SU1350435A1 - Device for controlling close-control fittings - Google Patents

Abstract

The invention relates to reinforcement and is intended to control the flow of a cryogenic medium. The aim of the invention is to increase the reliability of the valves by eliminating the possible decrease in the control pressure due to the imbalance of the throttle device. When the button 15 is pressed, the electromechanical actuator 7 of the control valve 4 is turned on and the control gas enters the control cavity of the valve 1. The signal from the electrical contacts 12, when the valve body is in the extreme position, goes to the actuator of the double-acting valve 10, which, when activated, informs the pipeline 2 through the throttle valve a device 9 with a source of control gas, under the action of pressure of which the valve 1 is closed, compartment the flow of the working medium. If necessary, pressing the button 14 de-energizes the actuator 7 and the valve body 4 is installed in an intermediate position, providing, taking into account the flow through the throttle device 9, a certain pressure in the control cavity of valve 1, which corresponds to a certain value of its flow area, and this provides the required flow through the valve. 1 il. & (L Uralbral gas cleaning S drainage from SL o 4 CO JV

Description

This invention relates to a valve and is intended to control the flow of a cryogenic medium.

The purpose of the invention is to improve the reliability of the valves and fittings by eliminating the possible decrease in the control pressure due to the imbalance of the throttle device.

The drawing shows the device, a General view in section.

The device contains a shut-off control valve 1, the control cavity of which is connected to pipe 2, is equipped with a valve 3, with a source of control pressure through a control valve 4. Valve 4 contains an inlet 5 with a valve 6 for supplying control gas and electromechanical drive 7. Pipeline 2 is also connected to the discharge line through pipe 8 through the throttle device 9.

The device is also equipped with a valve 25 2.5 MPa and is maintained for

10 double acting with an electromagnetic drive, through which the output of the throttle device 9 is additionally connected by a pipeline 11 with a source of control gas.

The control valve 4 is provided with electrical contacts 12 of the extreme position, connected to the power supply circuit of the electromagnetic actuator of the valve 10, and the power supply circuit of the electromechanical actuator 7 is combined with the power supply circuit of the electromagnetic drive and has a time relay 13 installed in it. The operation of the electromechanical actuator 7 of the control valve 4 is controlled by the button 14 Stop, button 15 Open and button 16 Closed through the time relay 13.

The device p ,, works as follows.

The valve 1 is placed on the main gas stream having a cryogenic temperature. In order to overcome condensation, helium gas with a pressure of 2.5 MPa is commonly used as a control gas.

The valves 3 and 6 are opened, and then pressing the button 15 supplies power to the electromechanical actuator 7, while the valve 4 is opened by moving the valve block 4. At the same time, the signal from the elec- tric contacts 12 valve 10 double

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The operation is set in such a position that the pipeline 8 is connected to the gas-holder. The control helium enters through valve 4 and pipeline 2 into valve 1 and is discharged through a throttle device 9 into a drain. During the full stroke of the valve body 4, when opening the valve, the pressure of the control gel in valve 1 will increase to 1.6 MPa, and valve 1 will block the flow of the gel. In order to carry out the pressure and seal the valve 1, it is necessary to increase the pressure of the control gel to 2.5 MPa and provide a signal to the double-acting valve 10, the valve switches, the discharge of gas into the drain stops, and the control gas through pipelines 11 and B, the throttle the device 9 and the pipe 2 enters the valve 1. The pressure in the control cavity of the valve 1 rises to

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the entire period of complete closing of the valve 1.

To open the valve 1, the button 16 is pressed, and the signal is applied to the switching of the valve 10, thereby stopping the flow of control gas to the valve 1 and providing the drainage of the control gas. The signal to turn on the motor of the electromechanical actuator 7 is delayed by the time relay 13 for a period equal to the time of decreasing the pressure of the control gas in valve 1 to 1.6 MPa. Next, the actuator 7 closes the valve 4 and the pressure of the control gas in the device decreases, and the valve 1 opens.

If it is necessary to stop the valve 1 in an intermediate position, then press the button 14, at a signal from which the actuator 7 stops, thus the movement of the locking member of the valve 4 stops. At the intermediate position of the locking member of the valve 4, the flow of control gas is discharged into the drain through the throttle device 9.

Claims (1)

Invention Formula Device To control valves and fittings, containing 5 shut-off and control valves, the control cavity of which is communicated by pipeline with the control pressure valve and through a control valve, five 0 31350435 supplied with an electromechanical drive-in addition communicated with the source , about the house, the pipeline is connected to the supervolving pressure, and the discharge control through the throttle-setting valve is equipped with an electric valve, which, with the end position, is switched on that, in order to increase the reliability of the electromagnetic supply circuit, it is equipped with a double-conductor valve, and the electromechanical supply circuit with an electromagnetic drive is combined with the supply circuit of the throttle device through the electromagnetic drive and in it The specified double acting valve is fitted with a time relay.