Fluid pressure control device
US4481969A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1983 |
| Grant date | Nov 13, 1984 |
| Priority date | — |
| Expiry date | Jun 6, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7808
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The safety device is disposable in the gas line connecting between a gas source under pressure and a tapping device installed in a keg. The safety device includes a valve housing carrying a spring biased, axially movable piston assembly including a valve body and an axially movable stem element. Upon an increase in gas line pressure above a predetermined pressure, the gas acts on the piston assembly to displace it as a unit in an upstream direction against the bias of the spring to seal the stem against a primary valve seat element and preclude further ingress of gas into the keg. However, should the primary valve seat element leak, due to wear or contamination, causing pressure within the system to increase, the valve body will move relative to the valve stem to vent the housing to atmosphere and to close a secondary valve seat adapted to positively prevent further fluid flow downstream of the device toward the keg.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.