by the valve element driving part in the event of an abnormality. When the operation was completed, it was shut off. In this way, even if it is an automatic return type, it will be a self-holding type. If the shutoff function is removed, the original automatic return type is obtained.

[0014] In order to achieve the second object, it is possible to select between the operation of interrupting the pilot tube at the time of the abnormality and the operation of not interrupting the operation. If you do this,
Depending on the selection, it becomes an automatic return type or a self-holding type.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment for achieving the first object, an operating rod which moves integrally with a valve shaft is provided on an outer surface of a valve box of the emergency operation valve, and the operating rod is attached to the pilot pipe. The interposed on-off valve is connected by a link mechanism, and in the case of the abnormality, the operation rod is moved based on the movement of the valve body to close the on-off valve via the link mechanism and shut off the pilot pipe. Can be.

In this configuration, a bypass pipe is provided in the opening / closing valve, and a selective opening / closing valve is interposed in the bypass pipe, and the selective opening / closing valve does not shut off the pilot pipe at the time of the abnormality and does not shut off the pilot pipe. If the operation can be selected, the second problem can be achieved. The selective on-off valve may be a manual type or a motorized return type that can be remotely operated from the management room.

In the link mechanism, the pin connecting portion may be formed by connecting a pin and a long hole, and the on-off valve may be operated after the pin reaches the end of the long hole. With this configuration, the on-off valve does not have the opening / closing action (valve rotating action) while the pin moves in the elongated hole. For this reason, even if the valve body of the emergency operation valve shifts due to an earthquake or the like and the operation rod moves,
If the movement is within the movement range of the elongated hole of the pin, the on-off valve is not affected by the movement, and the reliability of the self-holding function is high.

Further, as an embodiment in which the emergency operation valve device is employed in the above-mentioned emergency water storage tank facility, the emergency operation valve has the following configuration (A), and the valve body driving section has the following configuration (B). The pilot valve has the following configuration (C), the valve shaft of the emergency operation valve is penetrated through the cylinder of the valve drive unit, the protruding end is the operating rod, and the first chamber and the first chamber of the emergency operation valve A bypass pipe of the emergency water storage tank equipment is connected to four chambers, a water main pipe is connected to the second chamber and the third chamber, and a first port of the pilot valve is connected to the emergency operation valve via a pilot pipe. A second port of the pilot valve is connected to a side of the valve body driving portion which opposes the biasing force of the spring of the piston via a pilot pipe. During normal times exceeding the set value, As a result, the piston of the valve drive unit moves against the spring, the valve shaft of the emergency operation valve moves, and the valve body moves away from the first and third valve seats of the emergency operation valve, and the second valve operates. In the emergency, when the valve body abuts against the valve seat and the water pressure is low, the following springs allow the valve body to abut against the first and third valve seats and separate the valve body from the second valve seat. Can be adopted.

(A) "A valve rod that slides on the same axis is provided in a valve box, and partition walls crossing the valve rod are provided at three axial positions of the valve rod. The first, second, third, and fourth chambers are sequentially divided in four directions, ports are formed in the respective chambers, and communication holes through which the valve stem penetrates are formed in the partition walls. A first valve seat is provided around the communication hole between the first and second chambers, a second valve seat is provided around the communication hole between the second and third chambers, and a third valve seat is provided around the communication hole between the third and fourth chambers. A valve seat is provided, and the valve rod is provided with a valve body that opens and closes the communication hole by coming into contact with and separating from the valve seat. When each valve body comes into contact with the first and third valve seats, A four-way switching valve that separates from the second valve seat and separates from the first and third valve seats when coming into contact with the second valve seat. " The valve stem is inserted And a piston interlocking with the valve rod is provided in the cylinder, and the piston is moved away from the second valve seat so that the valve body comes into contact with the first and third valve seats. (C) “A first and second port flow path in a valve box having first, second, and third three ports is provided. And a second valve seat is formed in the flow path between the second and third ports, and both valve seats are positioned on the same axis, and a valve stem is provided on the axis. A valve body which alternately comes into contact with and separates from the two valve seats, a cylinder in which the valve rod is inserted is mounted on the valve box, and a diaphragm interlocked with the valve rod is provided in the cylinder, and the diaphragm is provided. The second of the emergency operation valve
A spring that applies pilot pressure from the port and biases the diaphragm in a direction opposite to the pilot pressure is provided, and when the pilot pressure exceeds a set value, the pilot pressure causes the valve stem to pass through the diaphragm. A pressure sensing pilot valve that moves in the axial direction to separate the valve body from the first valve seat and abut on the second valve seat. In the emergency operation valve in this embodiment, the valve body comes into contact with the first and third valve seats and the valve body separates from the second valve seat due to the axial movement of the valve rod, and the first and fourth valve seats move. When the chamber is closed and the second and third chambers communicate with each other, the valve body separates from the first and third valve seats, the valve body abuts on the second valve seat, and the first chamber, the second chamber, and the second chamber. The three chambers and the fourth chamber are switched to each other in a state where they communicate with each other.

