KR200182633Y1 - Emergency closing apparatus for hydraulic butterfly valve - Google Patents

Abstract

The present invention relates to an emergency closing device of a hydraulically operated butterfly valve. Conventional hydraulically operated butterfly valve has a problem that it is not possible to quickly cope with an emergency because of the long time it takes for the opening and closing drive oil coming out of the hydraulic cylinder in the event of a power outage to return to the oil tank. The present invention provides a throttle / check valve and an open side hydraulic line and a close side hydraulic line connected to an open side port and a close side port of a hydraulic cylinder constituting a hydraulic opening / closing mechanism for opening and closing a valve disc installed in a butterfly valve body. A hydraulically actuated butterfly valve connected to a pump line, a main tank line and a sub tank line through a check valve with a pilot and an open / close control valve, wherein the open side hydraulic line is closer to the hydraulic cylinder side than the throttle / check valve. Connect the emergency closing oil return line between the auxiliary tank line and the emergency closing oil return line.When the power is applied, the shutoff port corresponds to the emergency closing oil return line. Emergency shutoff operation is achieved by installing a shot-off valve that matches the emergency return oil return line. It is made to be one to quickly respond to an emergency.

Description

Emergency closing device of hydraulically operated butterfly valve {EMERGENCY CLOSING APPARATUS FOR HYDRAULIC BUTTERFLY VALVE}

The present invention relates to a hydraulically driven butterfly valve, and more particularly to a hydraulically driven butterfly valve emergency closing device to close quickly in an emergency.

In general, a butterfly valve is classified into a manually operated butterfly valve, an electrically driven butterfly valve and a hydraulically driven butterfly valve according to an open / close drive method.

Conventionally, the hydraulically operated butterfly valve is a hydraulic valve mechanism including a cylindrical valve body, a valve disc rotatably installed in the valve body, a hydraulic cylinder for opening and closing the valve disc, and opening and closing the actuator to the hydraulic cylinder. It is configured to include a hydraulic circuit for supplying oil.

When the hydraulically operated butterfly valve is opened by the control unit, power is applied to the solenoid valve open / close control valve to operate the open / close control valve to the open position, and the open / close drive oil pressurized by the oil pump is opened to the open side port of the hydraulic cylinder. When the piston rod of the hydraulic cylinder is retracted, the valve disc is rotated in the opening direction, and the opening / closing drive oil supplied during the closing operation flows out from the closing side port to return to the oil tank. The on / off control valve is operated in the closed position so that the open / close drive oil pressurized by the oil pump is supplied to the closed side port of the hydraulic cylinder, and the piston rod of the hydraulic cylinder moves forward to rotate the valve disc in the closed direction and open operation at the open side port. The opening and closing drive oil supplied at the time of spill was spilled It is.

Thus, in order to maintain the open or closed state, an intermediate stop valve having an oil supply port and a shutoff port is installed between the pump line and the open / close control valve. In order to be connected through and maintained in a constant open or closed state, the blocking port is configured to be located between the pump line and the tank line and the open / close control valve.

On the other hand, in general, the butterfly valve is used in large pipes over 1000mm in diameter, such as water pipes. Generally, by installing a check valve with a pilot and a throttle / check valve in the middle of the open side hydraulic line and the close side hydraulic line, the flow rate of the open / close drive oil flowing through the open side hydraulic line and the close side hydraulic line is reduced. It is designed to take more than 1 minute to fully open at full open or full open at full close.

In addition, when an emergency such as a power failure occurs, power is cut off from the solenoid valve open / close control valve to operate.

On the other hand, the butterfly valve installed in such a large pipeline is closed automatically when the power is cut off by the opening / closing control valve, which is a solenoid valve, when the power failure occurs.

However, even in the case of a power failure in the related art, as in the normal closing operation, the opening and closing drive oil exiting from the open side port of the hydraulic cylinder returns to the tank line through the open side hydraulic line, and the pilot in the middle of the open side hydraulic line. Attached check valve and throttle / check valve, etc., it takes longer for the opening and closing operation oil to return to the oil tank. There was a problem that can not respond quickly to an emergency, such as causing a serious problem that is damaged by the impact.

Accordingly, an object of the present invention is to provide an emergency closing device of a butterfly valve that can be closed quickly when an emergency such as a power failure occurs so that problems such as a pipeline and a valve being damaged by pressure and shock can be eliminated. .

1 is a side view and a hydraulic system of the valve showing a normal open state of the hydraulically operated butterfly valve to which the emergency closing device according to the present invention is applied.

2 is a front view of the valve of FIG.

Figure 3 is a side view and a hydraulic system of the valve showing a normal closed state (normally closed) of the hydraulically operated butterfly valve to which the emergency closing device according to the present invention is applied.

