Low emission valve
US4537385A · kind A · utility
13Cited by
11References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1982 |
| Grant date | Aug 27, 1985 |
| Priority date | — |
| Expiry date | Oct 14, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8225
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A low emission valve assembly for use with volatile fluids and incorporating a pair of independent inner and outer metal bellows mechanical seal assemblies with means to compensate for thermal expansion of a liquid between the seals and which means transmits product pressure within the valve to the seals, so that the inner seal floats with a near zero pressure differential from outside to inside. The compensating means can be a pressure responsive bellows arrangement or a pressure response diaphragm arrangement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.