Pressure activated check valve
US4967791A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1989 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | Apr 26, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7876
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A pressure activated check valve comprising a valve body defining an axial fluid flow passage between inlet and outlet ports, a poppet valve assembly disposed in the passage for movement between an open position permitting two-way fluid flow through the passage and a closed position obstructing fluid flow through the passage, a spring for normally biasing the poppet valve assembly to the open position, a fluid pressure port adapted for fluid communication with a selectively pressured fluid source for selectively moving the poppet valve assembly to the closed position in opposition to the spring and elements responsive to fluid pressure in the inlet port for permitting fluid flow from the inlet port to the outlet port when the poppet valve assembly is in the closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.