The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 1977
Filed:
May. 10, 1976
Akira Toyoda, Tokyo, JA;
Taisan Industrial Co., Ltd., Tokyo, JA;
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.