作滯后大，靈敏度降低，增加了動(dòng)態(tài)壓力超調(diào)量，且易堵塞、工藝性也不好
C1——主閥口的流量系數(shù)（無(wú)因次），圖2結(jié)構(gòu)可取C1=0.78
ρ―油液密度，取850－900kg/m3
Px―卸荷壓力，通常取Px=(0.2～0.5)MPa
6、主閥芯導(dǎo)向長(zhǎng)度l
增大主閥芯導(dǎo)向長(zhǎng)度l，有利主閥芯工作穩(wěn)定，減少?lài)[叫和壓力振擺，但過(guò)大，結(jié)構(gòu)尺寸增加.建議l1.2D
7、導(dǎo)閥芯半錐
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