Problems in the selection of electric actuators
The electric actuator is an indispensable device for realizing valve program control, automatic control and remote control. The movement process can be controlled by the stroke, torque or axial thrust. Since the operating characteristics and utilization 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 choice of electric actuators to prevent overloading (operating torque is higher than control) Torque) is crucial.
In general, the correct choice of electric actuators is based on the following:
Operating torque The operating torque is the most important parameter for selecting an electric actuator. The output torque of the electric device should be 1.2 to 1.5 times the maximum torque of the valve.
There are two types of mainframe structures for operating thrust electric actuators: one is to configure the thrust disc without directing the thrust disc; the other is to configure the thrust disc, and the output torque is converted into the output thrust through the stem nut in the thrust disc. Last year, the total import and export volume of the electric valve industry reached US$24.1 billion, a year-on-year increase of 28.2%. The total export value was US$22.4 billion, a year-on-year increase of 29.3%; the total import value was US$201.34 billion, a year-on-year increase of 27%. With the recovery of the world economy, the import and export of Wenzhou valve products has also increased. However, due to the large gap in high-end technology compared with foreign manufacturers, product technology will become a constraint on the development of Wenzhou electric valve products in the future. A bottleneck.
Electric actuators have special requirements that must be able to limit torque or axial forces. Usually electric actuators use a torque limiting coupling. When the specifications of the electric device are determined, the control torque is also determined.