Check valve with locking key and pull cord

Details Check valve with locking key and pull cord Check valve with locking key and pull cord

2006-08-29

2008-12-30

Rivell, John (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C251S083000

Reexamination Certificate

active

07469713

ABSTRACT:
A check valve for an inflatable device 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. In one embodiment the check valve comprises a locking key to lock the valve closed irrespective of the cracking pressure that may otherwise may have cracked the valve open. In another embodiment, the check valve comprises a manual dump feature that allows rapid dumping of air from the inflatable irrespective of low cracking pressure that may exist in the inflatable.

REFERENCES:
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patent: 2449683 (1948-09-01), Akerman et al.
patent: 2788192 (1957-04-01), Mountford
patent: 3045608 (1962-07-01), Ratterman, Jr.
patent: 3707987 (1973-01-01), Gordon
patent: 3878861 (1975-04-01), Pareja
patent: 3937249 (1976-02-01), Suey
patent: 3965916 (1976-06-01), Karas
patent: 4108204 (1978-08-01), Day
patent: 4838300 (1989-06-01), Seabase
patent: 5255712 (1993-10-01), Foster
patent: 5349984 (1994-09-01), Weinheimer et al.
patent: 7096884 (2006-08-01), Mackal et al.

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