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:
Sep. 28, 1976
Filed:
Jul. 17, 1975
Norman Edward Harthun, San Carlos, CA (US);
Telford Smith, Inc., San Carlos, CA (US);
Abstract
A combination shut-off pressure surge relief and reverse flow prevention valve is disclosed comprising manually rotatable valve stem with a movable valve member at its lower end that is biased towards its closed position by a spring so that flow in a normal direction will open the valve but reverse flow is prevented. The pressure surge relief valve is completely enclosed within the rotatable valve stem and comprises a spring loaded slidable piston that is movable by abnormal pressure surges to expose relief ports for allowing controlled leakage under surge conditions. The leakage from the ports is deflected by a surrounding shroud on the handle of the valve stem.