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:
Jun. 23, 1987
Filed:
Sep. 12, 1986
Christos Athanassiu, Winchester, MA (US);
Bellofram Corporation, Burlington, MA (US);
Abstract
A switching valve for delivering fluids from different inlets to a pumping outlet utilizes a pressure responsive spool movable due to a pressure differential in the inlets to one position wherein one of the inlets feeds the outlet and a second position wherein the other of the inlets feeds the outlet. The spool carries a pair of umbrella valves for effectively controlling the flow of fluid to the outlets as well as a pair of biasing springs acting on each side of a piston diaphragm which has limited travel on the spool. An adjustable detent arrangement is provided on the end of the spool to keep the spool travel balanced and cooperates with the springs to furnish a snap acting valve.