JPH1061817A - Emergency valve drive - Google Patents

Abstract

(57) [Summary] [Problem] To prevent an emergency operation during normal operation. A pump (8) is connected to one oil chamber (4a) of a cylinder (3) via a first circuit (7) with a check valve (5).
The tank 11 is connected to the other oil chamber 4b via a second circuit 10 with a check valve 9, and the tank 11 is connected via third and fourth circuits 12 and 13 connected to the oil chambers 4a and 4b of the cylinder 3, respectively. A servo device 14 for operating the cylinder 3 and the pump 8 are connected via a fifth circuit 15, and the fifth circuit 15 is connected to each check valve 5, 9 via a sixth circuit 16, The sixth circuit 16 is provided with a first electromagnetic switching valve 17 and the fifth circuit 15
A second electromagnetic switching valve 18 is provided downstream of the sixth circuit connecting point, and the second electromagnetic switching valve 18 is provided downstream of the second electromagnetic switching valve 18 of the fifth circuit 15 and downstream of the first electromagnetic switching valve 17 of the sixth circuit 16. Are communicated through the communication circuit 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency valve drive device for fully closing or fully opening an emergency valve provided in the middle of a flow path for flowing a high-temperature fluid such as an oil refinery plant in an emergency.

[0002]

2. Description of the Related Art FIG. 4 shows an example of this type of emergency valve driving apparatus. For example, a piston rod 3a of a cylinder 3 is connected to an emergency valve 2 interposed in a flow path 1 of an oil refining plant or the like, and a check valve 5 is connected to an oil chamber 4a while being partitioned by a piston 3b of the cylinder 3. The pump 8 is connected via a first circuit 7 with an accumulator 6, and the tank 11 is connected to the other oil chamber 4 b of the cylinder 3 via a second circuit 10 with a check valve 9. A servo device 14 for operating the cylinder 3 and a pump 8 are connected via a fifth circuit 15 via third and fourth circuits 12 and 13 connected to the chambers 4a and 4b. 15 and the check valves 5 and 9 are in the sixth circuit 1
6, the sixth circuit 16 is provided with a first electromagnetic switching valve 17, and the fifth circuit 15 is provided with a second electromagnetic switching valve 18 downstream of the sixth circuit connection point.

In the above configuration, during normal operation, the check valves 5 and 9 are closed by the pressure oil of the pump 8 via the first electromagnetic switching valve 17 as shown in FIG. The emergency valve 2 is kept open by preventing oil from being supplied to the one oil chamber 4a of the cylinder 3 and preventing the pressurized oil from escaping from the other oil chamber 4b of the cylinder 3 to the tank 11.

Further, pressure oil is supplied from the pump 8 to the servo device 14 via the second electromagnetic switching valve 18, and the servo device 1
4 is operated to operate the cylinder 3. In an emergency, the first electromagnetic switching valve 17 is switched by an emergency signal, and the second electromagnetic switching valve 18 is also switched in conjunction with the switching. As a result, the drive of the servo device 14 is stopped, and the pressure oil applied to the check valves 5 and 9 is released.
By releasing the check valves 5 and 9 by releasing the check oil to the tank 20 through the cylinder 9, the pressure oil of the pump 8 is supplied to one oil chamber 4 a of the cylinder 3 and the other oil chamber of the cylinder 3 4b to the tank 10 to release the pressurized oil
Is driven to close the flow path 1 (the virtual line state in FIG. 4).

[0005]

In the above-mentioned conventional configuration,
During normal operation, if only the first electromagnetic switching valve 17 is switched due to some accident, the emergency operation is stopped and the emergency valve 2
Is completely closed. Conversely, in an emergency, when the first electromagnetic switching valve 17 is switched based on the emergency signal, but the second electromagnetic switching valve 18 is not switched,
The emergency valve 2 is fully closed temporarily based on the emergency signal,
After a lapse of time, the emergency signal becomes inaudible and the emergency operation cannot be performed.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide an emergency valve drive device which can prevent an emergency operation from occurring during normal operation and can surely perform an emergency operation in an emergency.

