| 摘要 |
A relief valve includes a valving element, a movable holder, a housing having a guide hole and a valve seat, and a resilient member. The valving element is lifted from its seated state, in which the valving element is engaged with the valve seat, toward a pressurizing chamber in a lift period. The lift period includes a lift first period and a lift second period. An amount of the lift of the valving element reaches a set distance in the lift first period. The lift second period is after the amount of the lift of the valving element has reached the set distance. The movable holder slides inside the guide hole both in the lift first period and in the lift second period. A minimum clearance area between the movable holder and the guide hole is larger in the lift second period than in the lift first period.
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