| 摘要 |
A means at a fork-lift truck for adjustment of the idle operation. A valve ball 28 provides a reversed pressure relief operation for providing the idle operation. The force at which the idle operation is operated is adjustable by a screw 32, having a conical portion 34, cooperating with a adjustment ball 33. A spring is adapted between the balls 28 and 33. The force required for moving the ball 28 against the valve seat 35 thereof is adjustable by the screw 32 . |
