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:
Aug. 24, 1993
Filed:
Jan. 11, 1993
Walter W Powell, Sugar Land, TX (US);
Louis R Castaneda, Houston, TX (US);
Groth Corporation, Houston, TX (US);
Abstract
A diaphragm controlled spring loaded regulator is disclosed. Such regulator is adapted to regulate the flow of compressed gas applied to a gas blanket on top of liquids in a storage tank and to other low pressure applications. The regulator includes a piston in a valve body with an 'O' ring seat contacting an annular seating surface of the valve body. A compression spring is located on one end of the piston and a diaphragm actuator responsive to remote tank pressure is provided on the other end of the piston. At closure, the piston is pressure balanced. One arrangement is provided with a rollout seal in combination with an upper piston part and tapered cylinder walls such that after the piston begins to open, increased opening force is created due to inlet pressure acting on the upper piston part. As the piston begins to close, increased closing force is created due to inlet pressure. Another arrangement is provided such that with cracking of the 'O' ring seat with the annular seating surface, pressure is adjustably increased in the lower part of the valve so as to act against a lower part of the piston so as to increase opening force.