High-pressure bi-directional valve

Details High-pressure bi-directional valve High-pressure bi-directional valve

2007-05-24

2010-02-09

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

Balanced valves

Reciprocating

C251S063500, C251S063600

Reexamination Certificate

active

07658366

ABSTRACT:
A control element of a bi-directional valve is in fluid communication with an outlet pressure and an inlet pressure when the valve is closed such that a sum of the forces applied to the control element result in a net force urging the control element to seat against a valve seat. The valve includes a valve body carrying the valve seat. The control element is balanced on an outlet side of the valve seat such that the outlet pressure applies approximately no net force to the control element. In contrast, the control element is unbalanced on an inlet side of the valve seat such that inlet pressure applies a net force on the control element to bias the control to seat against the valve seat.

REFERENCES:
patent: 6422531 (2002-07-01), Sich
patent: 6488258 (2002-12-01), Dantlgraber et al.
patent: 6691980 (2004-02-01), Larsen et al.
patent: 6986362 (2006-01-01), Cheong
patent: 2006/0197049 (2006-09-01), Hamada et al.
patent: 41 29 774 (1993-03-01), None
patent: 2006318339 (2006-11-01), None
International Search Report for PCT/US2008/063949 dated Aug. 29, 2008.

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