Low pressure shutoff valve for fluid operated tool
US4090688A · kind A · utility
3Cited by
5References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 21, 1976 |
| Grant date | May 23, 1978 |
| Priority date | — |
| Expiry date | Jul 21, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7733
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A low pressure shutoff valve adapted to be interposed in the fluid supply conduit of a fluid operated torque tool comprises a piston closure member having opposed differential pressure faces exposed to fluid supply pressure and a coil spring for biasing the piston toward a fluid shutoff position. The piston is disposed in a chamber which may be vented by actuating an axially slidable sleeve on the exterior of the valve body whereby the valve is opened to supply pressure fluid to the tool as long as the fluid pressure is greater than a predetermined minimum value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.