4WRZ16E150-7X/6EG24N9K4/V力士乐比例阀

4WRZ16E150-7X/6EG24N9K4/V力士乐比例阀

4WRZ16E150-7X/6EG24N9K4/V

电磁比例换向阀（带反馈） 4WRE(E)...2X...
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4WRZ16E150-7X/6EG24N9K4/V

1、用于静密封时的密封原理

在静密封中以O形圈应用为广泛。如果设计、使用正确，O形密封圈在静密封中可以实现无泄漏的密封。

O形密封圈装入密封槽后，其截面承受接触压缩应力而产生弹性变形。

对接触面产生一定的初始接触压力Po。即使没有介质压力或者压力很小，O形密封圈靠自身的弹性力作用而也能实现密封;当容腔内充入有压力的介质后，在介质压力的作用下，O形密封圈发生位移，移向低压侧，同时其弹性变形进一步加大，填充和封闭间隙δ。此时，坐用于密封副偶合面的接触压力上升为Pm:

Pm=Po+Pp

式中Pp——经O形圈传给接触面的接触压力(0.1MPa)

Pp=K*P

K——压力传递系数，对于橡胶制O形密封圈K=1;

P——被密封液体的压力(0.1MPa)。

从而大大增加了密封效果。由于一般K≥1，所以Pm>P。由此可见，只要O形密封圈存在初始压力，就能实现无泄漏的密封。这种靠介质本身压力来改变O形密封圈接触状态，使之实现密封的性质，称为自封作用。
力士乐 比例阀 武汉现货
理论上，压缩变形即使为零，在油压力下也能密封，但实际上O形密封圈安装时可能会有偏心。所以，O形圈装入密封沟槽后，其断面一般受到7%—30%的压缩变形。静密封取较大的压缩率值，动密封取较小的压缩率值。这是因为合成橡胶在低温下要压缩，所以静密封O形圈的预压缩量应考虑补偿它的低温收缩量。

4WRZ16E150-7X/6EG24N9K4/V