Further, the pressure sensing pilot valve adjusts the pilot pressure at which the valve body comes into contact with or separates from the valve seat by adjusting the biasing force of the spring. This adjustment pressure is a switching pressure for opening and closing the flow path between the first port and the second port and for opening and closing the flow path between the second port and the third port. That is, by adjusting the urging force of the spring, the two channels can be simultaneously opened and closed. For this reason, if the two flow paths are the open / close flow paths of the return and shut-off pilot valves 6, 7, the action of both valves can be performed by one valve.

In this embodiment, the water pressure of the water main pipe is appropriately applied to the cylinder of the valve drive unit by the above action by the pilot valve, and the emergency operation valve is connected to the valve via the piston. The wand moves automatically and the above two alternatives are alternated to provide normal or emergency action. At this time, if the shut-off function of the pilot tube is not removed, it is held in an emergency in a self-holding manner (for details of the operation of this embodiment, see an example described later).

[0022]

Embodiment 1 One embodiment is shown in FIGS. 1 to 7, and in each of the drawings, reference numeral 10 denotes a valve box of an emergency operation valve (four-way switching valve) V, which is connected to a first port (port) 11a. 2nd port (mouth)
11a, the other divided body 10b having the third port (port) 11c and the fourth port (mouth) 11d, and the lid 10c of the one divided body 10a. And 10b, one of the divided bodies 10a and the lid 10c are integrated by a bolt 13 with a packing (seal) 12 interposed therebetween. Bolts 13 are provided at appropriate positions around the periphery.

A valve rod 14 is inserted into the center of the valve box 10.
The valve stem 14 is supported movably in the axial direction by bearings 15a and 15b on the bottom surface of the lid 10c and the other divided body 10b. In the valve box 10, partition walls 16a, 16b, 16c are provided to cross the valve rod 14, and the first chamber 17a of the first port 11a, the second chamber 17b of the second port 11b, and the third chamber 11b of the third port 11c are provided. It is divided into four chambers of a third chamber 17c and a fourth chamber 17d of a fourth port 11d.

The partition walls 16a, 16b, 16c are formed with communication holes 18a, 18b, 18c through which the valve rod 14 penetrates, and the peripheral edges of the holes 18a, 18b, 18c are first, second, and third valves. The seats are 19a, 19b, and 19c. The valve stem 14 is provided with valve bodies 20a and 20b which are in contact with and separated from the valve seats 19a, 19b and 19c. As shown in FIG. 6, the lower valve body 20b comes into contact with the second valve seat 19b. The upper valve body 20a is separated from the first valve seat 19a, and as shown in FIG.
The upper valve body 20a comes into contact with the first valve seat 19a when coming into contact with the third valve seat 19c apart from the first valve seat 9b. Valve seats 19a, 19b, 19c of the valve bodies 20a, 20b
A seal 21 is provided on the contact surface with the seal to ensure watertightness.

