STOP AND CONTROL DEVICE FOR AUTOMATIC ISOLATION OF GAS WELL PIPELINE Russian patent published in 2010 - IPC F16K17/34 

FIELD: construction.

SUBSTANCE: invention is intended for use in well gas-condensate deposits for automatic closure of high pressure pipeline in case of emergency pressure value in it. Stop and control device comprises stop mechanism 1 installed in gas pipeline with inlet 2 and outlet 3 channels and working cavity of control 5. Pilot valve 12 is arranged in the form of spring-loaded distributor, connected by channel 18 to source of control medium 19, and by channel 20 - to cavity of stop mechanism control. Device is equipped with the third 21 and fourth 22 channels with check valve 23 installed in the latter. Channel 21 communicates working cavity of control to inlet channel of locking mechanism. Channel 22 communicates pilot valve 12 to outlet channel 3 of stop mechanism. Pilot valve 12 in one position communicates channel 18 and channel 20, and in the other - channel 20 and channel 22. Stop mechanism is arranged as stop and control with controlled support 4. Working cavity of control 5 represents under-piston cavity of piston drive 6. In above-piston cavity there is a controlled support 4 installed. This cavity is connected to inlet channel 2 via through axial channel 8 in stem 9 of piston 10. Spring-loaded distributor is arranged as two-position and installed over piston drive 6 with creation of cavity 11 connected to outlet channel 3. In channel 21 upstream inlet channel 2 there is a unit of inhibitor 24 batching, which is intended to automatically maintain specified flow of inhibitor supplied to gas well pipeline in order to prevent formation of hydrates.

EFFECT: control of gas well gas flow and automatic maintenance of specified inhibitor flow.

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