METHOD AND DEVICE FOR SEALING CONICAL VALVING MEMBER Russian patent published in 1995 - IPC

FIELD: valving. SUBSTANCE: fluid pressure in the space of flexible ring-shaped seal is maintained at the level of opening pressure when the valving member is in opening. When the valving member is in closing the pressure is decreased up to the value of the fluid pressure downstream of the valving member. The passage made in the valving member is through. Two bypassing valves spring-loaded to each other are received in the passage. The stops are mounted inside the housing to permit control of their lengths and interaction with the by-passing valves at the inlet and outlet respectively. The member is spring-loaded by way of a spring in the direction of the seat. The spring force between the by- passing valves is greater than the pressure force affecting valves at a moment of the member opening. EFFECT: enhanced reliability. 3 cl, 1 dwg