Pneumatic time delay valve
US3990516A · kind A · utility
5Cited by
5References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1975 |
| Grant date | Nov 9, 1976 |
| Priority date | — |
| Expiry date | Oct 8, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87265
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A valve body contains a coaxially slidably valve element with a seal member at the upstream end and a pair of differential area pistons at the other end. Fluid passage means direct fluid from the upstream end to a zone between the pistons to cause the pistons to seat the seal member. An orifice in the downstream, larger area piston bleeds fluid to an accumulator of preselected volume. Once the pressure forces on the large piston balance, the pressure force on the small piston unseat the seal member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.