Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1977-10-11
1980-06-10
Schwadron, Martin P.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 46, 251120, 138 43, 138 46, 137DIG3, F16K 31126
Patent
active
042069017
ABSTRACT:
A metering apparatus for controlling the rate of closure of a pressure-actuated valve of a type normally used in irrigation systems. When a pressure-actuated valve is closing, fluid from a supply line must flow into a pressure-actuating chamber, gradually filling it to force the valve's plug member against its seat. The metering apparatus is a compressible spring through which fluid must flow to enter this pressure-actuating chamber. As the valve closes, it compresses the spring through which the fluid must flow, thereby restricting the rate of flow into the pressure-actuating chamber. This reduction in flow reduces the rate at which the valve's plug member approaches its seat in an exponential manner, allowing rapid closure at first which is reduced considerably as the plug approaches its seat. Such a restricted closure rate prevents pressure shock in the supply line, otherwise known as hammering or chatter, which causes damage and excess wear and tear to the supply line, to the pressure-actuated valve and to other valves in the line.
REFERENCES:
patent: 1046236 (1912-12-01), Wagner
patent: 1625921 (1927-04-01), Vallier
patent: 2604119 (1952-07-01), Hughes
patent: 3151628 (1964-10-01), Heckert
patent: 3367621 (1968-02-01), Griswold
patent: 3556464 (1971-01-01), Griswold
patent: 3896834 (1975-07-01), Paul, Jr.
patent: 3967808 (1976-07-01), Lieding
Schwadron Martin P.
Thompson Manufacturing Co.
Walton G. L.
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