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. 18, 1995
Filed:
May. 07, 1993
Stanley E Fry, Riverside, CA (US);
Other;
Abstract
A valve for draining liquid from a pressurized gas system having a time-varying pressure comprises a housing defining an internal cavity communicating with (a) an inlet adapted to receive the time-varying pressure from the gas system, and (b) an outlet subject to ambient or subambient pressure. An inlet valve is movable in the housing between a first position that seals the inlet from the cavity and a second position that opens the inlet to the cavity in response to a predetermined pressure value. An outlet valve is movable in the housing between a first position that seals the outlet from the cavity and a second position that opens the cavity to the outlet. The inlet and outlet valves are biased so that the outlet valve is closed when the inlet valve is open, and the outlet valve is open for at least a substantial part of the time that the inlet valve is closed when the inlet pressure decreases below the predetermined value. In several embodiments, the inlet and outlet valves are separate valving elements that are movable axially relative to each other. In one embodiment, a single valving element has an upstream portion that serves as the inlet valve and a downstream portion that serves as the outlet valve, the outlet valving portion being open when the inlet valving portion is closed, and the outlet valving portion being closed when the inlet valving portion is open.