Butterfly-type check valve

Details Butterfly-type check valve Butterfly-type check valve

1991-03-06

1991-10-15

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

251308, 251218, F16K 1503

Patent

active

050565575

ABSTRACT:
The invention is a butterfly-type check valve (8) wherein the valve plate (18) moves translationally relative to a pivot axis (90) and incident to its own rotational movement. The invention employs biasing means (102, 104, 108) for initiating movement of the valve plate when the latter is at a closed rotational position, thereby eliminating the need for a pilot valve.

REFERENCES:
patent: 2641485 (1953-06-01), Dupuy
patent: 4964422 (1990-10-01), Ball

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