在更高的负荷段，由于高、中 压调门已经全开，汽机升负荷只能靠过载阀（over load valve，OLV）来升负荷，这样降低了机组在高负 荷阶段一次调频响应的速度。
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Whereas clause, the structure of valve had been improved, holding valve and over load valve had been added in it. The problem had been resolved by means of above.
基于以上现象，对控制支腿缸的换向阀结构进行了改进，通过在原有换向阀的基础上增加一过载阀及4个单向阀解决了上述问题。
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