Lift check valve with dashpot

Details Lift check valve with dashpot Lift check valve with dashpot

1975-10-14

1977-09-06

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

F16K 1506

Patent

active

040461645

ABSTRACT:
An improved check valve has an operating chamber with a disc disposed therein which is capable of axial movement from a closed position against a valve seat to an opened position to prevent feedwater from flowing from the normal outlet to the normal inlet of the valve. A cylindrical member extends upwardly from the disc through a fixedly mounted baffle plate which generally separates an upper portion of the operating chamber from the lower portion. A piston is mounted on an extended end of the cylindrical member to generally define a dashpot chamber between the piston and the baffle plate. The dashpot chamber entraps a greater volume of feedwater when the valve is open than when closed to limit valve closure rate by limiting the rate at which feedwater leaves the dashpot chamber during closure.

REFERENCES:
patent: 816216 (1906-03-01), Cash
patent: 1029600 (1912-06-01), Foster
patent: 2216296 (1940-10-01), Raymond

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