Gate valve with internal pressure relief means
US4515174A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1983 |
| Grant date | May 7, 1985 |
| Priority date | — |
| Expiry date | Dec 27, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1812
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A valve (10) having an expansible gate assemblage of ported juxtaposed gate and segment members (18, 19) which are movable into sealing engagement with upstream and downstream valve seats (28) about the flow passage (12, 14) in the open and closed conditions of the valve wherein the valve includes pressure relief means which relieves excessive pressure in the valve chamber (11) into the upstream flow passage (12) when the environment in the chamber reaches a preselected temperature with the valve retaining capability of providing an upstream seal in the event of subsequent downstream leakage. The pressure relief means is installed in the segment member (19) of the gate assembly and comprises a passage (43) extending from the port (16) through the segment to the sealing face (25) of the segment member at a location which is exposed to the upstream flow passage (12) in the valve closed condition. The passage (43) includes an enlarged diameter section (44) which is normally plugged by a ball check valve element (42) seated against a shoulder (46) formed in the passage (43) and held thereagainst by a plug (41) of eutectic material and a retainer (47) with an aperture (48) therethrough.…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.