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:
Jul. 26, 1977
Filed:
Dec. 07, 1971
Gene W Osheroff, Las Vegas, NV (US);
Laurence McGann, Los Angeles, CA (US);
McQuay-Perfex Inc., Minneapolis, MN (US);
Abstract
In the present invention, four valves are connected in tandem to form a closed loop. A pair of inlet channels and a pair of outlet channels are connected between the valves and in such a manner as to form a bridge-circuit arrangement. The valves are preferably disc-shaped chambers with orifices in their rooves by means of which they interconnect with one another. In each valve is also located a diaphragm resting on the floor of the valve chamber and which may be raised and pressed against the roof of the chamber to cover the orifices there, thereby closing that particular valve. By thusly closing one pair of diagonally opposing valves or the other, the connections between the inlet and outlet channels can be reversed. The diaphragms can be raised by applying a relatively high pressure to their undersides through orifices located in the floors of their respective valve chambers.