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:
Dec. 23, 1980
Filed:
Apr. 26, 1978
Norman M Huff, Chicago, IL (US);
Harper-Wyman Company, Hinsdale, IL (US);
Abstract
A valve adapted to be connected in a fluid line for shutting off flow in response to fluid pressure in excess of a predetermined pressure. The valve includes a housing provided with inlet and outlet ports separated by a valve seat. A pressure chamber in the housing is defined by a diaphragm subjected to the pressure of fluid flowing through the housing. The diaphragm is a unitary, homogenous, fluid impervious snap disc movable between two over center stable positions. A valve member cooperating with the valve seat is connected to the diaphragm by a stem, and the valve is open in one diaphragm position and closed in the other diaphragm position. A spring biases the valve member toward the closed position and is adjusted to preload the diaphragm so that when fluid pressure exceeds a predetermined value the diaphragm moves from the valve open to the valve closed position. A reset member is carried by the diaphragm and permits manual reopening of the valve.