比如进出口压差P1-P3增大，则通过感压膜和弹簧的作用使自动平衡阀组关小，使P1-P2增大，从而维持P2-P3的恒定;反之P1-P3减小，则自动平衡阀组开大，使P1-P2减小，从而维持P2-P3的恒定。既在管网压
AH22061a
AH32101A-D1
AH4D101A/R-D1
SDSPM22-AB-G24
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SVYPM33-DC-G24/L12