INTERCEPTING AUTOMATIC VALVE Russian patent published in 2009 - IPC F16K17/02 F16K39/04 

FIELD: machine building.

SUBSTANCE: inside valve casing there are located two gates linked to rod. The first gate is shutoff and implemented in the form of rod with piston with holes and sealing surface. The second gate is a shutoff and implemented in the form surrounding piston of stepped bushing with sealing surface, herewith its external stages are adjoined to stages implemented in casing. Rod is implemented with additional piston with formation of over-piston cavity, connected by channel to outlet channel and under-piston cavity, herewith area of over-piston cavity is less than area of under-piston cavity. Under-piston cavity through normally open electromagnetic valve is connected to entrance channel and through normally closed electromagnetic valve - to output channel in which it is installed pressure gauge indicating-signalling connected to both electromagnetic valves.

EFFECT: implementation of automatic overlapping of high-pressure tubing at accident pressure reduction in it and automatic opening after pressure boost in pipeline over valve higher accidental.

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