[0007]

According to a first aspect of the present invention, a pump is connected to one oil chamber of an emergency valve driving cylinder via a first circuit with a check valve. A tank connected to the other oil chamber of the cylinder via a second circuit with a check valve, and a servo for operating the cylinder via third and fourth circuits connected to the respective oil chambers of the cylinder. The device and the pump are connected via a fifth circuit, the fifth circuit and the check valves are connected via a sixth circuit, and the sixth circuit is provided with a first electromagnetic switching valve. A second solenoid-operated switching valve is provided downstream of the sixth circuit connection point of the fifth circuit, and the check valves are normally closed via the first solenoid-operated switching valve by the pressure oil of a pump. At the same time, the servo device is driven by the pressure oil of the pump via the second electromagnetic switching valve In an emergency, by switching the first and second electromagnetic switching valves, the drive of the servo device is stopped, and the check valves are opened to supply the pressure oil of the pump to the one oil chamber of the cylinder. To supply
An emergency valve drive device in which pressure oil is released from the other oil chamber of the cylinder to the tank to drive the emergency valve, and the emergency valve is driven downstream of the second electromagnetic switch valve of the fifth circuit and the first electromagnetic switch valve of the sixth circuit. It is characterized in that it is communicated with a further downstream side via a communication circuit.

In the above configuration, during the normal operation, each check valve is closed by the pressure oil of the pump via the first electromagnetic switching valve, so that the pressure oil of the pump is not supplied to one oil chamber of the cylinder. At the same time, the emergency oil is kept in the fully open state or the fully closed state so that the pressure oil does not escape from the other oil chamber of the cylinder to the tank.

[0009] Further, pressure oil is supplied from the pump to the servo device via the second electromagnetic switching valve, and the servo device is driven to operate the cylinder. In an emergency, the first electromagnetic switching valve is switched by the emergency signal, and the second electromagnetic switching valve is also switched in conjunction with the switching. This stops the driving of the servo device and releases the pressure oil applied to each check valve, thereby opening each check valve, whereby the pressure oil of the pump is transferred to one oil chamber of the cylinder. At the same time, the pressurized oil is released from the other oil chamber of the cylinder to the tank to drive the emergency valve.

In this case, even if only the first solenoid-operated directional control valve is switched due to some accident during the normal operation, the pressure oil which has passed through the second electromagnetic directional control valve passes through the communication circuit and is applied to both the check valves. The emergency operation can be continued without interrupting the emergency operation, and the emergency valve can be kept fully open or fully closed. Further, since it is only necessary to add a communication circuit, the production cost can be suppressed to a slightly higher level.

According to a second aspect of the present invention, a pump is connected to one oil chamber of the emergency valve driving cylinder via a first circuit with a check valve, and a second oil chamber of the cylinder is provided with a check valve. The tank is connected via two circuits, and a servo device for operating the cylinder via third and fourth circuits connected to the respective oil chambers of the cylinder and the pump are connected via a fifth circuit. And the fifth circuit and each of the check valves are connected to the sixth circuit.
Connected via a circuit, the sixth circuit is provided with a first electromagnetic switching valve, and the fifth circuit is provided with a second electromagnetic switching valve downstream of a sixth circuit connection point.
The check valves are closed via the first electromagnetic switching valve by the pressure oil of the pump, and the servo device is driven via the second electromagnetic switching valve by the pressure oil of the pump. By switching the electromagnetic switching valve of No. 2, the drive of the servo device is stopped, and the check valves are opened to supply the pressure oil of the pump to one oil chamber of the cylinder and the other oil of the cylinder. In the emergency valve drive device configured to release the pressurized oil from the chamber to the tank to drive the emergency valve, a third circuit connecting the one oil chamber of the cylinder and the servo device passes through the first electromagnetic switching valve. The third and sixth circuits are shut off by switching the first electromagnetic switching valve in an emergency.

