Double poppet valve with removable shear fitting
US5244006A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 17, 1992 |
| Grant date | Sep 14, 1993 |
| Priority date | — |
| Expiry date | Mar 17, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1789
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A shut off valve, of the type having a normally open main valve that closes in response to a shear force of greater than a predetermined magnitude, and a normally closed secondary valve that opens in response to a predetermined fluid pressure, wherein the main valve is contained in a first sub-housing and the secondary valve is contained in a separate second sub-housing, downstream from the first sub-housing. A hollow, tubular shear fitting, having an annular shear groove, has an upstream end removably coupled to the downstream end of the first sub-housing, and a downstream end removably coupled to the upstream end of the second sub-housing, where by the first sub-housing, the shear fitting, and the second sub-housing are axially aligned so that they define a continuous internal flow passage from the upstream end of the first sub-housing to the downstream end of the second sub-housing. When the shear fitting fractures at the shear groove in response to a shear force, the fragmented shear fitting can be removed from the sub-housings and replaced, without replacing the sub-housings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.