| 摘要 |
A hydraulic pressure control device includes a cylindrical valve body, at least one opening portion provided on the valve body, a spool valve disposed in the valve body and slidable along an inner surface of the valve body, at least one land portion provided at the spool valve and slidable along the inner surface of the valve body, and at least one recess provided at land portion of the spool valve wherein opening width of the recess continuously changes in sliding direction of the spool valve.
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