The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 1996
Filed:
Jul. 07, 1994
Harald Krause, Grevenbroich, DE;
Pierburg GmbH, Neuss, DE;
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.