Emergency pressure relief valve
US6209561A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2000 |
| Grant date | Apr 3, 2001 |
| Priority date | — |
| Expiry date | Feb 28, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7853
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An emergency pressure relief valve has a housing fluidly connected to a pressurized system line carrying a system fluid. The housing carries a piston and a valve member which move within the housing between a closed position and an open position. The piston defines an upper chamber and a lower chamber within the housing. A control fluid is supplied to the upper chamber, and the pressure of the control fluid exerts a biasing force to a first side of the piston. The biasing force holds the valve member and piston in a closed position when the pressure of the system fluid is at an acceptable level. As the pressure of the system fluid rises above the acceptable level, the valve member moves to an open position. While the piston moves from the closed position to the open position, a delay fluid is injected into the lower chamber. As the delay fluid is expelled from the chamber, it delays a return of the piston and valve member to the closed position. As the piston and valve member return from the open position to the closed position, the delay fluid in the lower chamber flows to the upper chamber through a check valve carried by the piston.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.