In the above configuration, the operational effects during normal operation and during an emergency are almost the same as those of the first aspect. In this case, in an emergency, the first electromagnetic switching valve is switched based on the emergency signal, but even when the second electromagnetic switching valve is not switched, by switching the first electromagnetic switching valve,
The third circuit connecting the one oil chamber of the cylinder and the servo device is shut off, and the cylinder is no longer operated by the servo device, so that the emergency valve can be driven. Further, since the third circuit is merely configured to pass through the first solenoid-operated directional control valve, the production cost is hardly increased.

According to a third aspect of the present invention, a pump is connected to one oil chamber of the emergency valve driving cylinder via a first circuit with a check valve, and a second oil chamber of the cylinder is provided with a check valve. The tank is connected via two circuits, and a servo device for operating the cylinder via third and fourth circuits connected to the respective oil chambers of the cylinder and the pump are connected via a fifth circuit. And the fifth circuit and each of the check valves are connected to the sixth circuit.
Connected via a circuit, the sixth circuit is provided with a first electromagnetic switching valve, and the fifth circuit is provided with a second electromagnetic switching valve downstream of a sixth circuit connection point.
The check valves are closed via the first electromagnetic switching valve by the pressure oil of the pump, and the servo device is driven via the second electromagnetic switching valve by the pressure oil of the pump. By switching the electromagnetic switching valve of No. 2, the drive of the servo device is stopped, and the check valves are opened to supply the pressure oil of the pump to one oil chamber of the cylinder and the other oil of the cylinder. An emergency valve drive device configured to release the pressurized oil from the chamber to the tank to drive the emergency valve, wherein the emergency valve drive device is located downstream of the second electromagnetic switching valve of the fifth circuit and downstream of the first electromagnetic switching valve of the sixth circuit. Are connected via a communication circuit, and a third circuit connecting the one oil chamber of the cylinder and the servo device is configured to pass through the first electromagnetic switching valve, and switches the first electromagnetic switching valve in an emergency. By doing so, the third and sixth It is characterized in that the road is blocked.

In the above configuration, the operational effects during normal operation and during an emergency are almost the same as those of the first aspect. In this case, even if only the first solenoid-operated directional control valve is switched during normal operation due to some kind of accident, the normal operation state can be continued without falling into an emergency operation as in the first aspect of the invention. Further, in an emergency, the first solenoid-operated switching valve is switched based on the emergency signal, but even if the second solenoid-operated switching valve is not switched, the operation of the cylinder by the servo device is performed similarly to the second aspect of the invention. No more, the emergency valve can be activated.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an emergency valve driving device according to a first embodiment of the present invention.
The downstream side of the second electromagnetic switching valve 18 of No. 5 and the downstream side of the first electromagnetic switching valve 17 of the sixth circuit 16 are communicated via the communication circuit 22. Since the configuration other than the above is substantially the same as the conventional example shown in FIG. 4, the same portions are denoted by the same reference numerals and description thereof will be omitted.

In the above configuration, the operational effects during normal operation and during an emergency are substantially the same as those of the conventional example shown in FIG. In this case, even if only the first electromagnetic switching valve 17 is switched due to some accident during the normal operation, the pressure oil that has passed through the second electromagnetic switching valve 18 passes through the communication circuit 22 to the two check valves 5 and 9. As a result, the emergency operation can be continued without interrupting the emergency operation, and the emergency valve 2 can be kept fully open. In addition, since it is only necessary to add the communication circuit 22, the manufacturing cost can be suppressed to a slightly higher level.

FIG. 2 shows an emergency valve driving device according to a second embodiment of the present invention, in which a third circuit 12 for connecting one oil chamber 4a of the cylinder 3 and the servo device 14 has five circuits.
The first and second circuits 12 and 16 are shut off by switching the first electromagnetic switching valve 17 in an emergency when the first electromagnetic switching valve 17 is formed as a port 2 position type. I have to.

