Pilot operated relief valve
US4679586A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1986 |
| Grant date | Jul 14, 1987 |
| Priority date | — |
| Expiry date | Apr 4, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7771
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A pilot operated relief valve is disclosed which includes a first control space operatively connected to the inlet fluid channel, and a second control space operatively connected to the outlet fluid channel. In one embodiment, each control space is connected to a relief outlet by means of an adjustable valve, whereby the valve is adapted to operate as a pressure relief valve in either flow direction. In another embodiment, one of the control spaces is connected to the opposite channel by means of a one-way check valve, so as to function as a makeup fluid supply valve upon the pressure in the opposite channel reaching a predetermined low level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.