1.工作可靠性
指电磁铁通电后能否可靠地换向，而断电后能否可靠地复位。电磁阀也只有在一定的流量和压力范围内才能正常工作。这个工作范围的极限称为换向界限。
2.压力损失
由于电磁阀的开口很小，故液流流过阀口时产生较大的压力损失。
3.内泄漏量
在各个不同的工作位置，在规定的工作压力下，从高压腔漏到低压腔的泄漏量为内泄漏量。过大的内泄漏量不仅会降低系统的效率，引起过热，而且还会影响执行机构的正常工作。
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