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有些负荷较轻的变幅机构（工作压力ｐ＜１６ＭＰａ）采用节流阀控制变幅液压缸下降运动，用液控单向阀保持变幅液压缸的静态锁紧。此种方式具有油路简单、调速方便、变幅机构能以较理想的速度作下降运动等优点，因此获得应用。但这种方式，其通过节流阀的流量受到限制，也就是
Some light-weight luffing mechanism (working pressure p <16MPa) using throttles control luffing cylinder descending movement, with liquid-controlled one-way valve to maintain the luffing cylinder static locking. This method has the advantages of simple oil passage, convenient speed regulation, luffing mechanism capable of descending movement at an ideal speed, and is thus used. But this way, its flow through the throttle is limited, that is