A valve body driving section D is provided above the lid 10c of the valve box 10.
Is configured. The configuration is such that the upper part of the lid 10c is cylindrical, and the cylinder with the lid is screwed into the cylindrical part to form the cylinder 22. The upper end of the valve rod 14 is inserted into the cylinder 22, The piston 23 is firmly fixed. This piston 23 is pushed downward by a spring 24. On the opposite side of the spring 24 of the cylinder 22, the second chamber 11 is connected via a pilot valve 30 and a pilot pipe 26.
The pilot pipe 25 communicating with b is connected.

The pilot valve 30 is a three-way valve having a first port (port) 31a, a second port (port) 31b, and a third port (port) 31c. The cylinder 33 is provided.
The first port 31a is connected to the pilot pipe 26, the second port 31b is connected to the pilot pipe 25, and the third port 31c is openable to the outside air via a valve 25a. The valve 25a is always open. In the cylinder 33, a diaphragm 34 such as Velofram (trade name of Fujikura Rubber Co., Ltd.) is stretched and divided into two upper and lower chambers. A valve rod 35 protruding into the cylinder 33 from the valve box 31 is integrated with the diaphragm 34, and a valve body (piston) 36 moves up and down in accordance with the deflection of the diaphragm 34, and is selectively provided to the valve seats 36 a and 36 b. Approaching and leaving.

The lower end of the spring 32 in the cylinder 33 is in contact with the diaphragm 34 and the other end thereof is in contact with (received by) the spring receiver 37. The spring receiver 37 moves in the cylinder 33 according to the screwing amount of the bolt 38 to expand and contract the spring 32. Therefore, the urging force of the spring 32 is adjusted by the screwing amount of the bolt 38, and the movement of the valve stem 35, that is, the pressure applied to the diaphragm 34 in which the valve body 36 comes into contact with and separates from the valve seats 36a and 36b can be adjusted. . The application is performed through a pilot port 39 via a pilot pipe 27 branched from the pilot pipe 26.

When a pilot pressure such as tap water pressure is applied to the diaphragm 34 to the pilot valve 30 and the pressure is higher than the pressure set by the spring 32, as shown in FIG. Diaphragm 3
4 is bent upward, the valve stem 35 is also raised, and the valve body 36
The first port 31a and the second port 3 are pressed against the valve seat 36b.
1b is opened, the second port 31b and the third port 3
The flow path 1c is closed.

In this state, if for some reason such as an earthquake, for example, the water pressure of the water main S drops and the pilot pressure drops, and the pilot pressure drops below the set pressure by the spring 32,
As shown in FIG. 7, the diaphragm 34 is bent downward by the spring 32, the valve rod 35 is also lowered, and the valve body 36 is moved to the second valve seat 3.
6b, presses against the first valve seat 36a, closes the flow path between the first and second ports, and opens the flow path between the second and third ports. This opening opens the inside of the cylinder 22 of the valve body driving unit D to the outside air via the pilot pipe 25.

As shown in FIGS. 1 to 4, the valve rod 14 projects from the upper surface of the cylinder 22 of the emergency operation valve V to form an operating rod 40, and the pilot pipe 26 reaches to be fixed by a mounting plate 41. Have been. This mounting plate 4
Locking valve (open / close valve) for pilot pipe 26 along 1
The valve 42 has a lever 44 provided on the valve shaft thereof. An operation rod 43 is screwed into an upper end of the operation rod 40, and a pin 43 a of the operation rod 43 is fitted in a long hole 45 a of a link 45 connected to the lever 44. Therefore, the lever 44 pivots via the link 45 in accordance with the vertical movement of the operation rod 40, and the locking valve 42 is opened and closed. The opening and closing adjustment is performed by operating the operating rod 4 to the operating rod 40.
This is performed at the screw-in position of No. 3.

