Differential pressure detection system for signaling electrically-activated valve
US5970797A · kind A · utility
Inventor
Key dates
| Filing date | Nov 4, 1998 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Nov 4, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H35/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A device and method for sensing a change in differential pressure within a fluid flow is disclosed. In one embodiment, a differential pressure is induced in a flow of fluid through a conduit between first and second axially spaced locations. One side of a diaphragm, piston, or other differential pressure movably responsive member in a differential pressure housing is exposed to the pressure of the flow at the first location, while its opposite side is exposed to the the pressure of the flow at the second location. A extension or the like engages the diaphragm on its high pressure side and passes out through a wall of the differential pressure housing where it is mechanically interconnected with a switch, which in turn is operatively interconnected with a valve in the conduit. Sufficient movement of the diaphragm due to certain change in the differential pressure between the two sides of the diaphragm will physically move the extension which is engaged therewith, which in turn will physically move the switch to a position where a signal is provided to valve to adjust the flow characteristics through the conduit. These movements may be used to identify an underflow condition where th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.