Double flapper check valve

Details Double flapper check valve Double flapper check valve

1984-08-27

1985-08-27

Cohan, Alan

Fluid handling

Convertible

Reversible check

137270, 1374939, 137512, F16K 1712

Patent

active

045372136

ABSTRACT:
A housing is divided into two chambers. A tube connects the two chambers. The end of the tube forms a valve seat on each end. The valve seat in one chamber angles upward and the valve seat in the opposite chamber angles downward. A flapper valve is attached above the top of the valve seat which angles upward, and at the bottom of the valve seat which angles downward. Gravity acting upon the flapper valves will hold one in the open position and the other in the closed position unless it is opened by a flow of fluid. Turning the housing upside down will reverse the position of the flapper valves so that the permitted fluid flow will be reversed.

REFERENCES:
patent: 898524 (1908-09-01), Northup
patent: 1528703 (1925-03-01), Showers
patent: 1821992 (1931-09-01), Stevens
patent: 4033375 (1977-07-01), Hirsch
patent: 4296772 (1981-10-01), Nilsson

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