A bypass pipe 28 is provided alongside the locking valve 42, and a return on-off valve (selection on-off valve) 46 is interposed in the bypass pipe 28. When this valve 46 is opened,
Regardless of the opening and closing of the locking valve 42, the internal pressure of the second port 11b of the emergency operation valve V is applied to the pilot valve 30.

This embodiment has the above configuration. When used in the above-mentioned emergency water storage tank facility, the first and fourth ports 1
A bypass pipe P having a water storage tank T interposed between 1a and 11d, and a water main pipe S connected to the second and third ports 11b and 11c.

In this connection state, if the return on-off valve 46 is opened, an automatic return function is exhibited. That is,
In normal times, the water pressure in the water main S also has a predetermined value.
As shown in FIG. 5, the piston 23 compresses the spring 24 via the pilot valve 30 by the water pressure and moves upward (top dead center position), the valve rod 14 is also positioned upward, and the valve body 20b is moved to the second position.
While abutting on the valve seat 19b, the valve body 20a maintains a state separated from the first valve seat 19a. In this state, the first chamber 17a and the second chamber 17b communicate with each other, and the third chamber 17c and the fourth chamber 17d communicate with each other. The water in the water main S flows like a solid line or a chain line in FIG. Pass through.

On the other hand, in an emergency (at an abnormal time) when an earthquake or the like occurs, the water pressure in the water main S decreases. Due to this decrease in water pressure, as shown in FIG. 7, no water pressure is applied to the cylinder 22 via the pilot valve 30 at all, and the cylinder 22 is opened.
The piston 23 is moved downward by a spring 24 (bottom dead center position), and the valve rod 14 is also located below, so that the valve body 20b separates from the second valve seat 19b and abuts on the third valve seat 19c, 20a contacts the first valve seat 19a. In this state, the second chamber 17b communicates with the third chamber 17c, and the first and fourth chambers 17b and 17c communicate with each other.
The chambers 17a and 17d are shut off from the second and third chambers 17b and 17c, and the water in the water main S flows as shown by the solid line or the chain line in the figure, and the water in the water storage tank T may flow out. Absent.

In this closed state of the water storage tank T, when the water pressure of the water main pipe S rises and returns to a required value, the pilot valve 3
The hydraulic pressure is applied to the cylinder 22 through the valve 0, and the piston 23 is moved upward by the required hydraulic pressure to return to the state shown in FIG. That is, even if the water pressure in the water main S is temporarily reduced for some reason, the state automatically returns to the state of flowing water to the water storage tank T.

On the other hand, if the return on-off valve 46 is closed in the state of FIG. 6, the self-holding function is exhibited. That is, in normal times, the valve rod 14 is raised, and as shown in FIG. 5A, the operation rod 40 is also raised, and the locking valve 42 is in an open state. For this reason, the state of FIG. 6 is maintained, and the water in the water main S flows as indicated by a solid line or a chain line in FIG. 6 and passes through the water storage tank T.

In an emergency, as in the case of the automatic resetting function, the valve bodies 20a and 20b are moved by the springs 24 as shown in FIG.
a, 19b, the water in the water main S flows as indicated by a solid line or a chain line in FIG. At this time, as the valve stem 14 descends, the operating rod 40 also descends, and after the pin 43a moves from one end to the other end in the elongated hole 45a, as shown in FIGS. 5B and 5C, via the link 45 and the like. The locking valve 42 is closed.
By this closing, the pilot pipe 26 is cut off, and
Even if the water pressure of the water main S rises and returns to a required value, the water pressure is not applied to the cylinder 22. Therefore, the emergency operation valve V keeps the state of FIG. That is,
A self-holding function is exhibited.

In the self-holding function, even if the valve bodies 20a and 20b of the operating valve V move due to vibration force due to an earthquake, the operation rod 40 is moved up and down by the elongated hole 4 of the pin 43a.
It is absorbed by the movement in 5a, and the locking valve 42 is not affected. That is, the self-holding function state is maintained.

