节流阀的性能要求是:
·流量调节范围大,流量一压差变化平滑;
·内泄漏量小,若有外泄漏油口,外泄漏量也要小;
·调节力矩小,动作灵敏。
节流阀(Choke valve)的外形结构与截止阀并无区别,只是它们启闭件的形状有所不同。
节流阀的启闭件大多为圆锥流线型,通过它改变通道截面积而达到调节流量和压力。节流阀供在压力降极大的情况下作降低介质压力之用。介质在节流阀瓣和阀座之间流速很大,以致使这些零件表面很快损坏-即所谓气蚀现象。为了尽量减少气蚀影响,阀瓣采用耐气蚀材料(合金钢制造)并制成顶jian角为140~180的流线型圆锥体这还能使阀瓣能有较大的开启高度,一般不推荐在小缝隙下节流。由于节流阀的流量不仅取决于节流口面积的大小,还与节流口前后的压差有关,阀的刚度小,
故只适用于执行元件负载变化很小且速度稳定性要求不高的场合。
EPC-130/10E0
EPC-131/10E0
EPC-134/10E0
导轨式
EPA-M110/20
EPA-M111/20
EPA-M114/20
EPA-M120/20
EPA-M121/20
EPA-M124/20
EPA-M224/20
EPA-M234/20
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