4 is a front view of the valve of FIG.

Figure 5 is a side view and a hydraulic system showing an intermediate stop state of the hydraulically driven butterfly valve applied emergency closing device according to the present invention.

Figure 6 is a side view and a hydraulic system of the valve showing an emergency close (emergency close) state of the hydraulically driven butterfly valve applied emergency closing device according to the present invention.

** Description of symbols for the main parts of the drawing **

1: valve body 2: valve disc

12: hydraulic cylinder 13a: opening side port

13b: closed port 21: oil tank

22: oil pump 23a: open side hydraulic line

23b: Closed side hydraulic line 24a: Pump line

24b: main tank line 24c: auxiliary tank line

25: on-off control valve 30: emergency return oil return line

31: shot-off valve

In order to achieve the object of the present invention, the open side hydraulic line and the closed side hydraulic line respectively connected to the open side port and the close side port of the hydraulic cylinder constituting the hydraulic opening and closing mechanism for opening and closing the valve disc installed in the butterfly valve body In the hydraulically operated butterfly valve which is connected to the pump line, the main tank line and the auxiliary tank line through a throttle / check valve, a check valve with a pilot, and an open / close control valve, the open side hydraulic line has a throttle / check valve. Connect the emergency closing oil return line between the position close to the hydraulic cylinder side and the auxiliary tank line.In the middle of the emergency closing oil return line, when the power is applied, the shutoff port coincides with the emergency closing oil return line. If the A ↓ T port is set to the emergency return oil return line, An emergency closing device for a hydraulically actuated butterfly valve is provided.

Hereinafter, the emergency closing device of the butterfly valve according to the present invention will be described in detail according to the embodiment shown in the accompanying drawings.

1 and 2 are views showing a normal closed state of the butterfly valve to which the emergency closing device is applied according to the present invention, Figures 3 and 4 are views showing a normal closed state, the emergency closing device according to the present invention is applied As shown in the drawing, the butterfly valve is rotatably installed at both ends of the cylindrical valve body 1 and the support shafts 2a and 2b on the valve body 1, thereby providing an intermediate portion of the valve body 1. To the valve disc 2 to open and close, the hydraulic opening and closing mechanism 10 coupled to one side of the support shaft (2a) of the valve disc 2 to open and close the valve disc 2, and the hydraulic opening and closing mechanism 10 It is configured to include a hydraulic circuit 20 for supplying the hydraulic pressure for opening and closing operation.

A valve seat 1a is formed on an inner circumferential surface of the valve body 1, and an outer circumference of the valve disc 2 is formed in a round shape so as to be in close contact with the valve seat 1a.

Receiving portions 3a and 3b supporting the support shafts 2a and 2b are formed on both sides of the outer circumferential surface of the valve body 1.

The hydraulic opening / closing mechanism 10 includes an opening / closing mechanism body 11 installed at one side of the valve body 1, a hydraulic cylinder 12 installed at the opening / closing mechanism body 11, and the hydraulic cylinder 12. It consists of a link mechanism 14 for transmitting a linear reciprocating motion to the one side support shaft (2a) with a rotational force.

The hydraulic cylinder 12 is fixed to the opening mechanism body 11 to be installed so that the piston rod 12a protrudes downward.

The link mechanism 14 has a first link 15 connected to the piston rod 12a of the hydraulic cylinder 12 by a hinge pin 15a and one end fixed to the one side support shaft 2a, and the other end thereof. The second link 16 is connected to the first link 15 by a hinge pin 16a.

One side of the opening and closing mechanism body 11 is provided with an opening and closing angle indicator 17 for displaying the rotation angle of the support shaft (2a, 2b) and the valve disk (2).

The opening / closing angle indicator 17 is composed of an indicator 17a fixed coaxially with the one side support shaft 2a, and an indication disc 17b fixed to the opening / closing mechanism body 11.

The indicator disk 17b is marked with a scale 17c indicating the opening and closing and opening and closing angles.

The hydraulic circuit 20 includes an oil tank 21 for storing the opening and closing driving oil, a main oil pump 22 for compressing the opening and closing driving oil of the oil tank 21, and an open side of the hydraulic cylinder 12. To the open side hydraulic line 23a connected to the port 13a, to the closed side hydraulic line 23b connected to the closed side port 13b of the hydraulic cylinder 12, and to the main oil pump 22. The pump line 24a, the main tank line 24b connected to the oil tank 21, the auxiliary tank line 24c, the open side hydraulic line 23a, the closed side hydraulic line 23b and the pump. Installed between the line 24a and the main tank line 24b to allow the oil pump 22 to be selectively connected to the open side port 13a and the closed side port 13b of the hydraulic cylinder 12, as well as the oil tank. And an opening / closing control valve 25 for selectively connecting 21 to the open side port 13a and the close side port 13b of the hydraulic cylinder 12.

