Comparison of Servo Cylinder and Pneumatic Valve Positioner Actuator

In conventional cylinder positioning applications, there are usually cylinder positioners or valve positioners on the actuators on site. There is a mechanical feedback connecting rod between the positioner and the actuator such as valve body, flap door or cylinder rod. The connecting rod directly drives the cylinder positioner or valve controller with precise design, complicated adjustment and poor resistance to external force and impact. Cylinder positioners or valve positioners are often used in harsh environments such as corrosion, high temperature, high humidity, mud, flammable and explosive, and if they are used improperly, this part is often damaged. For example, the pneumatic control valve will always have troubles caused by the imbalance of the cylinder positioner in harsh environments.

The servo cylinder gets rid of the cumbersome and complicated mechanical connection mechanism. For the field actuator, the servo cylinder has no cylinder positioner or valve positioner, but only an electric feedback sensor casted inside the cylinder. The sensor can work normally at a high temperature of 120 °C and is cast inside the cylinder, which will not affect the standard cylinder installation size space, and because it is a high temperature casting package, there is no need to worry about the harsh environment on site. It is only designed on the actuator or valve body in the form of a conventional cylinder. It brings unparalleled convenience to design and field use.

In addition, the electronic control part of the servo cylinder is an intelligent control core. Although the control core is highly integrated, highly intelligent, and very precise, it does not need to be mechanically connected to the actuator, but only needs one wire and two air pipes to be connected, so that it can be far away from the scene. , installed in the safe area, or even inside the power distribution cabinet. Thus, the cumbersome and complex control of mechanical connection feedback becomes an intelligent electronic cylinder positioner control. Wear electrode

Servo cylinder does not need special instrument, and can complete synchronous displacement remote transmission display through electronic cylinder positioner, multi-channel switch programmable control, open 485 communication programming port can complete communication with instrument and PLC, and there is a programmable PID adjustment system inside. The lead and lag phenomena in process control can be adjusted more precisely.