Air operated fluid control valve

Details Air operated fluid control valve Air operated fluid control valve

2005-11-29

2005-11-29

Lee, Kevin (Department: 3753)

Fluid handling

With casing, support, protector or static constructional...

Guards and shields

C251S062000, C251S063000

Reexamination Certificate

active

06968855

ABSTRACT:
This invention relates to an improved air operated fluid control valve which tends to inhibit or impede the travel of a fluid to the air controlled side of the control valve. The air operated fluid control valve includes a control valve having a valve body provided with at least one fluid inlet port and at least one fluid outlet port, at least one air inlet port and at least one air outlet port, and a piston assembly selectively controlled by the air inlet and outlet ports so as to regulate the flow of a fluid through the valve body from the at least one fluid inlet port to the at least one fluid outlet port. According to one preferred embodiment of this invention, the control valve includes at least one shield member carried by piston assembly which is operative to inhibit the travel of a fluid from a fluid side of the control valve into an air controlled side of the control valve.

REFERENCES:
patent: 2694545 (1954-11-01), Steenbergh
patent: 6672561 (2004-01-01), Kerg et al.

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