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. 30, 1986
Filed:
Dec. 09, 1985
Douglas W Smith, Port Coquitlam, CA;
Devron Engineering Limited, North Vancouver, CA;
Abstract
A check valve to be interposed between a source of pressure and a device to be moved by the application of the pressure. The valve has a passageway communicating with the source of pressure and a passageway communicating with the device. There is a valve seat formed between the two passageways and a valve member contacts the valve seat. A valve stem can move the valve member to rest on the valve seat to close the valve but the stem is separate from the valve. With lessening of pressure in the source of pressure beyond a desired level the check valve may be closed. Movement of the valve stem to a position away from the valve member ensures that the valve will open but only when the pressure on each side of the valve is about the same. A particular application is to protect the lip of a head box in a paper making machine but may applications are possible.