Self-flushing needle valve

Details Self-flushing needle valve Self-flushing needle valve

2006-02-08

2008-09-30

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

Valves and valve actuation

With material guide or restrictor

Movable or resilient guide or restrictor

C251S282000, C137S874000, C073S040000

Reexamination Certificate

active

07429027

ABSTRACT:
A needle valve with a hollow needle effective for permitting a portion of the fluid passing through the valve to flow throughout the valve and exit through any leaks in the valve, whereby any environmental fluid within the valve is displaced by the fluid passing through the valve.

REFERENCES:
patent: 3318577 (1967-05-01), Banks
patent: 3976279 (1976-08-01), Walker
patent: 4341370 (1982-07-01), Banks
patent: 5014716 (1991-05-01), Ogawa
patent: 5386965 (1995-02-01), Marchal
patent: 2004/0099832 (2004-05-01), Gessaman
Brooks Instrument, Design Specifications, DS 8744; Oct. 1998, pp. 1-4.

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