Pilot operated valve
US7147006B2 · kind B2 · utility
10Cited by
10References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 12, 2004 |
| Grant date | Dec 12, 2006 |
| Priority date | — |
| Expiry date | Apr 12, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87209
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A valve assembly having a fluid switch and a main valve for controlling fluid pressure in a working volume in three control states wherein the main valve has three ports for fluid, flow of fluid through a first port and a second port being controlled by the fluid switch being provided with an electrical signal in a first state or a second state respectively, and flow of fluid through the third port being controlled by alternating the signal, preferably rapidly, between the first and second states.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.