Pressure range delimited valve
US7331392B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 2005 |
| Grant date | Feb 19, 2008 |
| Priority date | — |
| Expiry date | Feb 10, 2026 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A differential pressure valve has a valve body containing a main piston axially moveable therein to open a fluid inlet to a fluid outlet at preset high pressure and to close at a preset lower pressure. A high pressure trigger piston and a low pressure trigger piston are operable in the main piston to alternately engage and lock the main piston to the valve body in one of the closed and open positions. A ball shifts in a port in the main piston to alternately straddle between at least one annular locking groove in the valve body and a release recess in a respective trigger piston. The ball can shift to alternately reside to straddle the valve body and main piston in the locked position or to straddle the main piston and trigger piston in the unlocked position. The trigger pistons and main pistons are mechanically biased to urge the pistons against the fluid pressure at the inlet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.