电磁阀选型首先应该依次遵循安全性，可靠性，适用性，经济性四大原则，其次是根据六个方面的现场工况（即管道参数、流体参数、压力参数、电气参数、动作方式、特殊要求进行选择）。
选型依据：
一、根据管道参数选择电磁阀的：通径规格（即DN）、接口方式
1、按照现场管道内径尺寸或流量要求来确定通径（DN）尺寸。
2、接口方式，一般>DN50要选择法兰接口，≤DN50则可根据用户需要自由选择。
二、根据流体参数选择电磁阀的：材质、温度组
1、腐蚀性流体：宜选用耐腐蚀电磁阀和全不锈钢；食用超净流体：宜选用食品级不锈钢材质电磁阀。
2、高温流体：要选择采用耐高温的电工材料和密封材料制造的电磁阀，而且要选择活塞式结构类型的。
3、流体状态：大至有气态，液态或混合状态，特别是口径大于DN25订货时一定要区分开来。
4、流体粘度：通常在50cSt以下可任意选择，若超过此值，则要选用高粘度电磁阀。
三、根据压力参数选择电磁阀的：
1、公称压力：这个参数与其它通用阀门的含义是一样的，是根据管道公称压力来定。
2、工作压力：如果工作压力低则必须选用直动或分步直动式原理；zui低工作压差在0.04Mpa以上时直动式、分步直动式、先导式均可选用。
四、电气选择：电压规格应尽量优先选用AC220V、DC24较为方便。
五、根据持续工作时间长短来选择：常闭、常开、或可持续通电
1、当电磁阀需要长时间开启，并且持续的时间多于关闭的时间应选用常开型。
2、要是开启的时间短或开和关的时间不多时，则选常闭型。
3、但是有些用于安全保护的工况，如炉、窑火焰监测，则不能选常开的，应选可长期通电型。
六、根据环境要求选择辅助功能：防爆、止回、手动、防水雾、水淋、潜水
太阳铁工电磁阀故障与排除：
一、电磁阀通电后不工作
检查电源接线是否不良→重新接线和接插件的连接
检查电源电压是否在±工作范围-→调致正常位置范围
线圈是否脱焊→重新焊接
线圈短路→更换线圈
工作压差是否不合适→调整压差→或更换相称的电磁阀
流体温度过高→更换相称的电磁阀
有杂质使电磁阀的主阀芯和动铁芯卡死→进行清洗，如有密封损坏应更换密封并安装过滤器
液体粘度太大，频率太高和寿命已到→更换产品
二、电磁阀不能关闭
主阀芯或铁动芯的密封件已损坏→更换密封件
流体温度、粘度是否过高→更换对口的电磁阀
有杂质进入电磁阀产阀芯或动铁芯→进行清洗
弹簧寿命已到或变形→更换
节流孔平衡孔堵塞→及时清洗
工作频率太高或寿命已到→改选产品或更新产品
三、其它情况
内泄漏→检查密封件是否损坏，弹簧是否装配不良
外泄漏→连接处松动或密封件已坏→紧螺丝或更换密封件
通电时有噪声→头子上坚固件松动，拧紧。电压波动不在允许范围内，调整好电压。铁芯吸合面杂质或不平，及时清洗或更换。
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