Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1978-03-27
1979-12-04
Weakley, Harold W.
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
137461, 13750513, 13751629, 1375195, F16K 3114
Patent
active
041766792
ABSTRACT:
A check valve is disclosed which uses a valve body having a bore with a first section smaller than a second section, an inlet communicating with the first section to receive flowing fluid, a shoulder disposed between the first section and the inlet for providing a valve seat, and an outlet communicating with the second section for discharging the fluid. A valve element is mounted within the inlet for engaging with the valve seat to shut off the fluid flow. A movable piston is mounted with the valve body to control movement of the valve element. The piston has a body portion slidably mounted with the second section, the body portion having a shoulder facing away from the valve element; a male portion is slidably mounted with the first section and extends from the body portion, the male portion having a shoulder facing toward the valve element; and a stem extends from the male portion into the inlet of the valve body for mounting with the valve element. A passageway is provided in the piston for placing the first and second sections into communication; an opening force is provided on the movable piston by pressure from the fluid in the second section; and a closing force is provided on the movable piston by the pressure of the incoming fluid acting on the valve element and the male portion shoulder. The fluid flow is checked with the pressure of the incoming fluid is sufficiently great to cause the closing force to override the opening force.
REFERENCES:
patent: 1820138 (1931-08-01), Hargis
patent: 2285049 (1942-06-01), Parks
patent: 2929401 (1960-03-01), Cowan
patent: 3106226 (1963-10-01), Machen
patent: 3407827 (1968-10-01), Follett
patent: 4120315 (1978-10-01), Snyder
Matthews Guy E.
Weakley Harold W.
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