| 摘要 |
PURPOSE: A control method and valve forms a pilot passage inside to control a valve internally to provide stable hydraulic pressure and secure valve installation space. CONSTITUTION: A valve comprises a valve body(60), a sleeve(74) and a valve spool. The valve body(60) has ports(66, 68, 70) communicated with multiple lines. The sleeve(74) is placed in a bore part(64) of the valve body(60) has multiple penetrating holes(72) communicated with the ports(66, 68, 70) and a passage groove(76) formed on the periphery thereof communicating one of the penetrating holes(72) with an end part thereof. The valve spool is built in the sleeve(74) to move horizontally by hydraulic pressure supplied and selectively opens the ports(66, 68, 70) to control hydraulic pressure.
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