电动阀通常由电动执行机构和阀门连接起来，经过安装调试后成为电动阀。电动阀使用电能作为动力来接通电动执行机构驱动阀门，实现阀门的开关、调节动作。从而达到对管道介质的开关或是调节目的。
电磁阀是电动阀的一个种类；是利用电磁线圈产生的磁场来拉动阀芯，从而改变阀体的通断，线圈断电，阀芯就依靠弹簧的压力退回。
日常电动阀门维护保养
1、电动阀门应 存干燥通风的室内，通路两端须堵塞。
2、长期存放的电动阀门应定期检查，清除污物，并在加工面上涂防锈油。
3、安装后，应定期进行检查，主要检查项目：
（1）密封面磨损情况。
（2）阀杆和阀杆螺母的梯形螺纹磨损情况。
（3）填料是否过时失效，如有损坏应及时更换。
（4）电动阀门检修装配后，应进行密封性能试验。
运行中的电动阀门，各种阀件应齐 全、完好。法兰和支架上的螺栓不可缺少，螺纹应完好无损，不允许有松动现象。手轮上的紧固螺母，如发现松动应及时拧紧，以免磨损连接处或丢失手轮和铭牌。手轮如有丢失，不允许用活扳手代替 ，应及时配齐。填料压盖不允许歪斜或无预紧间隙。对容易受到雨雪、灰尘、风沙等污物沾染的环境中的电动阀门，其阀杆要安装保护罩。电动阀门上的标尺应保持完整、准确、清晰。电动阀门的铅封 、盖帽、气动附件等应齐全完好。保温夹套应无凹陷、裂纹。
不允许在运行中的电动阀门上敲打、站人或支承重物；特别是非金属电动阀门和铸铁电动阀门，更要禁止。
Electric valve operating principle and maintenance
Electric valve is usually connected by electric actuator and valve, after installation and debugging become electric valve. The electric valve uses electric energy as the power to connect the electric actuator to drive the valve, and realize the switch and adjustment of the valve. So as to achieve the pipe medium switch or regulation purpose.
Solenoid valve is a type of electric valve; The magnetic field generated by the electromagnetic coil is used to pull the spool, so as to change the opening and closing of the valve body, and the coil is powered off. The spool relies on the pressure of the spring to return.
Daily maintenance of electric valve
1, the electric valve should be stored in a dry and ventilated room, both ends of the pathway must be blocked.
2, long-term storage of the electric valve should be regularly checked, remove dirt, and rust prevention oil on the processing surface.
3. After installation, regular inspection should be carried out. The main inspection items are:
(1) Sealing surface wear.
(2) trapezoidal thread wear of stem and stem nut.
(3) whether the packing is outdated and invalid, if damaged, it should be replaced in time.
(4) After inspection and assembly of electric valve, sealing performance test should be carried out.
Electric valve in operation, all kinds of valve parts should be complete and intact. The bolts on the flange and bracket are indispensable, and the threads should be intact without loosening. If the fastening nut on the handwheel is found loose, tighten it in time to avoid wear at the connection or loss of the handwheel and nameplate. If the hand wheel is lost, it is not allowed to use a live wrench to replace it. It should be assembled in time. Packing gland is not allowed to skew or have no preload clearance. The valve stem should be equipped with a protective cover for the electric valve in the environment that is susceptible to rain, snow, dust, sand and other dirt. The ruler on the electric valve should be kept complete, accurate and clear. The lead seal, cap and pneumatic accessories of the electric valve should be complete and intact. Thermal insulation jacket should be free of depressions and cracks.
Do not beat, stand or support heavy objects on the electric valve in operation; In particular, non-metallic electric valves and cast iron electric valves should be prohibited.
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