In the above configuration, the operational effects during normal operation and during an emergency are substantially the same as those of the conventional example shown in FIG. In this case, in an emergency, the first
Although the electromagnetic switching valve 17 is switched, the second electromagnetic switching valve 1
When the first electromagnetic switching valve 17 is switched, the third circuit 12 is shut off and the operation of the cylinder 3 by the servo device 14 is not performed even if the first electromagnetic switching valve 8 is not switched. Can be closed. Further, since the third circuit 12 is merely configured to pass through the first electromagnetic switching valve 17, the manufacturing cost is hardly increased.

FIG. 3 shows an emergency valve driving device according to a third embodiment of the present invention. The emergency valve driving device according to the first embodiment shown in FIG. 1 and the second embodiment shown in FIG. Are combined.

In the above configuration, the operational effects during normal operation and during an emergency are substantially the same as those of the conventional example shown in FIG. In this case, even if only the first electromagnetic switching valve 17 is switched due to some accident during the normal operation, it is possible to continue the normal operation state without falling into the emergency operation as in the first embodiment. Also, in an emergency, the first electromagnetic switching valve 17 is switched based on the emergency signal, but even if the second electromagnetic switching valve 18 is not switched,
As in the second embodiment, the operation of the cylinder 3 by the servo device 14 is not performed, and the emergency valve 2 can be driven to the fully closed state.

In each of the above embodiments, the emergency valve 2
Has been described as an example, but the present invention can also be applied to a case where the emergency valve 2 is fully opened in an emergency.

[0022]

According to the first aspect of the present invention, even if only the first electromagnetic switching valve is switched due to some accident during normal operation, the pressure oil passing through the second electromagnetic switching valve passes through the communication circuit. Therefore, the emergency operation does not occur, so that the normal operation state can be continued and the emergency valve can be maintained in the fully open state or the fully closed state. Further, since it is only necessary to add a communication circuit, the production cost can be suppressed to a slightly higher level.

According to the second aspect of the invention, in an emergency,
Although the first solenoid-operated switching valve is switched based on the emergency signal, the first solenoid-operated switching valve is not switched even if the second solenoid-operated switching valve is not switched.
By switching the electromagnetic switching valve, the third circuit connecting the one oil chamber of the cylinder and the servo device is cut off, and the cylinder is not operated by the servo device, so that the emergency valve can be driven. Also, since the third circuit is merely configured to pass through the first electromagnetic switching valve,
The production cost hardly increases.

According to the third aspect of the invention, even if only the first solenoid-operated directional control valve is switched due to some accident during the normal operation, the emergency operation does not occur as in the first aspect of the invention. The normal operation state can be continued, and in the event of an emergency, the first electromagnetic switching valve is switched based on the emergency signal, but the second electromagnetic switching valve is not switched. Similarly, the operation of the cylinder by the servo device is stopped, and the emergency valve can be driven.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an emergency valve driving device according to a first embodiment of the present invention.

FIG. 2 is a schematic view of an emergency valve driving device according to a second embodiment of the present invention.

FIG. 3 is a schematic view of an emergency valve driving device according to a third embodiment of the present invention.

FIG. 4 is a schematic view showing a conventional example.

[Explanation of symbols]

 3 Emergency valve drive cylinder 4a One cylinder oil chamber 4b Cylinder other oil chamber 5 Check valve 7 First circuit 8 Pump 9 Check valve 10 Second circuit 11 Tank 12 Third circuit 13 Fourth circuit 14 Servo device 15 Fifth circuit 16 Sixth circuit 17 First electromagnetic switching valve 18 Second electromagnetic switching valve 22 Communication circuit

Claims (3)

