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:
Jan. 17, 1978
Filed:
Jul. 21, 1976
Boyd P Sliger, Concord, TN (US);
Robertshaw Controls Company, Richmond, VA (US);
Abstract
A self-contained vent valve unit for a liquid system wherein liquid is to substantially fill a cavity and thereafter be pressurized in the cavity, the valve unit having a first valve arrangement adapted to be disposed in fluid communication with the cavity for venting air from the cavity during low pressure filling of the cavity with the liquid. The first valve arrangement is adapted to automatically close upon the pressurization of the liquid in the cavity to a first certain value thereof. The valve unit has a second valve arrangement also adapted to be disposed in fluid communication with the cavity for venting the liquid from the cavity when the pressure of the liquid reaches a second certain value thereof.