Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1992-12-04
1995-02-28
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Direct response valves
251287, F16K 1503
Patent
active
053928121
ABSTRACT:
An offset hinge flapper valve has a single valve plate rotatably mounted in the flow channel of a cast housing. The valve plate is freely rotatable about a pivot pin welded to the housing. The valve plate has first and second co-planar parts extending on respective sides of its axis of rotation, which is offset from the center axis of the flow channel. These co-planar parts have peripheral edges configured so that the valve plate has the same shape as the shape of the flow channel taken along an oblique section of the cast housing. A brace having an abutment surface is mounted on the valve plate. When the valve plate rotates to a predetermined inclined angle relative to the flow, the brace contacts the housing, thereby blocking further rotation and preventing flutter or instability of the valve plate in the open position. In the event of a loss of supply pressure, the backflow will exert an opposite moment on the valve plate, rotating it to an angular position whereat the valve plate closes off the flow channel.
REFERENCES:
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patent: 3941151 (1976-03-01), Biddle
patent: 4301833 (1981-11-01), Donald
patent: 4908028 (1990-03-01), Colon et al.
General Electric Company
Nilson Robert G.
Shay Bernard E.
Squillaro Jerome C.
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