Dual disc low pressure back-check valve

Details Dual disc low pressure back-check valve Dual disc low pressure back-check valve

1984-09-26

1985-12-03

Schwadron, Martin P.

Fluid handling

Line condition change responsive valves

Direct response valves

137843, 604247, F16K 1514

Patent

active

045560862

ABSTRACT:
A low pressure back-check valve comprising a valve housing with a fluid inlet and outlet, a valve seat, and a dual disc valve element normally biased into closed position against the valve seat by mechanical support structure within the housing. One of the dual discs is made of pure gum rubber and/or like material, while the other disc is made of semi-rigid plastic material, such as unplasticized Polyvinyl Chloride (PVC). The mechanical support structure includes a pair of pins spaced 180.degree. apart. While these pins constantly hold the dual discs in biased position against the valve seat, because of the compliant construction of the dual discs, the valve can open under a very low pressure, such as 0.02 pounds per square inch.

REFERENCES:
patent: 2800920 (1957-07-01), Smith
patent: 3625211 (1971-12-01), Butler
patent: 3807445 (1974-04-01), McPhee
patent: 3889710 (1975-06-01), Brost
patent: 4141379 (1979-02-01), Manske
patent: 4222407 (1980-09-01), Ruschke et al.
patent: 4354492 (1982-10-01), McPhee
patent: 4415003 (1983-11-01), Paradis et al.

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