作滯后大，靈敏度降低，增加了動態壓力超調量，且易堵塞、工藝性也不好
C1——主閥口的流量系數（無因次），圖2結構可取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、主閥芯導向長度l
增大主閥芯導向長度l，有利主閥芯工作穩定，減少嘯叫和壓力振擺，但過大，結構尺寸增加.建議l1.2D
7、導閥芯半錐
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