Seat arrangement with cavity pressure relief for a ball valve

Details Seat arrangement with cavity pressure relief for a ball valve Seat arrangement with cavity pressure relief for a ball valve

2011-08-23

2011-08-23

Bastianelli, John (Department: 3753)

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

C251S175000, C251S192000, C251S315010, C251S317000, C277S641000, C277S644000, C277S928000

Reexamination Certificate

active

08002237

ABSTRACT:
A ball valve seat arrangement is provided that permits relief of cavity pressure. The arrangement includes a valve body for receiving a resilient annular seat. First passages in the seat provide communication between the valve cavity, and a space formed between the seat and the valve body. When the cavity pressure reaches a certain level, a sealing point between the seat and the valve body is lost. Communication is thereby provided between the space and the valve passage to achieve cavity pressure relief.

REFERENCES:
patent: 3488033 (1970-01-01), Priese
patent: 4157170 (1979-06-01), McClurg
patent: 4236691 (1980-12-01), Wright
patent: 4385747 (1983-05-01), Renaud, Jr. et al.
patent: 4557461 (1985-12-01), Gomi et al.
patent: 4681326 (1987-07-01), Kubo
patent: 6938879 (2005-09-01), Bancroft et al.
patent: 2653241 (2004-11-01), None

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