Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1974-07-11
1976-03-23
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Direct response valves
F16K 1502
Patent
active
039453987
ABSTRACT:
The invention provides an unbalanced, butterfly check valve including a hollow main body member having a frusto-conical valve seat disposed interiorly therein, and a valve closure member in the form of a generally circular plate having a frusto-conical periphery conforming to the valve seat; the valve closure member is disposed for pivotal movement about an axis normal to the axis of the main body member and laterally offset from the center thereof. The center of gravity of the valve closure member biases the same to the closed position and is located such that the torque required to open the valve decreases as the closure member moves from its closed position to its open position. The closure member may be also fluid-dynamically profiled so as to remain open in response to a minimum flow condition and to rapidly become closed upon the occurrence in a change in flow direction.
REFERENCES:
patent: 215887 (1879-04-01), Crossman et al.
patent: 1707942 (1929-04-01), Petit
patent: 1744798 (1930-01-01), Price
patent: 2273118 (1942-02-01), Langdon
patent: 2711188 (1955-06-01), Nickerson
patent: 2900998 (1959-08-01), Lortz
patent: 3290001 (1966-12-01), Taylor
patent: 3448465 (1969-06-01), Pierce et al.
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