The open / close control valve 25 has a P ↑ A port 25a and a B ↓ T port 25b at a first position where power is applied, and P↗ at a second position when power is cut off. A 4 port 2 position solenoid valve with a B port 25c and an A 포트 T port 25d is used.In the open position with the power applied, the P ↑ A port 25a is opened by the solenoid action. The pump line 24a is connected to the open side hydraulic line 23a, and the B ↓ T port 25b is connected to the main tank line 24b and the closed side hydraulic line 23b. In the closed position, the P B B port 25c connects the pump line 24a and the closing side hydraulic line 23b by the restoring force of the spring, and the A↘T port 25d opens the opening side hydraulic line 23a. And the main tank line 24b and the auxiliary tank line 24c are installed to be in a state of connecting.

An intermediate stop valve 26 is installed between the open / close control valve 25 and the pump line 24a and the main tank line 24b.

The intermediate stop valve 26 has a P ↑ X port 26a and an X ↓ T port 26b at a first position located when power is applied, and P↗ at a second position located when the power is cut off. A 4-port 2 Position solenoid valve with a B port 26c and an X↘T port 26d is used, and in the energized open / closed operating position, the P↗B port 26c is the pump line 24a. ) Is selectively connected to the P ↑ A port 25a or P↗B port 25c of the open / close control valve 25, and the P ↑ X port 26a is pumped at the intermediate stop position where the power is cut off. It is connected so that it may be connected to the line 24a, and the X-T port 26b will be connected to the main tank line 24b.

Between the open / close control valve 25 and the ports 13a, 13b of the hydraulic cylinder 12, the check valves 27a, 27b with a pilot, the throttle / check valves 28a, 28b, and the stop valves 29a, 29b Is installed.

An emergency closing oil return line 30 is connected between the throttle / check valves 28a and 28b of the opening side hydraulic line 23a and the stop valves 29a and 29b and between the main tank line 24b. The shot off valve 31 is provided in the middle of the emergency closing oil return line 30.

The shot-off valve 31 has an A ↓ T port 31a in the first position, and a two-port two-position solenoid valve in which the shutoff port 31b is installed is used in the second position, and when the power is applied, the solenoid action is performed. The A ↓ T port 31a is connected to the emergency closing oil return line 29, the auxiliary tank line 24c and the main tank line 24b by means of a spring restoring force when the power is cut off. 31b) is connected to the emergency closing oil return line 29 and the main tank line (24b) is installed so that the oil supply and oil return is not made.

The shutoff port 31b of the shot-off valve 31 may be configured in a state in which the port itself is closed, but it is preferable to install bidirectional check valves 31c and 31d for more reliable shutoff.

In the drawings, reference numeral 22a is a driving motor for driving the main oil pump 22, 32 is a manual oil pump for manually generating hydraulic pressure when a malfunction of the main oil pump 22 is performed, and 33a and 33b are Each is a check valve and 34 is a pressure gauge.

Hereinafter, the opening and closing operation of the hydraulically driven butterfly valve according to the present invention.

First, when the closing operation is performed in the control chamber in the open state as shown in FIG. The stop valve 26 is retracted by the restoring force of the spring (moves in the right direction in the drawing) so that the pump line 24a and the closing side hydraulic line 23b are controlled by the port P↗B of the intermediate stop valve 26 and the opening and closing control. In addition to being connected via the port P↗B of the valve 25, the opening side hydraulic line 23a and the main tank line 24b are switched to the state connected via the port A↘T of the open / close control valve 25. And the opening and closing drive oil pressurized by the oil pump 22 and supplied to the pump line 24a is connected to the port P↗B of the intermediate stop valve 26 and the port P↗B of the open / close control valve 25. It is supplied to the closing side port 13b of the hydraulic cylinder 12 through the closing side hydraulic line 23b to advance the piston rod 12a, In the opening side port 13a of the pressure cylinder 12, the opening / closing drive oil which flowed in during the opening operation flows out and the port A) T of the opening side hydraulic line 23a and the opening / closing control valve 25 and the main tank Return to oil tank 21 via line 24b.

Accordingly, the first link 15 connected to the piston rod 12a of the hydraulic cylinder 12 by the hinge pin 15a rotates in a clockwise direction and descends, and is connected to the first link 15 by the hinge pin 16a. The second link 16 is rotated in the clockwise direction, so that the one side support shaft 2a on which the second link 16 is fixed is rotated in the clockwise direction so that the valve disc 2 is rotated in the clockwise direction. As shown in FIG. 3, it is in a closed state.