[Claims] A pump is connected to one oil chamber of an emergency valve driving cylinder via a first circuit with a check valve, and a tank is connected to the other oil chamber of the cylinder via a second circuit with a check valve. Are connected, a servo device for operating the cylinder via third and fourth circuits connected to each oil chamber of the cylinder, and the pump are connected via a fifth circuit,
The fifth circuit and each of the check valves are connected via a sixth circuit, and the sixth circuit is provided with a first electromagnetic switching valve.
A second electromagnetic switching valve is provided downstream of the sixth circuit connection point of the fifth circuit, and the check valves are normally closed via the first electromagnetic switching valve by the pressure oil of the pump, The drive of the servo device is stopped by driving the servo device via the second electromagnetic switching valve with the pressure oil of the pump, and in an emergency, by switching the first and second electromagnetic switching valves, thereby stopping the driving of the servo device. An emergency valve drive device that opens a check valve and supplies pressure oil of a pump to one oil chamber of the cylinder, and releases the pressure oil from the other oil chamber of the cylinder to the tank to drive the emergency valve. An emergency valve driving device, wherein a downstream side of the second electromagnetic switching valve of the fifth circuit and a downstream side of the first electromagnetic switching valve of the sixth circuit are communicated via a communication circuit. 2. A pump is connected to one oil chamber of the emergency valve driving cylinder via a first circuit with a check valve, and a tank is connected to the other oil chamber of the cylinder via a second circuit with a check valve. Are connected, a servo device for operating the cylinder via third and fourth circuits connected to each oil chamber of the cylinder, and the pump are connected via a fifth circuit,
The fifth circuit and each of the check valves are connected via a sixth circuit, and the sixth circuit is provided with a first electromagnetic switching valve.
A second electromagnetic switching valve is provided downstream of the sixth circuit connection point of the fifth circuit, and the check valves are normally closed via the first electromagnetic switching valve by the pressurized oil of the pump. The servo device is driven via the second electromagnetic switching valve by the pressure oil of the pump, and in an emergency, the driving of the servo device is stopped by switching the first and second electromagnetic switching valves to stop the driving of the servo device. An emergency valve drive device that opens a check valve and supplies pressure oil of the pump to one oil chamber of the cylinder, and releases the pressure oil from the other oil chamber of the cylinder to the tank to drive the emergency valve. , A third circuit connecting the one oil chamber of the cylinder and the servo device is the first circuit.
It is configured to pass through a solenoid-operated directional control valve.
An emergency valve drive device wherein the third and sixth circuits are shut off by switching the electromagnetic switching valve. 3. A pump is connected to one oil chamber of the emergency valve driving cylinder via a first circuit with a check valve, and a tank is connected to the other oil chamber of the cylinder via a second circuit with a check valve. Are connected, a servo device for operating the cylinder via third and fourth circuits connected to each oil chamber of the cylinder, and the pump are connected via a fifth circuit,
The fifth circuit and each of the check valves are connected via a sixth circuit, and the sixth circuit is provided with a first electromagnetic switching valve.
A second electromagnetic switching valve is provided downstream of the sixth circuit connection point of the fifth circuit, and the check valves are normally closed via the first electromagnetic switching valve by the pressure oil of the pump, The drive of the servo device is stopped by driving the servo device via the second electromagnetic switching valve with the pressure oil of the pump, and in an emergency, by switching the first and second electromagnetic switching valves, thereby stopping the driving of the servo device. An emergency valve drive device that opens a check valve and supplies pressure oil of a pump to one oil chamber of the cylinder, and releases the pressure oil from the other oil chamber of the cylinder to the tank to drive the emergency valve. A downstream side of the second electromagnetic switching valve of the fifth circuit and a downstream side of the first electromagnetic switching valve of the sixth circuit are communicated via a communication circuit, and connects one oil chamber of the cylinder to a servo device. A third circuit passes through the first electromagnetic switching valve. Is configured to, by switching the first electromagnetic switching valve in an emergency, third, the emergency valve driving apparatus circuit of the sixth, characterized in that it is cut off.