Pilot operated valve
US4669700A · kind A · utility
3Cited by
11References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 13, 1985 |
| Grant date | Jun 2, 1987 |
| Priority date | — |
| Expiry date | May 13, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D16/2095
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
To minimize friction losses and hysteresis losses while providing convenient adjustability without alignment problems in a pilot operated valve, a poppet is disposed between two ports in a valve body and is biased by means of a spaced diaphragm assembly. The poppet is axially positionable in the body in a nearly zero lapped position relative to the first and second ports. In cooperation with the diaphragm assembly, fluid pressure signals delivered to three separate chambers are utilized to control valve opening ramp rate, pressure variations within the limit of a set point, and adjustability of the set point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.