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:
Apr. 04, 1978
Filed:
Jun. 21, 1976
Joseph G Keeney, Town of Tonawanda, NY (US);
C. H. Heist Corporation, Clearwater, FL (US);
Abstract
A pressure relief valve including a housing, first and second bores in axial alignment in the housing, first and second plungers in the first and second bores, respectively, a third bore in the first plunger, a seal between the first and second plungers with the end of the second plunger being located in communication with the third bore, a first conduit for placing the housing in communication with a source of fluid pressure to expose the first plunger thereto and also expose a portion of the second plunger thereto through the third bore, a shear pin for holding the second plunger in position whereby the fluid pressure on the first and second plungers is exerted on the shear pin, a plurality of radial bores in the housing proximate the seal between the first and second plungers, and a second conduit in communication with the radial bores for conducting high pressure fluid from the housing upon shearing of the shear pin and after movement of the second plunger away from the first plunger.