Z2S22A-30B/，Z2S22B-30B/，REXROT保压阀

Z2S型单向阀是叠加式液控单向阀，它可用干关闭一个或两个工作油口，无泄漏持续时间长，稳定性好。油液从A到A1或B到B1自由流通，反向则被截止。如果油流通过阀。例如从A到A1，压力油作用在阀芯上，阀芯则向右运动并推动钢球离开阀座。单向阀被控制油打开时，油可从B1到B流通，压力在B1腔卸荷。单向阀全部开启，为保证两个主单向阀在换向中位时能可靠的关闭，阀的A，B口与回油路连接。

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