美國MAC電磁閥里有密閉的腔，在不同位置開有通孔，每個孔連接不同的油管，腔中間是活塞，兩面是兩塊電磁鐵，哪面的磁鐵線圈通電閥體就會被吸引到哪邊，通過控制閥體的移動來開啟或關閉不同的排油孔，而進油孔是常開的，液壓油就會進入不同的排油管，然后通過油的壓力來推動油缸的活塞，活塞又帶動活塞桿，活塞桿帶動機械裝置。這樣通過控制電磁鐵的電流通斷就控制了機械運動
美國MAC電磁閥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電磁閥按照功能分類：水用電磁閥、蒸汽電磁閥、制冷電磁閥、低溫電磁閥、燃氣電磁閥、消防電磁閥、氨用電磁閥、氣體電磁閥、液體電磁閥、微型電磁閥、脈沖電磁閥、液壓電磁閥 常開電磁閥、油用電磁閥、直流電磁閥、高壓電磁閥、防爆電磁閥等。