Vacuum check valve

Details Vacuum check valve Vacuum check valve

1985-08-30

1987-02-17

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

137526, 13753325, F16K 1506

Patent

active

046432213

ABSTRACT:
A vacuum check valve member has a lip arrangement, which provides one sealing portion, and an inner reinforced second sealing portion, the valve member, and particularly the valve lip, acting to tend to pull itself closed with minimal flow across valve member in the valve closing direction. The inner sealing portion bottoms out at high differential pressures and is reinforced by a rigid valve body so that the valve member does not rely on the lip alone for full closure. The lip is flexible throughout the normal operating temperature range likely to be encountered, and upon opening when any ice crystals are formed thereon will flex and break up such ice crystals as the valve member is opening, preventing the valve member from sticking under extremely cold weather conditions. The valve operates without having a valve spring continually urging the valve member toward engagement with the valve seat.

REFERENCES:
patent: 2736338 (1956-02-01), Britton
patent: 2973008 (1961-02-01), Klose
patent: 4215717 (1980-08-01), Trosch
patent: 4368755 (1983-01-01), King

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