美国MAC电磁阀里有密闭的腔，在不同位置开有通孔，每个孔连接不同的油管，腔中间是活塞，两面是两块电磁铁，哪面的磁铁线圈通电阀体就会被吸引到哪边，通过控制阀体的移动来开启或关闭不同的排油孔，而进油孔是常开的，液压油就会进入不同的排油管，然后通过油的压力来推动油缸的活塞，活塞又带动活塞杆，活塞杆带动机械装置。这样通过控制电磁铁的电流通断就控制了机械运动
美国MAC电磁阀45A-AA1-DDAJ-1KJ,45A-AC1-DACA-1BA,45A-SA1-DACC-1BA,
45A-FA2-DABA-2CM,45A-AA1-DDFA-1DA,45A-AA1-DDAJ-1KD,
45A-BC1-DDFJ-1KD,45A-BC1-DAAJ-1KA,45A-SC2-DAAJ-1KF,
45A-GC1-DDAA-1BA,45A-AA1-DACC-1BA,45A-BC1-DEFJ-1JM,45A-SC1-DABA-1BA
45A-SC2-DDFJ-4KD,45A-SC2-DDVD-1BA,45A-EA1-DDAA-1BA,45A-SA1-DACA-1BA
45A-AA1-DDFA-1DA,45A-AA1-DDBA-1BA,45A-BC1-DDFA-1BA-CLSF,45A-AA1-DDAA-1BA,
45A-SA1-DAAA-1BA,45A-FA1-DACA-1BA,45A-LAA-DFFJ-3KD,45A-AA1-DDFA-1JB,
45A-AA1-BDFJ-1JB,45A-BC1-DEFJ-1BA,45A-BC1-EDFJ-1JM,45A-GC1-DAAA-1BA,
45A-GC1-DAAJ-1KA,45A-GC1-DABC-1BA,45A-SA1-DACA-1BA,
34B-AAB-GDNB-1BE,34B-ABA-GDFA-1KA
34B-AAA-GDKA-3BA,34B-ABB-GDFA-1BA,
34B-AAA-GDDO-1KJ9,34B-ABA-GDFA-1BA,34B-ABA-GDFA-1BA,
34B-AAA-GDFA-1KV,34B-AAA-GDFA-1BA,34B-AAA-GDFA-1KV,
34B-NOO-GDNC-1KT 2,34C-AAA-GAAA-1KA,34C-BBB-GHCB-1KT,34C-LOO-GDCC-1BA,34B-LOO-GDFA-1BA,
34C-NAA-GDDH-1BT,34C-LOO-GDFA-1KU,34C-AAA-GDFA-2KA,34C-BBB-GDNB-2KT
34C-LOO-GAAC-2BA,34C-NAA-GHCB-2BT,34C-AAA-GDCC-2HB
225B-501BA,225B-611BA,225B-121CAAA
225B-121BA,225B-761JJ,225B-121BA
225B-121CA,225B-111CAAA,225B-121AA
225B-781NAAA,225B-121JA,225B-510JC,225B-611C
225B-110JB,225B-120JB,225B-220JB,225B-590JB,
225B-610JB,225B-870JB,225B-111JB,225B-122JB,
225B-221JB,225B-592JB,225B-611JB,225B-872JB,
225B-110JD,225B-120JA,225B-220JC,225B-590BA,
225B-610EA,225B-870JD,225B-111JA,225B-122JC,
MAC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、油用电磁阀、直流电磁阀、高压电磁阀、防爆电磁阀等。