VALVE DRIVEN WITH WORKING MEDIUM Russian patent published in 2012 - IPC F16K39/04 

FIELD: machine building.

SUBSTANCE: valve driven with working medium includes body with inlet and outlet holes. Shutoff element is made in the form of seats and a gate valve arranged between them. The above gate valve is attached to piston stock. Piston stock is connected to housing of piston drive. Cavities of the latter are connected through controlled valves to cavities of housing before and after the gate valve. Piston is connected to position indicator. Ejector in the form of a nozzle located with a gap relative to the housing is located after the seat located after the gate valve in medium flow direction. Cavity of housing after the gate valve is made in the form of in-series located components: suction chamber connected to controlled valves, mixing chamber and diffuser. Motion sensor is connected to position indicator. Controlled valves are connected to control unit. Controlled valves are connected to cavity before the gate valve through a filter.

EFFECT: providing the valve operability under conditions of low differential pressure on it at full opening; reduction of pressure variation after the gate valve as it opens; improvement of operating reliability under conditions of low pressures, flow rates and availability of contaminated working medium.

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