SMC电磁阀VX3334K-03-5G工作原理；
1.1质气，液态或混合状态分别选用不同品种的电磁阀，例ZQDF用于空气，ZQDF—Y用于液体， ZQDF—2（或-3）用于蒸汽，否则易引起误动作。ZDF系列多功能电磁阀则可通通于气.液体。订时告明介质状态，安装用户就不必再调式。
1.2介质温度不同规格产品，否则线圈会烧掉，密封件老化，严重影响寿命命。
1.3介质粘度，通常在50cSt以下。若超过此值，通径大于15mm用ZDF系列多功能电磁阀作特殊订货。通径小于15mm订高粘度电磁阀。

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1.4介质清洁度不高时都应在电磁阀前配装反冲过滤阀，压力低时尚可选用直动膜片式电磁阀作例如CD—P。
1.5介质若是定向流通，且不允许倒流ZDF—N和ZQDF—N单需用双向流通，请作特殊要求提出。
1.6介质温度应选在电磁阀允许范围之内。
2.管道参数
2.1根据介质流向要求及管道连接方式选择阀门通口及型号。例如，用于一条管道向两条管道切换的，小通径的选CA5和Z3F，中等或大通径请选ZDF—Z1/2。又如控制两条管道汇流的，请选ZDF—Z2/1等。
2.2根据流量和阀门Kv值选定公称通径，也可选同管道内径。请注意有的厂家未标有Kv值，往往阀孔尺寸小于接口管径，切不可贪图价低而误事。
2.3工作压差
zui低工作压差在0.04Mpa以上是可选用间接先导式；zui低工作压差接近或小于零的必须选用直动式或分步直接式。

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3.环境条件
3.1环境的zui高和zui低温度应选在允许范围之内，如有超差需作特殊订货提出。
3.2环境中相对湿度高及有水滴雨淋等场合，应选防水电磁阀
3.3环境中经常有振动，颠簸和冲击等场合应选特殊品种，例如船用电磁阀。
3.4在有腐蚀性或爆炸性环境中的使用应优先根据安全性要求选用耐发蚀
3.5环境空间若受限制，请选用多功能电磁阀，因其省去了旁路及三只手动阀且便于在线维修。
4.电源条件
4. 1根据供电电源种类，分别选用交流和直流电磁阀。一般来说交流电源取用方便。
4.2电压规格用尽量优先选用AC220V.DC24V。
4.3电源电压波动通常交流选用+%10%.-15%，直流允许±%10左右，如若超差，须采取稳压措施或提出特殊订货要求。

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4.4应根据电源容量选择额定电流和消耗功率。须注意交流起动时VA值较高，在容量不足时应优先选用间接导式电磁阀。
5.控制精度
5.1普通电磁阀只有开、关两个位置，在控制精度要求高和参数要求平稳时请选用多位电磁阀；Z3CF三位常开电磁阀，具有微启，全开和关闭三种流量；
ZDF－Z1/1组合多功能电磁阀具有全开、大开、小开、全开四种流量。
5.2动作时间：指电信号接通或切断至主阀动作完成时间，只有本公司产品多功能电磁阀可对开启和关闭时间分别调节，不仅可满足控制精度要求，还可防止水锤破坏。
5.3泄漏量
样本上给出的泄漏量数值为常用经济等级，若嫌偏高，请作特殊订货。
二、安全性：
1、腐蚀性介质：宜选用塑料王电磁阀和全不锈钢；对于强腐蚀的介质必须选用隔离膜片式。例CD-F. Z3CF。中性介质，也宜选用铜合金为阀壳材料的电磁阀，否则，阀壳中常有锈屑脱落，尤其是动作不频繁的场合。氨用阀则不能采用铜材。
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