When the opening operation is performed in the control room in the closed state as shown in FIG. 3, the intermediate stop valve 26 is maintained in a state where the power is cut off, and power is applied to the on / off control valve 25 to open / close the control valve ( 25 is advanced by the operation of the solenoid (moving in the left direction in the drawing), so that the pump line 24a and the open side hydraulic line 23a are connected to the port P↗B and the open / close control valve 25 of the intermediate stop valve 26. ) And the closed hydraulic line (23b) and the main tank line (24b) are connected through the port (P ↓ B) of the open / close control valve 25 to the oil pump. The opening and closing drive oil pressurized by the 22 and supplied to the pump line 24a is opened through the opening side hydraulic line 23a through the port P ↑ A of the opening and closing control valve 25. It is supplied to the side port 13a to retract the piston rod 12a (upward movement in the drawing), and the hydraulic cylinder ( In the closing port 13b of 12), the opening / closing drive oil introduced during the closing operation flows out and the port B ↓ T of the opening / closing side hydraulic line 23b and the opening / closing control valve 25 and the main tank line 24b) is returned to the oil tank 21.

Accordingly, the first link 15 connected to the piston rod 12a by the hinge pin 15a is rotated in the counterclockwise direction, and thus the one side support shaft 2 on which the second link 16 is fixed is raised. This counterclockwise rotation causes the valve disc 2 to rotate counterclockwise so as to be opened as shown in FIG.

In addition, when power is applied to the intermediate stop valve 26 in the state in which the above-described opening and closing operation is completed, the intermediate stop valve 26 is advanced by the solenoid action (moves to the left in the figure) and the port P ↑ X is connected to the pump line ( 24a), the port X ↓ T is switched to the state connected to the main tank line 24b, respectively, so that the opening and closing driving oil supplied from the oil pump 22 to the pump line 24a is connected to the port P ↑ X. Blocking, the opening and closing drive oil returning to the oil tank 21 through the open side hydraulic line (23a) or the closed side hydraulic line (23b) from the hydraulic cylinder 12 is blocked at the port (X ↓ T) to the hydraulic cylinder The opening and closing drive oil supplied to (12) and acting in an open or closed state is stagnant to maintain an open or closed state.

At this time, the opening and closing driving oil returned from the open side hydraulic line 23a or the close side hydraulic line 23b reaches the pilot check valves 27a and 27b through the throttle / check valves 28a and 28b. The opening and closing driving oil supplied from the pump line 24a is blocked by the P ↑ X port 26a of the intermediate stop valve 26 so that no hydraulic pressure acts on the pilot lines of the pilot check valves 27a and 27b. Therefore, the opening and closing driving oil returned from the open side hydraulic line 23a or the closed side hydraulic line 23b is blocked by the pilot check valves 27a and 27b, so that the intermediate stop action is accurately performed.

On the other hand, when the power is interrupted, the power supply of the on-off control valve 25, which is a solenoid valve, is cut off and automatically switched to the closed operation state, and the power of the shot-off valve 31 is also cut off. The valve 31 is switched to a state in which the A ↓ T port 31a corresponds to the emergency closing oil return line 30 by the restoring force of the spring, so that the opening and closing driving oil exiting from the opening side hydraulic line 23a is piloted. ↓ T port (31a) and auxiliary tank line of the emergency return oil return line (30) and shot-off valve (31) directly without passing through the check valve (27a, 27b) and the throttle / check valve (28a, 28b). By returning to the oil tank 22 through the 24c and the main tank line 24b, the flow of the opening and closing drive oil for operating the hydraulic cylinder 12 is made quickly, and as a result, the butterfly valve is quickly closed. .

As described above, according to the present invention, since the opening and closing driving oil returned from the hydraulic cylinder to the oil tank is rapidly returned during the emergency closing process due to a power failure, a serious problem that the pipeline or the valve is damaged by pressure and shock can be eliminated. There is an effect of being able to respond quickly to emergencies.

Claims (2)

An open side hydraulic line and a close side hydraulic line connected to the open side port and the close side port of the hydraulic cylinder constituting the hydraulic open / close mechanism for opening and closing the valve disc installed in the butterfly valve body are equipped with a throttle / check valve and a pilot. In the hydraulically operated butterfly valve connected to the pump line, the main tank line and the auxiliary tank line through a check valve and a control valve, The emergency closing oil return line is connected to the open side hydraulic line between the position closer to the hydraulic cylinder side than the throttle / check valve and the auxiliary tank line, and when the power is applied in the middle of the emergency closing oil return line, the shutoff port is emergency. Emergency closing device of hydraulically actuated butterfly valve, which is matched with closing oil return line and when power is cut off, A ↓ T port is provided with shot-off valve matching with emergency closing oil return line. 2. The emergency closing device of a hydraulically actuated butterfly valve according to claim 1, wherein the blocking port is provided with a bidirectional check valve.