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. 10, 1988
Filed:
Jul. 06, 1987
Ernest A DiBartolo, Sarasota, FL (US);
Sun Hydraulics Corp., Sarasota, FL (US);
Abstract
A direct-acting, differential piston relief valve has a spring chamber pressurized with fluid from a passage through the piston. The fluid within the chamber is at the same pressure as that at the inlet valve and provides a valve closing pressure against the inner face of the piston. The piston face at the inlet valve has an annular extension. The inner circumference of this extension meets the spherical valve seat when the valve is closed. The diameter of the inner face of the piston is smaller than the diameter of the piston face annular extension. Inlet pressure working on this area difference produces the hydraulic force which is opposed by the spring. No piston face area is exposed to forces tending to close the valve due to Bernoulli effects when the valve begins to open. The spring within the spring chamber has spring guides at each end which contain a ball. The ball transmits the spring force to the piston on one end and a sealed closure at the other end.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile