美国MAC电磁阀的蝶板安装于管道的直径方向。在美国MAC电磁阀阀体圆柱形通道内，圆盘形蝶板绕着轴线旋转，旋转角度为0°-90°之间，旋转到90°时，阀门则处于全开状态。
美国MAC电磁阀结构简单、体积小、重量轻，只由少数几个零件组成。而且只需旋转90°即可快速启闭，操作简单，同时该阀门具有良好的流体控制特性。蝶阀处于完全开启位置时，蝶板厚度是介质流经阀体时的阻力，因此通过该阀门所产生的压力降很小，故具有较好的流量控制特性。
美国MAC电磁阀有弹密封和金属的密封两种密封型式。弹性密封阀门，密封圈可以镶嵌在阀体上或附在蝶板周边。
采用金属密封的阀门一般比弹性密封的阀门寿命长，但很难做到完全密封。金属密封能适应较高的工作温度，弹性密封则具有受温度限制的缺陷。
如果要求蝶阀作为流量控制使用，主要的是正确选择阀门的尺寸和类型。蝶阀的结构原理尤其适合制作大口径阀门。蝶阀不仅在石油、煤气、化工、水处理等一般工业上得到广泛应用，而且还应用于热电站的冷却水系统。
常用的美国MAC电磁阀是用双头螺栓将阀门连接在两管道法兰之间，法兰式蝶阀是阀门上带有法兰，用螺栓将阀门上两端法兰连接在管道法兰上。
其手柄、手轮的大小是按正常人为设计的。因此，在阀门使用上规定：不答应操作者借助杠杆和长扳手启、闭阀门。同时手柄长度、手轮直径小于320mm的，只答应一个人操作；直径等于或超过320mm的手轮，答应两人共同操作，或者答应一人借助适当的杠杆（一般长度不超过0.5m）操作。但隔膜阀、非金属阀门是严禁使用杠杆或长扳手操作的，也不答应用过大、过猛的力关闭阀门。
有的操作者习惯使用杠杆和长扳手操作手动阀门，认为关闭力越大越好，其实不然。这样会造成阀门过早损坏，甚至酿成事故。实践证实：除撞击式手轮外，过大过猛地操作阀门轻易损坏手轮、手柄，擦伤阀杆和密封面，甚至压坏密封面。其次，手轮、手柄损坏或丢失后，应及时配齐，不答应用活扳手代用。
美国MAC电磁阀之类的阀门，关闭或开启到头（即下死点或上死点）时要回转1/4——1/2圈，使螺纹更好密合，以有利操作时检查，以免拧得过紧损坏阀门。
较大口径的美国MAC电磁阀和截止阀，有的设有旁通阀。旁通阀的作用是平衡进出口压差，减少开启力矩。开启时，应先打开旁通阀，然后再开启大阀门。
开启蒸汽阀门前必须先将管道预热，排出凝聚水。开启时要缓慢，以免产生水锤现象，损坏阀门和设备。开闭球阀、蝶阀、旋塞阀时，当阀杆顶面的沟槽与通道平行时，表明阀门的全开启位置；当阀杆向左或向右旋90度时，沟槽与通道垂直时，表明阀门在全关闭位置。有美国MAC电磁阀以扳手与通道平行为开启，垂直为关闭。三通、四通阀门的操作应按开启、关闭、换向的标记进行，操作完毕后应取下活动手柄。
对有标心的美国MAC电磁阀应检查调整好全开或全闭的指示位置。明杆闸阀、截止阀也应雇它们全开和全闭的位置，这样可以避免全开时顶死点。阀门全闭时，可借助标尺和记号发现关闭件脱落或顶住异物，以便排除故障。
新安装的管道和设备，内面脏物、焊碴等物较多。常开手动阀门密封面上轻易粘有脏物，应用微开方法，让高速介质冲走这些异物，再轻轻关闭。有的手动阀门在关闭后，温度下降，阀件收缩，使密封面产生细小缝隙，出现泄漏。这样应在关闭后，在适当时间再关一次。阀门操作正确与否，直接影响阀门的使用寿命。
MAC电磁阀型号：
MAC电磁阀3-ACA-DDAA-1BA,
MAC电磁阀3-ACA-DABA-1BA
MAC电磁阀3-ACA-DDBA-1BA,
MAC电磁阀3-ACA-DDFA-1BA
MAC电磁阀3-AA1-DDFJ-1JM,
MAC电磁阀3-ACA-DDFJ-1KA
MAC电磁阀3-SAC-DACA-1BA,
MAC电磁阀3-AAA-DACA-1BA
MAC电磁阀3-ACA-DDAJ-1JB,
MAC电磁阀3-SCC-DDAA-1BA
MAC电磁阀3-AAA-DDCA-1BK,
MAC电磁阀3-AAA-DAAA-1CA
MAC电磁阀3-AAA-DAAA-1BA,
MAC电磁阀3-B00-DABJ-1FM,
MAC电磁阀3-SAC-DAAA-1BA,
MAC电磁阀3-SCC-DABA-1BA
MAC电磁阀3-AAA-DACA-2BA,
MAC电磁阀3-AAA-DDCC-1BK,
MAC电磁阀3-AA1-DDFJ-1JB,
MAC电磁阀3-ACA-DBFA-1BA
MAC电磁阀3-ACA-DBAA-EBA,
MAC电磁阀3-ACA-DCAA-1BA,
MAC电磁阀3-ACA-DEFJ-1JJ,
MAC电磁阀3-AAA-DFFA-1BA
MAC电磁阀3-SLL-0GAA-EDA,
MAC电磁阀3-AAA-DDAJ-1JD,
MAC电磁阀3-AAA-DDAJ-1KD,
MAC电磁阀3-ACA-DDAA-1AB
MAC电磁阀3-AAB-DDAA-1BA,
MAC电磁阀3-AAA-DDAJ-1JD,
MAC电磁阀3-AAA-DABA-1BA,
MAC电磁阀3-AAA-DAAA-1BA,
MAC电磁阀3-BAA-DAAA-1BA,
MAC电磁阀3-BCB-DABB-2KA,
MAC电磁阀3-EDC-DACC-3KD,
MAC电磁阀3-SED-DFBH-4JB,
MAC电磁阀3-TOE-DDAJ-1JD,
MAC电磁阀3-AAF-DDBA-2BA,
MAC电磁阀3-BCO-DDFB-3KA,
MAC电磁阀3-EDA-DAAC-4KD,
MAC电磁阀3-SEB-DABH-1JB,
MAC电磁阀3-TOC-DACJ-2JD,
MAC电磁阀3-AAD-DFBA-2BA,
MAC电磁阀3-BCE-DDAB-3KA,
MAC电磁阀3-EDF-DDBC-4KD,
MAC电磁阀3-SEO-DDFH-1JB,
MAC电磁阀3-TOA-DAAJ-2JD,
MAC电磁阀3-AAB-DABA-3BA,
MAC电磁阀3-BCC-DACB-4KA,
MAC电磁阀3-EDD-DFBC-1KD,
MAC电磁阀3-SEE-DDAH-2JB,
MAC电磁阀3-TOF-DDBJ-3JD,
MAC电磁阀3-B00-DDBB-1BK,
MAC电磁阀3-B00-DDEJ-1TJ,
MAC电磁阀3-SAC-DDAA-1BA,
MAC电磁阀3-SCC-DAAA-1BA,
MAC电磁阀3-SCC-DDAJ-1KA ,
MAC电磁阀4-BC1-DDAA-1BA,
MAC电磁阀4-AA1-DDFA-1BA
MAC电磁阀4-AC1-DDAA-1BA,
MAC电磁阀4-AA1-DDAA-1CM
MAC电磁阀4-BC1-DABA-1BA,
MAC电磁阀4-SA2-DACA-1BA
MAC电磁阀4-SC1-DDAA-1BA,
MAC电磁阀4-AA1-DDFJ-1JB,
MAC电磁阀4-AC1-DDNA-1BA,
MAC电磁阀4-AC1-DDNA-THA,
MAC电磁阀4-AC1-DDNA-1BA,
MAC电磁阀4-SE2-DABA-1BA,
MAC电磁阀4-AA1-DDAJ-1KJ,
MAC电磁阀4-AA1-DDAJ-0KA,
MAC电磁阀4-AA1-DDAJ-0KA,
MAC电磁阀4-AA1-DDAJ-1KJ,
MAC电磁阀4-AC1-DACA-1BA,
MAC电磁阀4-SA1-DACC-1BA,
MAC电磁阀4-FA2-DABA-2CM,
MAC电磁阀4-AA1-DDFA-1DA,
MAC电磁阀4-AA1-DDAJ-1KD,
MAC电磁阀4-BC1-DDFJ-1KD,
MAC电磁阀4-BC1-DAAJ-1KA,
MAC电磁阀4-SC2-DAAJ-1KF,
MAC电磁阀4-GC1-DDAA-1BA,
MAC电磁阀4-AA1-DACC-1BA,
MAC电磁阀4-BC1-DEFJ-1JM,
MAC电磁阀4-SC1-DABA-1BA
MAC电磁阀4-SC2-DDFJ-4KD,
MAC电磁阀4-SC2-DDVD-1BA,
MAC电磁阀4-EA1-DDAA-1BA,
MAC电磁阀4-SA1-DACA-1BA
MAC电磁阀4-AA1-DDFA-1DA,
MAC电磁阀4-AA1-DDBA-1BA,
MAC电磁阀4-BC1-DDFA-1BA-CLSF,
MAC电磁阀4-AA1-DDAA-1BA,
MAC电磁阀4-SA1-DAAA-1BA,
MAC电磁阀4-FA1-DACA-1BA,
MAC电磁阀4-LAA-DFFJ-3KD,
MAC电磁阀4-AA1-DDFA-1JB,
MAC电磁阀4-AA1-BDFJ-1JB,
MAC电磁阀4-BC1-DEFJ-1BA,
MAC电磁阀4-BC1-EDFJ-1JM,
MAC电磁阀4-GC1-DAAA-1BA,
MAC电磁阀4-GC1-DAAJ-1KA,
MAC电磁阀4-GC1-DABC-1BA,
MAC电磁阀4-SA1-DACA-1BA,
MAC电磁阀34B-AAB-GDNB-1BE,
MAC电磁阀34B-ABA-GDFA-1KA
MAC电磁阀34B-AAA-GDKA-3BA,
MAC电磁阀34B-ABB-GDFA-1BA,
MAC电磁阀34B-AAA-GDDO-1KJ9,
MAC电磁阀34B-ABA-GDFA-1BA,
MAC电磁阀34B-ABA-GDFA-1BA,
MAC电磁阀34B-AAA-GDFA-1KV,
MAC电磁阀34B-AAA-GDFA-1BA,
MAC电磁阀34B-AAA-GDFA-1KV,
MAC电磁阀34B-NOO-GDNC-1KT 2,
MAC电磁阀34C-AAA-GAAA-1KA,
MAC电磁阀34C-BBB-GHCB-1KT,
MAC电磁阀34C-LOO-GDCC-1BA,
MAC电磁阀34B-LOO-GDFA-1BA,
MAC电磁阀34C-NAA-GDDH-1BT,
MAC电磁阀34C-LOO-GDFA-1KU,
MAC电磁阀34C-AAA-GDFA-2KA,
MAC电磁阀34C-BBB-GDNB-2KT
MAC电磁阀34C-LOO-GAAC-2BA,
MAC电磁阀34C-NAA-GHCB-2BT,
MAC电磁阀34C-AAA-GDCC-2HB
MAC电磁阀225B-501BA,
MAC电磁阀225B-611BA,
MAC电磁阀225B-121CAAA
MAC电磁阀225B-121BA,
MAC电磁阀225B-761JJ,
MAC电磁阀225B-121BA
MAC电磁阀225B-121CA,
MAC电磁阀225B-111CAAA,
MAC电磁阀225B-121AA
MAC电磁阀225B-781NAAA,
MAC电磁阀225B-121JA,
MAC电磁阀225B-510JC,
MAC电磁阀225B-611C
MAC电磁阀225B-110JB,
MAC电磁阀225B-120JB,
MAC电磁阀225B-220JB,
MAC电磁阀225B-590JB,
MAC电磁阀225B-610JB,
MAC电磁阀225B-870JB,
MAC电磁阀225B-111JB,
MAC电磁阀225B-122JB,
MAC电磁阀225B-221JB,
MAC电磁阀225B-592JB,
MAC电磁阀225B-611JB,
MAC电磁阀225B-872JB,
MAC电磁阀225B-110JD,
MAC电磁阀225B-120JA,
MAC电磁阀225B-220JC,
MAC电磁阀225B-590BA,
MAC电磁阀225B-610EA,
MAC电磁阀225B-870JD,
MAC电磁阀225B-111JA,
MAC电磁阀225B-122JC,
MAC电磁阀225B-221BA,
MAC电磁阀225B-592EA,
MAC电磁阀225B-611JD,
MAC电磁阀225B-872JA,
MAC电磁阀265B-110JB,
MAC电磁阀275B-120JB,
MAC电磁阀285B-220JB,
MAC电磁阀265B-590JB,
MAC电磁阀275B-610JB,
MAC电磁阀285B-870JB,
MAC电磁阀265B-111JB,
MAC电磁阀275B-122JB,
MAC电磁阀285B-221JB,
MAC电磁阀265B-592JB,
MAC电磁阀275B-611JB,
MAC电磁阀285B-872JB,
MAC电磁阀265B-110JD,
MAC电磁阀275B-120JA,
MAC电磁阀285B-220JC,
MAC电磁阀265B-590BA,
MAC电磁阀275B-610EA,
MAC电磁阀285B-870JD,
MAC电磁阀265B-111JA,
MAC电磁阀275B-122JC,
MAC电磁阀285B-221BA,
MAC电磁阀265B-592EA,
MAC电磁阀275B-611JD,
MAC电磁阀285B-872JA,
MAC电磁阀220B-110JB,
MAC电磁阀224B-120JB,
MAC电磁阀226B-220JB,
MAC电磁阀227B-590JB,
MAC电磁阀228B-610JB,
MAC电磁阀229B-870JB,
MAC电磁阀220B-111JB,
MAC电磁阀224B-122JB,
MAC电磁阀226B-221JB,
MAC电磁阀227B-592JB,
MAC电磁阀228B-611JB,
MAC电磁阀229B-872JB,
MAC电磁阀224B-110JD,
MAC电磁阀226B-120JA,
MAC电磁阀227B-220JC,
MAC电磁阀228B-590BA,
MAC电磁阀229B-610EA,
MAC电磁阀224B-870JD,
MAC电磁阀226B-111JA,
MAC电磁阀227B-122JC,
MAC电磁阀228B-221BA,
MAC电磁阀229B-592EA,
MAC电磁阀220B-611JD,
MAC电磁阀224B-872JA,
MAC电磁阀250B-111CAAA,
MAC电磁阀250B-111JA,
MAC电磁阀250B-501JA,
MAC电磁阀250B-611CAAA,
MAC电磁阀256B-110JB,
MAC电磁阀257B-120JB,
MAC电磁阀258B-220JB,
MAC电磁阀259B-590JB,
MAC电磁阀250B-610JB,
MAC电磁阀254B-870JB,
MAC电磁阀256B-111JB,
MAC电磁阀257B-122JB,
MAC电磁阀258B-221JB,
MAC电磁阀259B-592JB,
MAC电磁阀256B-611JB,
MAC电磁阀257B-872JB,
MAC电磁阀258B-110JD,
MAC电磁阀259B-120JA,
MAC电磁阀250B-220JC,
MAC电磁阀254B-590BA,
MAC电磁阀256B-610EA,
MAC电磁阀257B-870JD,
MAC电磁阀258B-111JA,
MAC电磁阀259B-122JC,
MAC电磁阀250B-221BA,
MAC电磁阀254B-592EA,
MAC电磁阀256B-611JD,
MAC电磁阀257B-872JA,
MAC电磁阀268B-110JB,
MAC电磁阀279B-120JB,
MAC电磁阀286B-220JB,
MAC电磁阀267B-590JB,
MAC电磁阀278B-610JB,
MAC电磁阀289B-870JB,
MAC电磁阀269B-111JB,
MAC电磁阀278B-122JB,
MAC电磁阀287B-221JB,
MAC电磁阀264B-592JB,
MAC电磁阀270B-611JB,
MAC电磁阀280B-872JB,
MAC电磁阀264B-110JD,
MAC电磁阀276B-120JA,
MAC电磁阀287B-220JC,
MAC电磁阀268B-590BA,
MAC电磁阀279B-610EA,
MAC电磁阀280B-870JD,
MAC电磁阀264B-111JA,
MAC电磁阀276B-122JC,
MAC电磁阀287B-221BA,
MAC电磁阀268B-592EA,
MAC电磁阀279B-611JD,
MAC电磁阀280B-872JA,
MAC电磁阀161B-501JB,
MAC电磁阀130B-111JA,
MAC电磁阀161B-501JB
MAC电磁阀117B-501BAAA,
MAC电磁阀117B-111BAAA,
MAC电磁阀111B-871JB,
MAC电磁阀111B-291JA
MAC电磁阀166B-611BA,
MAC电磁阀166B-611JM,
MAC电磁阀130B-612JA,
MAC电磁阀116B-591B-AAA,
MAC电磁阀116B-611JB,
MAC电磁阀111B-503JD,
MAC电磁阀111B-611JB ,
MAC电磁阀111B-611JB,
MAC电磁阀111B-511JM,
MAC电磁阀111B-121CAAA,
MAC电磁阀111B-511JB,
MAC电磁阀111B-511JA,
MAC电磁阀111B-611JM,
MAC电磁阀11B-6115M,
MAC电磁阀111B-G115M,
MAC电磁阀111B-221JB,
MAC电磁阀111B-111AA,
MAC电磁阀116B-501BAAA,
MAC电磁阀116B-121JB,
MAC电磁阀116B-611JM,
MAC电磁阀116B-611BA,
MAC电磁阀117B-871JB,
MAC电磁阀117B-121JD,
MAC电磁阀117B-121DAAA,
MAC电磁阀117B-291VAA,
MAC电磁阀121B-111BA,
MAC电磁阀121B-121BA,
MAC电磁阀121B-501BA,
MAC电磁阀121B-551BA,
MAC电磁阀121B-611BA,
MAC电磁阀121B-871BA,
MAC电磁阀121B-111JA,
MAC电磁阀121B-121JB,
MAC电磁阀121B-501JC,
MAC电磁阀121B-551JD,
MAC电磁阀121B-611JA,
MAC电磁阀121B-871JB,
MAC电磁阀111B-111BA,
MAC电磁阀131B-121BA,
MAC电磁阀141B-501BA,
MAC电磁阀161B-551BA,
MAC电磁阀171B-611BA,
MAC电磁阀181B-871BA,
MAC电磁阀122B-111JA,
MAC电磁阀120B-121JB,
MAC电磁阀122B-111BA,
MAC电磁阀123B-121BA,
MAC电磁阀124B-501BA,
MAC电磁阀125B-551BA,
MAC电磁阀126B-611BA,
MAC电磁阀127B-871BA,
MAC电磁阀128B-111JA,
MAC电磁阀129B-121JB,
MAC电磁阀122B-501JC,
MAC电磁阀123B-551JD,
MAC电磁阀124B-611JA,
MAC电磁阀125B-871JB,
MAC电磁阀116B-111BA,
MAC电磁阀137B-121BA,
MAC电磁阀148B-501BA,
MAC电磁阀169B-551BA,
MAC电磁阀172B-611BA,
MAC电磁阀180B-871BA,
MAC电磁阀123B-111JA,
MAC电磁阀124B-121JB,
MAC电磁阀123B-111BA,
MAC电磁阀124B-121BA,
MAC电磁阀125B-501BA,
MAC电磁阀126B-551BA,
MAC电磁阀127B-611BA,
MAC电磁阀128B-871BA,
MAC电磁阀113B-111JA,
MAC电磁阀123B-121JB,
MAC电磁阀133B-501JC,
MAC电磁阀145B-551JD,
MAC电磁阀166B-611JA,
MAC电磁阀177B-871JB,
MAC电磁阀187B-111BA,
MAC电磁阀128B-121BA,
MAC电磁阀138B-501BA,
MAC电磁阀147B-551BA,
MAC电磁阀167B-611BA,
MAC电磁阀176B-871BA,
MAC电磁阀185B-111JA,
MAC电磁阀125B-121JB,
MAC电磁阀134B-111BA,
MAC电磁阀143B-121BA,
MAC电磁阀152B-501BA,
MAC电磁阀162B-551BA,
MAC电磁阀173B-611BA,
MAC电磁阀184B-871BA,
MAC电磁阀175B-111JA,
MAC电磁阀166B-121JB,
MAC电磁阀147B-501JC,
MAC电磁阀137B-551JD,
MAC电磁阀128B-611JA,
MAC电磁阀139B-871JB,
MAC电磁阀143B-111BA,
MAC电磁阀166B-121BA,
MAC电磁阀175B-501BA,
MAC电磁阀185B-551BA,
MAC电磁阀129B-611BA,
MAC电磁阀130B-112JA,
MAC电磁阀166B-611JB,
MAC电磁阀161B-611JD,
MAC电磁阀161B-611JD
MAC电磁阀130B-292JA,
MAC电磁阀166B-611JA,
MAC电磁阀1668-611,
MAC电磁阀33A-AAB-RDFA-1TB,
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MAC电磁阀33A-LAB-RDFC-2DA
MAC电磁阀33A-MAB-RDGP-0DB,
MAC电磁阀33A-AOB-RDMA-1TB,
MAC电磁阀33A-BOB-RDAA-0BA
MAC电磁阀33A-LOB-RDBB-1BB,
MAC电磁阀33A-MOB-RDFC-2DB,
MAC电磁阀33A-LOB-RDBB-1BB
MAC电磁阀34C-L00-GDFA-1BA
MAC电磁阀34B-L00-GDFA-1BA
MAC电磁阀3-ACA-DDAA-1BA
MAC电磁阀55B-14-PE-501BA
MAC电磁阀36A-ACA-JDAA-1BA,
MAC电磁阀36A-AZA-EAAA-EJT,
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MAC电磁阀57D-53-RA,
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MAC电磁阀57D-82-RA,
MAC电磁阀58D-64-501JA,
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MAC电磁阀55B-12-PI-121JA,
MAC电磁阀55B-14-PI-611JJ 4,
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MAC电磁阀811C-PM-611JC-1524,
MAC电磁阀916B-PM-611JB,
MAC电磁阀811C-PM-591BA-155,
MAC电磁阀811C-PM-111DA-143,
MAC电磁阀811C-PM-121BA-155,
MAC电磁阀811C-PM-501CA-152,
MAC电磁阀914B-PM-121JD,
MAC电磁阀916B-PM-611JB+PME-
MAC电磁阀611JB 6511B-222-PM-501DA9,
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MAC电磁阀44B-ABA-GDFA-1KA,
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MAC电磁阀6211C-251-PM-11DA,
MAC电磁阀6311D-112-DM-111DA,
MAC电磁阀811C-PM-611CA-152,
MAC电磁阀811C-PM-611BA-126,
MAC电磁阀44B-ABA-GDCA-1BC,
MAC电磁阀6311D-351-PM-111DA,
MAC电磁阀6521B-010-PM-111DA,
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MAC电磁阀6211C-211-PM-501DA,
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MAC电磁阀6311D-351-PM-501DA,
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MAC电磁阀6521B-213-PM-111DA,
MAC电磁阀56C-18-611JA,
MAC电磁阀811C-PM-111DA-143,
MAC电磁阀811C-PM-611BA-152,
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……
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