Four-way switching valve

Details Four-way switching valve Four-way switching valve

2005-03-01

2005-03-01

Michalsky, Gerald A. (Department: 3753)

Fluid handling

Systems

Multi-way valve unit

C137S596170

Reexamination Certificate

active

06860294

ABSTRACT:
To provide a four-way solenoid valve having a three-way solenoid valve of which non-concentricity between a valve element and a valve hole is small, if any. A core of a three-way solenoid is integrally formed with a refrigerant passage extending axially therethrough, an annular projection forming a valve seat, and a guide for guiding reciprocating motion of a needle forming a valve element. A plug closing a cylinder of a body to define the pressure control chamber is also integrally formed with a valve seat and a guide for guiding reciprocating motion of a needle forming a valve element associated with the valve seat. This causes the needles to be seated on the valve seats associated therewith in respective states guided by the guides substantially concentric with the valve holes, which makes it possible to impart sufficient sealing properties to the valve portions when each valve is closed.

REFERENCES:
patent: 2888039 (1959-05-01), Tilney
patent: 20030000586 (2003-01-01), Hirota et al.
patent: 20030159739 (2003-08-01), Hirota et al.
patent: 1 273 837 (2003-01-01), None
Abstract of Japanese Publication 2003-083458, Published Mar. 19, 2003.

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