美國(guó)mac電磁閥的蝶板安裝于管道的直徑方向。在美國(guó)mac電磁閥閥體圓柱形通道內(nèi)，圓盤形蝶板繞著軸線旋轉(zhuǎn)，旋轉(zhuǎn)角度為0°-90°之間，旋轉(zhuǎn)到90°時(shí)，閥門則處于全開狀態(tài)。
美國(guó)mac電磁閥結(jié)構(gòu)簡(jiǎn)單、體積小、重量輕，只由少數(shù)幾個(gè)零件組成。而且只需旋轉(zhuǎn)90°即可快速啟閉，操作簡(jiǎn)單，同時(shí)該閥門具有良好的流體控制特性。蝶閥處于*開啟位置時(shí)，蝶板厚度是介質(zhì)流經(jīng)閥體時(shí)的阻力，因此通過該閥門所產(chǎn)生的壓力降很小，故具有較好的流量控制特性。
美國(guó)mac電磁閥有彈密封和金屬的密封兩種密封型式。彈性密封閥門，密封圈可以鑲嵌在閥體上或附在蝶板周邊。
采用金屬密封的閥門一般比彈性密封的閥門壽命長(zhǎng)，但很難做到*密封。金屬密封能適應(yīng)較高的工作溫度，彈性密封則具有受溫度限制的缺陷。
如果要求蝶閥作為流量控制使用，主要的是正確選擇閥門的尺寸和類型。蝶閥的結(jié)構(gòu)原理尤其適合制作大口徑閥門。蝶閥不僅在石油、煤氣、化工、水處理等一般工業(yè)上得到廣泛應(yīng)用，而且還應(yīng)用于熱電站的冷卻水系統(tǒng)。
常用的美國(guó)mac電磁閥是用雙頭螺栓將閥門連接在兩管道法蘭之間，法蘭式蝶閥是閥門上帶有法蘭，用螺栓將閥門上兩端法蘭連接在管道法蘭上。
其手柄、手輪的大小是按正常人為設(shè)計(jì)的。因此，在閥門使用上規(guī)定：不答應(yīng)操作者借助杠桿和長(zhǎng)扳手啟、閉閥門。同時(shí)手柄長(zhǎng)度、手輪直徑小于320mm的，只答應(yīng)一個(gè)人操作；直徑等于或超過320mm的手輪，答應(yīng)兩人共同操作，或者答應(yīng)一人借助適當(dāng)?shù)母軛U（一般長(zhǎng)度不超過0.5m）操作。但隔膜閥、非金屬閥門是嚴(yán)禁使用杠桿或長(zhǎng)扳手操作的，也不答應(yīng)用過大、過猛的力關(guān)閉閥門。
有的操作者習(xí)慣使用杠桿和長(zhǎng)扳手操作手動(dòng)閥門，認(rèn)為關(guān)閉力越大越好，其實(shí)不然。這樣會(huì)造成閥門過早損壞，甚至釀成事故。實(shí)踐證實(shí)：除撞擊式手輪外，過大過猛地操作閥門輕易損壞手輪、手柄，擦傷閥桿和密封面，甚至壓壞密封面。其次，手輪、手柄損壞或丟失后，應(yīng)及時(shí)配齊，不答應(yīng)用活扳手代用。
美國(guó)mac電磁閥之類的閥門，關(guān)閉或開啟到頭（即下死點(diǎn)或上死點(diǎn)）時(shí)要回轉(zhuǎn)1/4——1/2圈，使螺紋更好密合，以有利操作時(shí)檢查，以免擰得過緊損壞閥門。
較大口徑的美國(guó)mac電磁閥和截止閥，有的設(shè)有旁通閥。旁通閥的作用是平衡進(jìn)出口壓差，減少開啟力矩。開啟時(shí)，應(yīng)先打開旁通閥，然后再開啟大閥門。
開啟蒸汽閥門前必須先將管道預(yù)熱，排出凝聚水。開啟時(shí)要緩慢，以免產(chǎn)生水錘現(xiàn)象，損壞閥門和設(shè)備。開閉球閥、蝶閥、旋塞閥時(shí)，當(dāng)閥桿頂面的溝槽與通道平行時(shí)，表明閥門的全開啟位置；當(dāng)閥桿向左或向右旋90度時(shí)，溝槽與通道垂直時(shí)，表明閥門在全關(guān)閉位置。有美國(guó)mac電磁閥以扳手與通道平行為開啟，垂直為關(guān)閉。三通、四通閥門的操作應(yīng)按開啟、關(guān)閉、換向的標(biāo)記進(jìn)行，操作完畢后應(yīng)取下活動(dòng)手柄。
對(duì)有標(biāo)心的美國(guó)mac電磁閥應(yīng)檢查調(diào)整好全開或全閉的指示位置。明桿閘閥、截止閥也應(yīng)雇它們?nèi)_和全閉的位置，這樣可以避免全開時(shí)頂死點(diǎn)。閥門全閉時(shí)，可借助標(biāo)尺和記號(hào)發(fā)現(xiàn)關(guān)閉件脫落或頂住異物，以便排除故障。
新安裝的管道和設(shè)備，內(nèi)面臟物、焊碴等物較多。常開手動(dòng)閥門密封面上輕易粘有臟物，應(yīng)用微開方法，讓高速介質(zhì)沖走這些異物，再輕輕關(guān)閉。有的手動(dòng)閥門在關(guān)閉后，溫度下降，閥件收縮，使密封面產(chǎn)生細(xì)小縫隙，出現(xiàn)泄漏。這樣應(yīng)在關(guān)閉后，在適當(dāng)時(shí)間再關(guān)一次。閥門操作正確與否，直接影響閥門的使用壽命。
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mac電磁閥121b-501jc,
mac電磁閥121b-551jd,
mac電磁閥121b-611ja,
mac電磁閥121b-871jb,
mac電磁閥111b-111ba,
mac電磁閥131b-121ba,
mac電磁閥141b-501ba,
mac電磁閥161b-551ba,
mac電磁閥171b-611ba,
mac電磁閥181b-871ba,
mac電磁閥122b-111ja,
mac電磁閥120b-121jb,
mac電磁閥122b-111ba,
mac電磁閥123b-121ba,
mac電磁閥124b-501ba,
mac電磁閥125b-551ba,
mac電磁閥126b-611ba,
mac電磁閥127b-871ba,
mac電磁閥128b-111ja,
mac電磁閥129b-121jb,
mac電磁閥122b-501jc,
mac電磁閥123b-551jd,
mac電磁閥124b-611ja,
mac電磁閥125b-871jb,
mac電磁閥116b-111ba,
mac電磁閥137b-121ba,
mac電磁閥148b-501ba,
mac電磁閥169b-551ba,
mac電磁閥172b-611ba,
mac電磁閥180b-871ba,
mac電磁閥123b-111ja,
mac電磁閥124b-121jb,
mac電磁閥123b-111ba,
mac電磁閥124b-121ba,
mac電磁閥125b-501ba,
mac電磁閥126b-551ba,
mac電磁閥127b-611ba,
mac電磁閥128b-871ba,
mac電磁閥113b-111ja,
mac電磁閥123b-121jb,
mac電磁閥133b-501jc,
mac電磁閥145b-551jd,
mac電磁閥166b-611ja,
mac電磁閥177b-871jb,
mac電磁閥187b-111ba,
mac電磁閥128b-121ba,
mac電磁閥138b-501ba,
mac電磁閥147b-551ba,
mac電磁閥167b-611ba,
mac電磁閥176b-871ba,
mac電磁閥185b-111ja,
mac電磁閥125b-121jb,
mac電磁閥134b-111ba,
mac電磁閥143b-121ba,
mac電磁閥152b-501ba,
mac電磁閥162b-551ba,
mac電磁閥173b-611ba,
mac電磁閥184b-871ba,
mac電磁閥175b-111ja,
mac電磁閥166b-121jb,
mac電磁閥147b-501jc,
mac電磁閥137b-551jd,
mac電磁閥128b-611ja,
mac電磁閥139b-871jb,
mac電磁閥143b-111ba,
mac電磁閥166b-121ba,
mac電磁閥175b-501ba,
mac電磁閥185b-551ba,
mac電磁閥129b-611ba,
mac電磁閥130b-112ja,
mac電磁閥166b-611jb,
mac電磁閥161b-611jd,
mac電磁閥161b-611jd
mac電磁閥130b-292ja,
mac電磁閥166b-611ja,
mac電磁閥1668-611,
mac電磁閥33a-aab-rdfa-1tb,
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mac電磁閥33a-mab-rdgp-0db,
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mac電磁閥33a-lob-rdbb-1bb,
mac電磁閥33a-mob-rdfc-2db,
mac電磁閥33a-lob-rdbb-1bb
mac電磁閥34c-l00-gdfa-1ba
mac電磁閥34b-l00-gdfa-1ba
mac電磁閥3-aca-ddaa-1ba
