Electromagnetic valve with a plug member comprising a permanent magnet
US4392632A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1981 |
| Grant date | Jul 12, 1983 |
| Priority date | — |
| Expiry date | Jul 2, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K31/082
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An axially magnetized cylindrical permanent magnet has a valve plug projection at one end for seating in a valve seat. It moves axially within a cavity, provided by two cup cores of ferromagnetic material, which is bisected by a medium ring that has an aperture allowing the permanent magnet to slide within it. Each cup core has a re-entrant central pole, one of which carries the valve seat and is bored to provide one valve port. Windings between the re-entrant poles and the core shells are concurrently energized in such a way as to produce like poles at the re-entrant pole faces, so that one will repel the permanent magnet and the other will attract it. A pulse of current is sufficient to open or close the valve and may be followed by a reverse pulse to brake the plug in order to reduce wear. The permanent magnet force holds the plug in either end positon when there is no current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.