How to properly adjust the electric device of the valve

In industrial enterprises, especially in urban water supply systems, a wide range of valves such as gate valves, butterfly valves, and liquid control butterfly valves are used to regulate the flow of tap water. These valves play a critical role in ensuring continuous and safe water supply. Among them, gate valves are particularly common. This article will focus on how to properly adjust the electric device of an electric gate valve, which is essential for its smooth operation and long-term performance. An electric gate valve consists of a gate valve combined with an electric actuator. It can be operated either locally or remotely. The electric actuator includes components like an electric motor, speed reducer, torque limiting mechanism, stroke control mechanism, manual-electric conversion system, opening indicator, and an electric controller. Improper adjustment of the electric actuator can lead to shortened service life, mechanical failure, or even serious accidents like motor burnout or damage to the valve housing. Therefore, it is crucial to carefully adjust the electric actuator to ensure reliable and safe operation. There are two main methods for adjusting the electric actuator of an electric gate valve: 1. **Adjusting the Torque Limiting Mechanism** The torque limiting mechanism should be adjusted based on the pressure difference at both ends of the gate valve. For example, if the pressure is low, the torque should be set lower. If the pressure is high, the torque should be increased accordingly. Different series of actuators, such as HZ, Z, ZB, and ZD, have similar adjustment procedures. For the ZD series, you need to remove the side cover, loosen the set screw, adjust the nut, and align the set screw with the groove on the shaft before tightening it again. This ensures that the torque limiting mechanism operates correctly and protects the valve from damage in case of a failure. 2. **Adjusting the "On" and "Off" Positions** To adjust the fully open and fully closed positions, first manually close or open the valve to the desired position. Then, power on the actuator and test the direction of rotation. If the motor rotates in the correct direction, adjust the stroke control mechanism to match the fully closed or fully open position. For example, if the valve stem pitch is 8mm and the gate needs to move 500mm, it requires 62.5 turns. Adjust the micro-switch accordingly to ensure accurate positioning. After adjustment, regular maintenance is important. Check the set screws of the torque limiting mechanism once a year to ensure they are secure. If loose, tighten them immediately. Also, ensure that the manual-electric conversion handle moves smoothly and that the power is disconnected when using manual mode. Valves that are rarely used should be periodically opened and closed to maintain their functionality. In recent years, frequency conversion technology has become popular for regulating pump flow, helping to save energy and improve efficiency. It is recommended to use this method instead of adjusting the valve directly, which can cause wear and tear on the sealing surfaces. Overall, proper adjustment and maintenance of the electric actuator are vital for the efficient and safe operation of electric gate valves in water supply systems.

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