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. 02, 1982
Filed:
Jul. 25, 1980
Richard S Brumm, Orinda, CA (US);
Grove Valve and Regulator Company, Oakland, CA (US);
Abstract
A pressure intensifying system for low differential service particularly adapted for use in a gas transmission system which is conditioned to operate in response to pressure differentials. For example, where a pilot valve normally delivers a gas at regulated pressure to the jacket of an expansible tube main valve, the gas is here asserted against a diaphragm in the first of two cylinders in tandem. The diaphragm works against a spring to drive a piston in a smaller diameter, hydraulic cylinder, which delivers the liquid at pressures so intensified to the expansible tube valve jacket. When pressures are relatively high, the intensified liquid pressure ensures a seal, even at low differentials. Conversely, at low pressures which cannot overcome the spring, as when the jacket is being dumped, the piston is fully retracted and the hydraulic cylinder is vented to atmosphere. Hence, at low pressures only atmospheric pressure is asserted in the jacket.