mac電磁閥55b-14-pe-501ba
mac電磁閥36a-aca-jdaa-1ba,
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mac電磁閥57d-53-ra,
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mac電磁閥52a-11-coa-dm-ddfj-1jb,
mac電磁閥52a-11-doa-dm-dddj-4kd,
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mac電磁閥52a-11-dob,
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mac電磁閥52a-14-dob-dm-ddaj-1kf
mac電磁閥55b-12-pi-121ja,
mac電磁閥55b-14-pi-611jj 4,
mac電磁閥55b-11-po-111ca,
mac電磁閥55b-14-p1-501ba,
mac電磁閥55b-12-pi-121ca,
mac電磁閥55b-12-pi-121ca
mac電磁閥55b-14-pz-501ba,
mac電磁閥55b-11-p1-111aa
mac電磁閥57d-32-611ca,
mac電磁閥57d-51-ra,
mac電磁閥57d-52-ra,
mac電磁閥58d-76-111ja,
mac電磁閥58c-18-501ba,
mac電磁閥58c-43-11ca,
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mac電磁閥58d-36-111ja,
mac電磁閥58d-74g-501ja,
mac電磁閥58c-12-111aa,
mac電磁閥82a-ac-bka-tm-ddap-1da 3,
mac電磁閥92b-aah-bja-dm-djbp-1dg 2,
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mac電磁閥92b-aab-had-dm-ddap-1dn,
mac電磁閥92b-aba-ooo-dm-ddap-1dm,
mac電磁閥811c-pm-111ca-155,
mac電磁閥811c-pm-611jc-1524,
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mac電磁閥811c-pm-111da-143,
mac電磁閥811c-pm-121ba-155,
mac電磁閥811c-pm-501ca-152,
mac電磁閥914b-pm-121jd,
mac電磁閥916b-pm-611jb+pme-
mac電磁閥611jb 6511b-222-pm-501da9,
mac電磁閥6511b-252-pm-871da
mac電磁閥6521b-313-pm-111da,
mac電磁閥6321d-513-pm-111d,
mac電磁閥56c-63-121jb,
mac電磁閥544b-aba-gdfa-1ka,
mac電磁閥44b-aba-gdfa-1ka,
mac電磁閥411a-d0a-dm-ddaa-1ba,
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mac電磁閥6211c-251-pm-11da,
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mac電磁閥811c-pm-611ca-152,
mac電磁閥811c-pm-611ba-126,
mac電磁閥44b-aba-gdca-1bc,
mac電磁閥6311d-351-pm-111da,
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mac電磁閥411a-b0a-bm-ddfz-ekz,
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mac電磁閥6211c-000-pm-111da,
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……
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