SU1710912A1 - Shut-off device - Google Patents

Abstract

The invention relates to stop valves and can be used to protect pipelines from hydraulic shocks and pressure fluctuations. The aim of the invention is to increase the reliability of the device. The locking device is installed in the protected pipeline 1. When the control pressure is supplied via the control line 15 to the overpiston cavity 5, the main valve 2 closes under the action of the piston 4. At the same time, the control medium enters through a pipe 18 77 ", wires 8 and 25 are controlled 17, two-way switch 16 and moves its spool (19). This leads to the communication of the piston cavity 13 of the actuator 10 with the drainage, and the overhead of the screw cavity 12 with the control pressure supply line. The relief valve 9 is closed at this time. After the piston has pressed the main valve onto the rod 24, the spool 23 is moved and the control cavity 16 of the switch 16 with the drainage communicates through it. The spool of the switch under the action of the spring 18 moves together with the over-piston cavity of the relief valve with drainage, and its sub-piston cavity with the control pressure line. The relief valve opens, providing a discharge of the working medium and eliminating the increase in pressure in the pipeline upstream of the main valve. 4 il. with S (L with to

Description

ten

3Ш0912

The invention relates to shut-off valves and can be used to protect pipelines from hydraulic shocks and pressure fluctuations by implementing the optimal law of shutting off their cross-section. It can be widely used in mechanical engineering and petrochemical industry.

The aim of the invention is to improve the reliability of the device, i

FIG. 1 shows a structural diagram of the proposed device; in fig. 2- bypass device; in fig. 3 - the position of the elements of the device in the initial period of closing the main valve; in fig. 4 - the position of the elements of the device 15 with full closing of the main valve.

The locking device contains (fig.ch) installed in the pipeline 1, the main valve 2 with the actuator 3, having a piston 4, the piston casing 5 and the piston casing 6, and the bypass device 7.

The inlet of the bypass device 7 is communicated by pipeline 8 with the over piston cavity 5. The relief valve 9 is made with an actuator 10 having a piston 11, a piston 11 around the piston.

20

four

The medium is vented to the drain line.

When pistons 4 and 11 of actuators 3, 10 begin to move, part of the working medium from pipeline 1 begins to flow into pipeline 14, which prevents sudden deceleration of flow before the main valve 2 and prevents pressure in protected pipeline 1 from increasing. When the piston 4 reaches the lowest points (Fig. 4) of the actuator 3 of the main valve 2 it acts on the stem 24 of the spool 23 of the bypass device 7 and changes its position so that the channel 26 of the spool 23 informs the pipelines 8 and 25, as a result of which the control medium enters the control The cavity 17 of the two-position switch 16. Under the influence of the control medium, the working body 19 of the two-position switch 16 changes its position, the spring 18 is compressed. In this case, the piston cavity 13 of the actuator 10 of the relief valve 9 is in communication with the drain line, and the over piston cavity 12 with the control supply line. Thus, there is a closure of the waste valve 9 after the closure 12 and the sub piston cavity 13, and the installation of 25 main valve 2.

installed in the discharge pipe 14. The lines of the control line 15 are connected to the piston actuators of the main valve 2 and the waste valve 9.

The two-way switch 16, when opening the main valve 2, the opening of the relief valve 9 does not occur, since its piston cavity 13 is in communication with the drainage line. Then under the influence of the spring 18 working body, 19 changes

Fully with the control cavity 17 and under- 30 its position, however, the piston cavity 13 of the relief valve 9 is still communicated with the drainage.

The locking device allows a smooth reduction of the flow rate through the pipe. d- bo to water 1 to zero and the delivery of the piston cavity 12 of the relief valve to the consumer is stopped by the spring 18 by the working body 19, made in the form of a spool with channels 20, 21. The two-position switch 16 is installed in line 15 of the control possibility of alternate communication

9 with sub-piston cavity 6 of main valve 2 and vice versa. The bypass device 7 is made in the form of a spring-loaded spool 23 with a stem 24 installed so that the latter can interact with the piston 4 when the main valve 2 is closed. The output of the bypass device 7 is communicated by pipeline 25 to the control cavity 17 of the switch 16. The valve 23 bypass device 7 is made with a through channel 26 and an L-shaped channel 27, which is permanently connected to the waste channel 28.

The device works as follows.

since the main valve 2 is completely closed. However, the discharge valve 9 can be closed for an arbitrarily long time and is determined by the parameters of its actuator 10 40 and switch 16.

With the greatest effect, the locking device can be used to protect pipelines from hydraulic shocks and pressure fluctuations that occur 45 when consumers disconnect.

Claims (2)

Claims of the Invention A locking device containing devices for closing (Fig. 3) the main valve 50 in the pipeline. by supplying the control medium to the nadporshnevaya cavity 5 of its actuator 3, the relief valve 9 opens at the same time, as the control medium through the channel 21 of the working body 19 of the two-position switch 16 enters the podpisnevoy cavity 13 of its actuator 10 . 10 of the relief valve 9 and the piston cavity 6 of the actuator 3 of the main valve 2 is controlled by a piston actuator and a bypass device, the input of which is in communication with its piston cavity, with a reciprocating valve with a piston actuator and a drive control line, characterized in that it is equipped with a two-position switch with a control cavity and a spring-loaded working body in the form of a spool, which is installed in the control line with the possibility 912 five 0 four The medium is vented to the drain line. When pistons 4 and 11 of actuators 3, 10 begin to move, part of the working medium from pipeline 1 begins to flow into pipeline 14, which prevents sudden deceleration of flow before the main valve 2 and prevents pressure in protected pipeline 1 from increasing. When the piston 4 reaches the lowest points (Fig. 4) of the actuator 3 of the main valve 2 it acts on the stem 24 of the spool 23 of the bypass device 7 and changes its position so that the channel 26 of the spool 23 informs the pipelines 8 and 25, as a result of which the control medium enters the control The cavity 17 of the two-position switch 16. Under the influence of the control medium, the working body 19 of the two-position switch 16 changes its position, the spring 18 is compressed. In this case, the piston cavity 13 of the actuator 10 of the relief valve 9 is in communication with the drain line, and the over piston cavity 12 with the control supply line. Thus, the discharge valve 9 closes after closing the main valve 2. When opening the main valve 2, the opening of the waste valve 9 does not occur, since its piston cavity 13 is in communication with the drain line. Then under the influence of the spring 18 working body, 19 changes its position, however, the piston cavity 13 of the waste valve 9 is still communicated with the drainage. from the moment the main valve is completely closed 2. The closure of the waste valve 9 can occur for an arbitrarily long time and is determined by the parameters of its actuator 10 and switch 16. With the greatest effect, the locking device can be used to protect pipelines from hydraulic shocks and pressure fluctuations that occur when consumers disconnect. Claims: Locking device containing a main valve installed in the pipeline piping main valve with a piston drive and a bypass device, the input of which is in communication with its sub piston cavity, with a dump valve with a piston drive and a drive control line, characterized in that, in order to increase reliability, it is equipped with a two-position switch with a control cavity and a spring-loaded working body in the form of a spool that is installed in the control line with the possibility successive communication of the over-piston cavity of the relief valve with the piston cavity of the main one and vice versa, the bypass device is made in the form of a PS & spring spool with a stem installed  tew switch with the possibility of the latter interacting with the main valve actuator piston when it is closed, with the outlet of the bypass device communicating with the control lanes 23 Phage. 2 26 at 1710912