HYDRAULIC DRIVE OF STOP VALVES Russian patent published in 2014 - IPC F16K31/122 F16K3/02 

FIELD: machine building.

SUBSTANCE: hydraulic drive of stop valves comprises a casing with channels for the supply of working medium, a spring-loaded stem able of axial displacement and installed inside the said casing. One stem end is able of providing for mechanical interaction with the stop valve operating member, mainly with the gate of a gate valve, and a hydraulic cylinder able of axial displacement together with the stem is mounted at the other stem end. Inside the said hydraulic cylinder there installed is a fixed piston attached by one end to the hydraulic drive casing and made as a profiled cylinder, mainly a hollow one. The channels for the supply of operating medium are connected to the end clearance between the said movable hydraulic cylinder and the fixed piston.

EFFECT: improved operational characteristics.

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