| 摘要 |
A four-way valve assembly provided with a housing having an elongate bore in which a single shiftable valve is slidably disposed. Electric solenoids are connected to opposite ends of the housing for effecting shifting of the valve between opposite ends positions. A pair of sleevelike liners are disposed in the bore, and an inlet port communicates with the bore between adjacent inner ends of the liners. A pair of load ports communicate with the bore through the individual liners and are spaced axially on opposite sides of the inlet port. A pair of exhaust ports communicate with the bore adjacent opposite ends thereof in axially outwardly spaced relationship relative to the load ports. The valve has an elastic valve ring mounted centrally of the rodlike stem and disposed to axially shift between and sealingly coact with valve seats formed on opposed inner ends of the liners. The stem also has radially enlarged cylindrical guide portions disposed in axially spaced relationship on opposite sides of the valve ring. The guide portions slidably engage the inner wall of the liners for maintaining the valve in centered alignment solely by positional engagement with the liners.
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