Digitally controllable flow rate valve
US5887847A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 18, 1997 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Sep 18, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D16/2095
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A digitally controllable valve has a main valve member mounted on a diaphragm for movement sealing and exposing a main valve seat. A flow restriction on the main valve member varies the flow rate as a function of displacement of the main valve member from the main valve seat. Pressure in a reservoir above the diaphragm is controlled by two pilot valves respectively connected to the inlet and outlet ports of the main valve, one of which has fluid passageway with a larger minimum cross sectional area than the other. Both pilots communicate with the reservoir through a single common bleed opening which has an area less than the minimum cross sectional areas of pilot valve flow passageways.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.