Drain valve for pressurized gas system
US5433194A · kind A · utility
Inventor
Key dates
| Filing date | May 7, 1993 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | May 7, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16T1/14
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.