SMC電磁閥VX3334K-03-5G工作原理；
1.1質(zhì)氣，液態(tài)或混合狀態(tài)分別選用不同品種的電磁閥，例ZQDF用于空氣，ZQDF—Y用于液體， ZQDF—2（或-3）用于蒸汽，否則易引起誤動作。ZDF系列多功能電磁閥則可通通于氣.液體。訂時告明介質(zhì)狀態(tài)，安裝用戶就不必再調(diào)式。
1.2介質(zhì)溫度不同規(guī)格產(chǎn)品，否則線圈會燒掉，密封件老化，嚴重影響壽命命。
1.3介質(zhì)粘度，通常在50cSt以下。若超過此值，通徑大于15mm用ZDF系列多功能電磁閥作特殊訂貨。通徑小于15mm訂高粘度電磁閥。

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1.4介質(zhì)清潔度不高時都應在電磁閥前配裝反沖過濾閥，壓力低時尚可選用直動膜片式電磁閥作例如CD—P。
1.5介質(zhì)若是定向流通，且不允許倒流ZDF—N和ZQDF—N單需用雙向流通，請作特殊要求提出。
1.6介質(zhì)溫度應選在電磁閥允許范圍之內(nèi)。
2.管道參數(shù)
2.1根據(jù)介質(zhì)流向要求及管道連接方式選擇閥門通口及型號。例如，用于一條管道向兩條管道切換的，小通徑的選CA5和Z3F，中等或大通徑請選ZDF—Z1/2。又如控制兩條管道匯流的，請選ZDF—Z2/1等。
2.2根據(jù)流量和閥門Kv值選定公稱通徑，也可選同管道內(nèi)徑。請注意有的廠家未標有Kv值，往往閥孔尺寸小于接口管徑，切不可貪圖價低而誤事。
2.3工作壓差
zui低工作壓差在0.04Mpa以上是可選用間接先導式；zui低工作壓差接近或小于零的必須選用直動式或分步直接式。

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3.環(huán)境條件
3.1環(huán)境的zui高和zui低溫度應選在允許范圍之內(nèi)，如有超差需作特殊訂貨提出。
3.2環(huán)境中相對濕度高及有水滴雨淋等場合，應選防水電磁閥
3.3環(huán)境中經(jīng)常有振動，顛簸和沖擊等場合應選特殊品種，例如船用電磁閥。
3.4在有腐蝕性或爆炸性環(huán)境中的使用應優(yōu)先根據(jù)安全性要求選用耐發(fā)蝕
3.5環(huán)境空間若受限制，請選用多功能電磁閥，因其省去了旁路及三只手動閥且便于在線維修。
4.電源條件
4. 1根據(jù)供電電源種類，分別選用交流和直流電磁閥。一般來說交流電源取用方便。
4.2電壓規(guī)格用盡量優(yōu)先選用AC220V.DC24V。
4.3電源電壓波動通常交流選用+%10%.-15%，直流允許±%10左右，如若超差，須采取穩(wěn)壓措施或提出特殊訂貨要求。

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4.4應根據(jù)電源容量選擇額定電流和消耗功率。須注意交流起動時VA值較高，在容量不足時應優(yōu)先選用間接導式電磁閥。
5.控制精度
5.1普通電磁閥只有開、關兩個位置，在控制精度要求高和參數(shù)要求平穩(wěn)時請選用多位電磁閥；Z3CF三位常開電磁閥，具有微啟，全開和關閉三種流量；
ZDF－Z1/1組合多功能電磁閥具有全開、大開、小開、全開四種流量。
5.2動作時間：指電信號接通或切斷至主閥動作完成時間，只有本公司產(chǎn)品多功能電磁閥可對開啟和關閉時間分別調(diào)節(jié)，不僅可滿足控制精度要求，還可防止水錘破壞。
5.3泄漏量
樣本上給出的泄漏量數(shù)值為常用經(jīng)濟等級，若嫌偏高，請作特殊訂貨。
二、安全性：
1、腐蝕性介質(zhì)：宜選用塑料王電磁閥和全不銹鋼；對于強腐蝕的介質(zhì)必須選用隔離膜片式。例CD-F. Z3CF。中性介質(zhì)，也宜選用銅合金為閥殼材料的電磁閥，否則，閥殼中常有銹屑脫落，尤其是動作不頻繁的場合。氨用閥則不能采用銅材。
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