原理：它是一种直动和先导式相结合的原理，当入口与出口没有压差时，通电后，电磁力直接把先导小阀和主阀关闭件依次向上提起，阀门打开。当入口与出口达到启动压差时，通电后，电磁力先导小阀，主阀下腔压力上升，上腔压力下降，从而利用压差把主阀向上推开；断电时，先导阀利用弹簧力或介质压力推动关闭件，向下移动，使阀门关闭。 特点：在零压差或真空、高压时亦能可*动作，但功率较大，要求必须水平安装。 先导式电磁阀 原理：通电时，电磁力把先导孔打开，上腔室压力迅速下降，在关 闭件周围形成上低下高的压差，流体压力推动关闭件向上移动，阀门打开；断电时，弹簧力把先导孔关闭，入口压力通过旁通孔迅速腔室在关阀件周围形成下低上高的压差，流体压力推动关闭件向下移动，关闭阀门。 特点：流体压力范围上限较高，可任意安装（需定制）但必须满足流体压差条件。 2、电磁阀从阀结构和材料上的不同与原理上的区别，分为六个分支小类：直动膜片结构、分步直动膜片结构、先导膜片结构、直动活塞结构、分步直动活塞结构、先导活塞结构。 3、电磁阀按照功能分类：水用电磁阀、蒸汽电磁阀、制冷电磁阀、低温电磁阀、燃气电磁阀、消防电磁阀、氨用电磁阀、气体电磁阀、液体电磁阀、微型电磁阀、脉冲电磁阀、液压电磁阀 常开电磁阀、油用AS32601A-M29-G220 AS32061A-M29-R23 MVSPM22-350 MVSPM22-350 PI35V-G24 MQPPM22-30G24 MQPPM22-30G24-A1 SD6201D20-AA BKSPM22-32 BVKPM22-160 AS3406-G24 AM3406-G24 AM22060B-G24 AS32060B-G24 BVDPM22-350 AS22061A-G12 AS22061A-G12 AM22061A AS22101A AM22102A AS22061A AS32060B SD6302D20-AA AS4306-G24 AS3406-G24 AS3406-G24 AM3406-G24 AM22060B-G24 AS32060B-G24 AS22061A-G24 AS32060B-G24 AS430B-G24 AS32061A-G24 AS22101A-G24 AS22101A-G12 AS22101A-R230 AS4306-G24 AS22061A-G24 AS32060B-R230 MVSPM22-160 SDSPM22-AB-G24/KD35 SIN60V-G24 SIN45V-G24 PI45V-G24 MVPPM22-200-G24 AEXD22061A-G24/12 SDSPM22-BA-G24/KD35 BKDPM22-32 RBSG1012 BPWS4D41-04-K1-G24-D1 SDSPM18-BA-G24/kD35 APWS4D101-50-G24 WDPFA06-ACB-S-5-G24 AS4306-G24 WDPFA06-ACB-161-G24 MVSPM22-160 PI35MV-G24 SDSPM18-BA-R230/MD35 BVSPM18-350 ADRVDN6/31.5 BSSPM18-63 APC32061a-V3 DNSPM18-0.32 AH22061a AH32101A-D1 AH4D101A/R-D1 SDSPM22-AB-G24 BASPM22-350 AH4D103a/r SVYPM33-DC-G24/L12 ZS22101AB-G24-H20 ZM22101AB-G24-H20 SIN60V-G24 BH22041A PI45V-G24 SIN45V-G24 AMW4D62-G24 SVSPM33-DC-G24/KD35 AMW4Z60B-G24/HB6 RNXPM33-5-D1 AVPW4D101-80-TI-G24/D25-D1K1 WDPFA06-ACB-S-32-D1K1-G24 BPWS4D41-K1-G24/OS-D1 BSSPM18-160 MVSPM22-160 MVSPM18-160 MVPFA04-P/A-100-G24 AS3406-G24 MVPPM22-200-G24 MVPPM22-200-G25 MDPPM16-20-G24 MVPPM18-20-G24 ZS22061AB-G24 AH32101A-DA AH4D101A/R-D1 WDExdllC06-AB1-G24/L12 AS22061A-G24 MVPFA04-P/A-100-G24 BDKPM22-32 BM4Z40A-G24 BVSPM22-160 BVSPM22-160 MQCPM22-XXX-S1788-G24/T4 MVPPM22-100-G24 MVSPPM22-160 QASPM18-5 QSPPM33-80-G24 QZDPM22-16 SDSPM18-AB-G24/MD35 SDSPM18-BA-G24/MD35 MDBPM16-25-G12 MDBPM16-25-G24 MDBPM16-40-G12 MDBPM16-40-G24 MDIPM16-25-G12/WD MDIPM16-25-G24/WD MDIPM16-40-G12/WD MDIPM16-40-G24/WD MDPPM16-40-G12/WD MDPPM16-40-G24/WD MGPPM16-100-G12/WD MGPPM16-100-G24/WD MGBPM16-100-G12/L15 MGBPM16-100-G24/L15 MVPPM18-20-G12 MVPPM18-100-G12 MVPPM18-200-G12 MVPPM18-315-G12 MVPPM18-20-G24 MVPPM18-100-G24 MVPPM18-200-G24 MVPPM18-315-G24 MVPPM22-20-G12/WD MVPPM22-63-G12/WD MVPPM22-100-G12/WD MVPPM22-160-G12/WD MVPPM22-200-G12/WD MVPPM22-275-G12/WD MVPPM22-350-G12/WD MVPPM22-20-G24/WD MVPPM22-63-G24/WD MVPPM22-100-G24/WD MVPPM22-160-G24/WD MVPPM22-200-G24/WD MVPPM22-275-G24/WD MVPPM22-350-G24/WD MVPPM22-20-G12 MVPPM22-63-G12 MVPPM22-100-G12 MVPPM22-160-G12 MVPPM22-200-G12 MVPPM22-250-G12 MVPPM22-350-G12 MVPPM22-20-G24 MVPPM22-63-G24 MVPPM22-100-G24 MVPPM22-160-G24 MVPPM22-200-G24 MVPPM22-250-G24 MVPPM22-250-G24-M35/55 +手动控制HB替代 MVPPM22-250-G24-HB4.5M35/55 MVPPM22-350-G24 MVVPMA1 MVVPMA1 MVVPMA1 MVVPMA1 MVVPMA1 MVVPMA1 MVVPMA1 MVVPMA1 MVVPMA1 MVVPMA1 MVVPMA1 MVVPMA1 MVVPMA1 MVVPMA1 MVPPM22-20-G12/MEA1 MVPPM22-63-G12/MEA1 MVPPM22-100-G12/MEA1 MVPPM22-160-G12/MEA1 MVPPM22-200-G12/MEA1 MVPPM22-275-G12/MEA1 MVPPM22-350-G12/MEA1 MVPPM22-20-G24/MEA1 MVPPM22-63-G24/MEA1 MVPPM22-100-G24/MEA1 MVPPM22-160-G24/MEA1 MVPPM22-200-G24/MEA1 MVPPM22-275-G24/MEA1 MVPPM22-350-G24/MEA1