Double block valve with proving system
US6968851B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2002 |
| Grant date | Nov 29, 2005 |
| Priority date | — |
| Expiry date | Jan 10, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/88046
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A double block valve and a valve proving system are disclosed. The double block valve is actuated by a single actuator and includes a valve body housing a cavity. The cavity defines an upstream portion with a fluid inlet and a downstream portion with a fluid outlet. A seating assembly is interposed between the upstream and the downstream portions. A first and a second blocking element are disposed in the valve body and are both movable within the cavity between opened and closed positions. With the first and second blocking elements both contacting the seating assembly, the space therebetween defines an enclosed space with a finite volume. The proving system is used for two safety shut-off valves on a valve train, such as a double block valve. The proving system connects to an enclosed space established between the two safety shut-off valves and includes a pair of three-way valves, oppositely biased pressure switches, and a pump, all of which are interconnected through pneumatic conduits. The proving system uses pressure accumulation and timed decay to determine the integrity of the two safety shut-off valves of the valve train.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.