The self-holding function is released by opening the return opening / closing valve 46 in a state where it has returned to the normal state. That is, when the return on-off valve 46 is opened, the hydraulic pressure of the second port 11b of the emergency operation valve V is applied to the pilot valve 30 through the bypass pipe 28, and the piston 23 is raised as shown in FIG. The body 20a, 20b is the valve seat 19
a, away from 19b. At this time, the operation rod 40 rises as the valve rod 14 rises. However, as shown in FIG. 5D, the pin 43a initially moves in the elongated hole 45a and contacts the end thereof, and then the link 45 (A), the locking valve 42 shown in FIG.

In this embodiment, since the lower valve body 20b is large enough to pass through the first valve seat 19a (communication hole 18a) and the second valve seat 19b (communication hole 18b), when the lid 10c is removed. The valve stem 14, each valve element 20a, 20b, and the valve seat can be taken out from the valve box 10, and maintenance such as replacement of the seat is very simple.

[0041]

Embodiment 2 In this embodiment, as shown in FIG. 8, in the same emergency operation valve V as described above, the return pilot valve 7 and the shutoff pilot valve 6 shown in FIG. It is attached. In this embodiment, the valves 6 and 7 operate in the same manner as described above, and in normal times, the valve bodies 20a, 20b, 6c and 7c and the diaphragm 6 as shown by solid lines.
A and 7a are located and the same operation is performed.

That is, in normal times, the water pressure in the water main S also has a required value, and the pilot pressure is determined by the water pressure.
, The piston 23 compresses the spring 24 to move upward, the valve rod 14 is also positioned upward, the valve element 20b contacts the second valve seat 19b as shown by the solid line, and the valve element 20a is connected to the first valve. The state away from the seat 19a is maintained. This state is the first
Room 17a and second room 17b, third room 17c and fourth room 17d
The water in the water main S flows as indicated by the solid line or the chain line in FIG.

On the other hand, in the event of an emergency such as an earthquake, the water pressure in the water main S drops. Due to this decrease in water pressure, no water pressure is applied to the cylinder 22 via the pilot valves 6 and 7, the piston 23 is moved downward by the spring 24, and the valve rod 14 is also positioned below, so that the valve body 20 is positioned like a chain line.
b separates from the second valve seat 19b and abuts on the third valve seat 19c, and the valve element 20a abuts on the first valve seat 19a.
In this state, the second chamber 17b and the third chamber 17c communicate with each other, and the first and fourth chambers 17a and 17d are connected to the second and third chambers 17b and 17d.
c, the water in the water main S flows as shown by the solid line or the chain line in the figure, and the water in the water storage tank T does not flow out.

When the water pressure of the water main pipe S rises and returns to a required value in the closed state of the water storage tank T, the water pressure is applied to the cylinder 22 via the return pilot valve 7 and shut off. Cylinder 22 by the pilot valve 6
The flow of water from the inside is stopped, and the piston 23 is moved upward by the required water pressure to return to the state shown by the solid line.

During these operations, the locking valve 42 and the return on-off valve 46 are operated in the same manner as described above, so that the locking valve 4
A similar effect is achieved, for example, when the water pressure is not reapplied into the cylinder 22 in the emergency state via 2.

[0046]

Embodiment 3 In this embodiment, as shown in FIGS. 9 and 10, in the shut-off valve 1 (opening valve 2) shown in FIG. 12, an operating rod 40 is provided on the cylinder valve (valve element) 8a. The opening and closing operation is performed by a pilot valve 30. 9 shows the emergency shut-off valve 1 and FIG. 10 shows the emergency open valve 2, and each port 31a of each pilot pipe t.
Connections to 31b, 31c, and 39 are as shown in the figure, and each figure (a) is a normal state, and each figure (b) is an emergency.

In the case of the shut-off valve 1, the diaphragm 34 flexes upward by water pressure and presses the valve body 36 against the second valve seat 36b, as shown in FIG.
a is open, and the inside of the cylinder 8 is open to the outside. Therefore, from P ₁ > P ₂ , the cylinder valve 8a rises, the valve seat 9a is opened, the shutoff valve 1 is in an open state, and tap water is flowing through the pipeline P.

