Pumps – Motor driven – Electric or magnetic motor
Patent
1976-05-10
1977-05-03
Schwadron, Martin P.
Pumps
Motor driven
Electric or magnetic motor
251141, 417311, 417505, 417568, F04B 4900
Patent
active
040211525
ABSTRACT:
An electromagnetic pump of the reciprocating type comprising a relief valve mechanism adapted to minimize the magnitude of pulsations of the fluid delivered by the pump and at the same time to act as a pressure accumulator. The relief valve mechanism comprises a pressure adjusting cylinder maintained in communication with the outlet side of the pump, a spring-loaded balancing plunger slidably mounted in the pressure adjusting cylinder, and a pressure adjusting screw adjustably mounted in the mechanism for regulating the biasing force of the spring so as to adjust the pressure applied by the spring to the balancing plunger to any level as desired. The pressure adjusting cylinder is formed therein with a relief port through which communication can be maintained between the outlet side of the pump and the suction side of the pump when a rise in the delivery pressure of the pump causes the pressure adjusting plunger to move rearwardly a predetermined distance against the biasing force of the pressure adjusting spring, whereby the delivery pressure of the pump can be maintained at a predetermined level at all times by spilling off the excess fluid from the pressure adjusting cylinder through the relief port.
REFERENCES:
patent: 3380387 (1968-04-01), Kofink
patent: 3523676 (1970-08-01), Barker
patent: 3670274 (1972-06-01), Ellison
patent: 3833015 (1974-09-01), Knever
patent: 3874822 (1975-04-01), Nakamura
patent: 3877841 (1975-04-01), Nakamura
Hershkovitz Abraham
Schwadron Martin P.
Taisan Industrial Co., Ltd.
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