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:
Feb. 10, 1998
Filed:
Sep. 20, 1995
Richard D Williams, Sugar Land, TX (US);
Retsco, Inc., Houston, TX (US);
Abstract
A pressure relief valve has a moveable piston disposed in a body between inlet and outlet ports in the body. A volumetrically variable enclosed chamber is formed within the body with a portion of the chamber being defined by an upper surface of the piston. At least one aperture extends through the head of the piston providing a fluid passageway between an inlet port of the valve and the enclosed chamber. Fluid captured within the enclosed chamber permits initial rapid movement of the piston head to an open, or relieved, position in the event of a sharp increase in system pressure and provides a hydraulic cushion whereby impact shock of the head against internal valve components is attenuated.