On the other hand, when the water pressure decreases due to an earthquake or the like and becomes equal to or lower than the set pressure by the spring 32, the diaphragm 34 bends downward by the spring 32, as shown in FIG. The first valve seat 36 is separated from the second valve seat 36b.
a. For this reason, the water pressure in the pipeline P is applied from the second port 31b into the cylinder 8, and the cylinder valve 8a descends and presses against the valve seat 9a to close the pipeline P in the same manner as described above.

When the water pressure in the pipe P returns and becomes equal to or higher than the set pressure, the diaphragm 34 bends upward and the pilot valve 3
0 returns to open the pipe P as shown in FIG.

In the case of the opening valve 2, the operation is reverse to that of the above-mentioned shut-off valve 1, and the diaphragm 3 is normally operated by the water pressure.
4 is bent upward to press the valve body 36 against the second valve seat 36b,
The first valve seat 36a is opened, water pressure is applied to the inside of the cylinder 8, the cylinder valve 8a descends and presses against the valve seat 9a to close the pipe S.

On the other hand, when the water pressure decreases due to an earthquake or the like and becomes lower than the set pressure by the spring 32, the diaphragm 34 is bent downward by the spring 32, as shown in FIG. The first valve seat 36 is separated from the second valve seat 36b.
a. For this reason, the water pressure in the pipe S is
The cylinder valve 8a rises and separates from the valve seat 9a to open the conduit S, without being applied to the inside.

When the water pressure in the pipe S returns and becomes equal to or higher than the set pressure, the diaphragm 34 bends upward and the pilot valve 3
0 returns as shown in FIG.

At the time of these operations, the locking valve 42 and the return on-off valve 46 perform the same operation by closing the cylinder 8 in the emergency state via the locking valve 42 by the same operation as described above.

In each embodiment, the locking valve 4
2. The mounting position of the return on-off valve 46 may be a position indicated by a chain line in each drawing. Further, the return on-off valve 46 does not necessarily need to be provided. In this case, the connection between the operation rod 40 and the locking valve 42 is disconnected by disconnecting the link 45 or the like, thereby returning from the self-holding state. Or automatic return type only.

Further, in the conventional example shown in FIG.
9 and 10, an operating rod 40 is provided on the cylinder valve 8a, and only a locking valve 42 which is moved by the operating rod 40 or a return opening / closing valve 46 is provided in the pilot pipe t as shown by a dashed line in FIG. Then, the operation and effect of the present invention can be obtained.

[0056]

As described above, the present invention is of an automatic return type having a self-holding function. If the installation location (pit) is determined, the production can be advanced even if the specification is not determined, and later. Therefore, even if there is a change between self-holding and automatic return, it can be easily handled.

If the self-holding function is a mechanical mechanism such as a link mechanism, the mechanism is simple, hardly breaks down, and it is easy to cope with any inconvenience. In addition, since there are no electric parts and no power supply is required, there is no problem even if a power failure occurs due to an earthquake, flood, or the like.

If a selective release valve is assembled, it can be easily adapted to any of the applications of self-holding or automatic return at the open or closed position, thereby facilitating production such as parting-off production. In addition, even if the usage method is changed after delivery, it can be handled only by opening and closing the selective opening valve.

If the link mechanism is connected through a long hole,
Even if the position of the main valve (emergency valve) changes due to vibration, earthquake, etc., it does not affect the opening of the locking valve, so the reliability of the shut-off action increases.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of an emergency operation valve device according to the present invention.

FIG. 2 is a right side view of the embodiment.

FIG. 3 is an enlarged view of a main part of FIG. 1;

FIG. 4 is a right side view of FIG.

FIGS. 5A and 5B are explanatory diagrams of the operation of the embodiment, in which FIG. 5A shows a state where the main valve is fully opened in normal times, FIG. 5B shows a state in the middle of an emergency, FIG. 5C shows a state where the main valve is fully closed, and FIG. When the main valve starts to open

FIG. 6 is a cross-sectional view of the embodiment at normal times.

