Issues that should be paid attention to when selecting electric actuators

The current distribution of the valve market is mainly based on the construction of engineering projects. The major users of valves are the petrochemical industry, power sector, metallurgical sector, chemical industry and urban construction sector. The petrochemical industry mainly uses API standard gate valves, stop valves and check valves; the power sector mainly uses high-temperature pressure gate valves, stop valves, check valves and safety valves for power stations and low-pressure butterfly valves and gate valves for some water supply and drainage valves; the chemical industry mainly uses stainless steel gate valves, stop valves and check valves; the metallurgical industry mainly uses low-pressure large-diameter butterfly valves and oxygen cut-off valves. valves and oxygen ball valves; urban construction departments mainly use low-pressure valves. For example, urban water pipes mainly use large-diameter gate valves, apartment construction mainly uses centerline butterfly valves, urban heating mainly uses metal-sealed butterfly valves; oil pipelines mainly use flat gate valves and ball valves; the pharmaceutical industry mainly uses stainless steel ball valves; the food industry mainly uses stainless steel ball valves, etc.

The electric actuator is an indispensable device for realizing valve program control, automatic control and remote control. Its movement process can be controlled by the stroke, torque or axial thrust. Since the working characteristics and utilization rate of electric actuators depend on the type of valve, the working specifications of the device and the position of the valve on the pipeline or equipment, the correct selection of electric actuators is very important to prevent overloading (the operating torque is higher than the control torque). Therefore, the correct selection of electric actuators is very important.

Generally, the correct selection of electric actuators is based on the following:
Operating torque Operating torque is the main parameter for selecting an electric actuator. The output torque of the electric device should be 1.2 to 1.5 times the maximum operating torque of the valve.
There are two host structures for operating thrust electric actuators: one is not equipped with a thrust plate and directly outputs torque; the other is equipped with a thrust plate and the output torque is converted into output thrust through the stem nut in the thrust plate. As the world economy picks up, the import and export of valve products have also increased.

Electric actuators have special requirements, that is, they must be able to limit torque or axial force. Usually electric actuators use couplings that limit torque. When the specifications of the electric device are determined, its control torque is also determined.