So how can we choose a suitable electric device? Let's take a look from the perspective of electric device sales. What parameters do we need to determine which electric actuator the customer needs?
Of course, the simple thing is that the customer directly provides the model of the electric actuator, which is easy to determine, but there is a problem. There are many models of electric actuators on the market, which also causes some troubles for the comparison between products.
If there is no electric actuator model, then the following steps have to be taken:
One, determine the type of electric device
Electric actuators are generally divided into four categories: multi-turn electric devices, part-turn electric devices, linear electric actuators, and quarter-turn electric actuators. This is distinguished according to the operating mode of the electric actuator. Because the operation mode of the valve or similar equipment determines the operation mode of the electric actuator.
For example, gate valves, globe valves, etc. require multiple turns to open or close the valve, so they are multi-turn valves, and a multi-turn electric device is required to match this type of valve.
For example, butterfly valves, ball valves, etc. only need to rotate 90° to open or close the valve, so they are part-turn valves and need to be equipped with part-turn electric devices.
For example, single-seat valves, double-seat valves, sleeve valves, etc. are straight-stroke valves, that is, valves that generally reciprocate in a straight line (including moving in a spiral manner), and need to be equipped with a straight-stroke electric actuator.
For example, baffle doors, gates, etc. have fixed rotating shafts and need to be rotated from 0° to 90°, which requires rotary electric actuators.
Although there are many operating forms of electric actuators, linear actuators and multi-turn electric devices can be converted by technical means. Similarly, quarter-turn electric actuators can also be converted by adding or subtracting a crank arm.
Second, determine the force or torque (torque) to be output by the electric device
For multi-turn electric devices, part-turn electric devices, and quarter-turn electric actuators, the very important parameter is torque, and the unit is N.m. The opening or closing of the valve requires a torque to act on it. If the torque is small, it may not be able to close or open.
A very important parameter for linear electric actuators is force, the unit is N. If the same force is too small, the valve cannot be opened or closed.
Therefore, in the process of selecting electric devices, follow a simple principle: I would rather choose a large one than a small one.