FIG. 7 is an emergency sectional view of the embodiment.

FIG. 8 is a sectional view of another embodiment.

FIG. 9 is a sectional view of another embodiment of the emergency shutoff valve;
(A) is normal, (b) is emergency

FIG. 10 is a sectional view of another embodiment of the emergency release valve;
(A) is normal, (b) is emergency

FIG. 11 is an explanatory view of an emergency water storage tank facility.

FIG. 12 is a cross-sectional view of a conventional example.
(B) is an emergency

FIG. 13 is a sectional view of a conventional example.

[Explanation of symbols]

P Bypass pipe S Water main pipe T Water tank (tank) V Emergency operation valve (shutoff valve, open valve) 6, 7, 30 Pilot valve 10 Valve box 11a, 11b, 11c, 11d Valve V port (port) 14 valve Rod 16a, 16b, 16c Partition wall 17a First chamber 17b Second chamber 17c Third chamber 17d Fourth chamber 18a, 18b, 18c Communication hole 19a First valve seat 19b Second valve seat 19c Third valve seat 20a, 20b, 20c Valve body 22 Cylinder 23 Piston 24 Spring 25, 26, 27, t Pilot pipe 28 Bypass pipe 31a, 31b, 31c Port (port) of pilot valve 30 32 Pilot valve spring 33 Pilot valve cylinder 34 Pilot valve diaphragm 35 Pilot valve valve shaft 36 Pilot valve valve element 36a, 36b Pilot valve valve seat 40 Operating rod 2 off valve elongate holes 46 selectively opening and closing valve pin 45a links (locking valve) 45 Link 43a link (return-off valve)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 11/00-1/24 F16K 17/18-17/36 F16K 31/12-31/42

Claims (5)

(57) [Claims] 1. A pressure sensing type pilot valve 3 is provided in a fluid line S.
Emergency valves 1, 2, and V with 0, 6, and 7 attached,
The fluid pressure in the fluid line S is increased by pilot tubes t, 25, 2
The pilot valve is guided to the valve drive unit D of the emergency operation valve through the pilot valve through 6, 27. When an abnormality occurs in the internal pressure of the fluid line S, the abnormal pressure is detected by the pilot valve. The emergency valve is opened and closed by operating the valve element drive unit, and when the abnormal pressure becomes normal pressure, the normal pressure is detected by the pilot valve. In the automatic return type emergency operation valve device for operating the emergency operation valve to return the emergency operation valve, the pilot pipe is always allowed to flow freely, and is shut off when the opening and closing operation of the emergency operation valve by the valve drive unit in the case of the abnormality is completed. An emergency actuation valve device characterized in that: 2. The emergency operation valve device according to claim 1, wherein an operation of shutting off the pilot pipe at the time of the abnormality and an operation of not shutting off the pilot pipe can be selected. 3. An operation rod 40 which moves integrally with the valve bodies 20a, 20b, 8a is provided on an outer surface of a valve box of the emergency operation valve,
The operation rod 40 and the on-off valve 4 provided on the pilot pipe
2 is connected by a link mechanism, and at the time of the abnormality, the operation rod is moved based on the movement of the valve body to close the open / close valve and cut off the pilot pipe via the link mechanism. Item 7. The emergency operation valve device according to Item 1. 4. A pin connecting portion of the link mechanism is connected to a pin 43.
a is connected to the long hole 45a by the pin 43a.
The emergency valve apparatus according to claim 3, wherein the on-off valve (42) is operated after reaching the end of the valve (5a). 5. The emergency operating valve device according to claim 3, wherein the on-off valve is provided with a bypass pipe, and the bypass pipe is provided with a selective on-off valve. The emergency operation valve device according to claim 2, wherein the operation of shutting off the pilot pipe at the time of the abnormality and the operation not performing the shutoff operation can be selected.