Check valve

Details Check valve Check valve

2006-08-29

2006-08-29

Rivell, John (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S543210, C137S540000, C251S337000

Reexamination Certificate

active

07096884

ABSTRACT:
A check valve comprising a poppet urged by a conical spring to annularly seal uniformly around its entire periphery to assure more uniform cracking pressure about its entire periphery. The cracking pressure may be adjusted by means of an adjustable plate which reduces the length of the conical spring and thereby increase the amount of force exerted by the spring onto the poppet into sealing engagement, thereby increasing the cracking pressure.

REFERENCES:
patent: 2449683 (1948-09-01), Akerman et al.
patent: 3878861 (1975-04-01), Pareja
patent: 3937249 (1976-02-01), Suey
patent: 4108204 (1978-08-01), Day
patent: 4838300 (1989-06-01), Seabase
patent: 5349984 (1994-09-01), Weinheimer et al.

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