Electromagnetic reversing valve
US5503185A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 7, 1994 |
| Grant date | Apr 2, 1996 |
| Priority date | — |
| Expiry date | Jul 7, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86622
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An electromagnetic reversing valve in which a slidable armature is supported with clearance in a housing and carries a plastic seal unit for selectively closing first and second channels in the housing upon sliding movement of the armature, the sealing unit provides a separate fluid passage establishing communication between a third channel in the housing and one of the first and second channels when it is unsealed. Since the clearance space around the slidable armature is separate and independent from the fluid passage in the seal unit, it can be made substantially narrower in dimension than the fluid passage, thereby to minimize the iron-free gap between the slidable armature and the surrounding member of the magnetic circuit. The iron-free gap is formed in part by the clearance space and in part by a portion of the housing in which the magnetic circuit member is embedded. In a particular embodiment, the seal unit is formed by a central part joined to an outer part by radial, circumferentially spaced ribs defining the fluid passage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.