1. How to switch between manual and electric valves

将手动电动连锁机构切换到手动侧，用手轮来操作电动阀门。在开、关过程中，操作应灵活轻便、无卡涩现象，同时还应检查开、关方向与电动装置是否一致， 开度指示器显示的数值应与手轮方向一致且同步。经过几次反复检查和调整之后，确认无误就可以将其放置在开启、关闭的中间位置，以便于电动操作。

Switch the manual electric interlock mechanism to the manual side, and use the hand wheel to operate the electric valve. In the process of opening and closing, the operation shall be flexible and light without jamming. At the same time, check whether the opening and closing directions are consistent with the electric device. The value displayed by the opening indicator shall be consistent with and synchronized with the direction of the handwheel. After repeated inspection and adjustment for several times, it can be placed in the middle of the opening and closing position to facilitate electric operation.

2、电动阀门为什么要有切换手柄

2. Why do electric valves have switching handles

手轮直接装在执行机构上故障率比较高。通电时电动执行机构在转动，手轮也在转动，这是多危险的事情。增加离合器就是为了保障操作的性，方便客户进行手自动切换操作。离合器也有助于与手轮连接部位的齿轮与内侧蜗杆齿轮的磨损程度。

The failure rate is high when the hand wheel is directly installed on the actuator. When the power is on, the electric actuator is rotating, and the hand wheel is also rotating. This is a dangerous thing. The clutch is added to ensure the safety of operation and facilitate the manual and automatic switching operation of customers. The clutch also contributes to the degree of wear of the gear at the connection with the handwheel and the inner worm gear.

3、电动阀门的执行器无法切换手动操作

3. Actuator of electric valve cannot be switched to manual operation

无法切换手动操作在设备正常运行时不会对系统产生影响，但是当电动操作出现故障或者设备检修时，该故障就会产生较大的影响，导致工作人员无法通过手动操作判断故障，或者是无法准确定位电动阀门的开关位。其产生的原因主要是切换机构离合器齿轮或者销轴损坏。

The failure to switch the manual operation will not affect the system during the normal operation of the equipment. However, when the electric operation fails or the equipment is overhauled, the fault will have a great impact, resulting in the staff unable to judge the fault through the manual operation, or unable to accurately determine the on-off position of the electric valve. The main reason is that the clutch gear or pin shaft of the switching mechanism is damaged.

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