Classification of pneumatic actuators and instructions for use

Classification of pneumatic actuators and instructions for use

Classification of pneumatic actuators

What is the classification of pneumatic actuators? Many friends must want to know this question. Next, Xiaobian will carefully introduce the classification of pneumatic actuators.

Several common pneumatic actuators are mainly thin film type, piston type, fork type and rack and pinion type, different types of applications are also different.

Generally speaking, the piston stroke is longer, suitable for the occasion of the need for larger thrust; Thin film stroke is small, can only drive the stem directly; Fork pneumatic actuator has large torque, small space, torque curve is more in line with the characteristics of valve torque curve, but not very beautiful, often used in large torque valve; The gear frame pneumatic actuator has simple structure, stable and reliable action, safe and explosion-proof, and is widely used in the production process with high safety requirements, such as power plant, chemical industry and oil refining.

In addition to the above common pneumatic actuators, we also need to understand that pneumatic actuators can also be divided into single function and double function. The switching action of the actuator is driven by the air source, which is called DOUBLEACTING. (Single action) Actuator can only be driven by air source, the opposite action by spring reset.

Instructions for use of pneumatic actuators

According to the actual needs, the types of pneumatic actuators are mainly divided into piston type double acting cylinder and spring tube type single acting cylinder. Specific information can be found online. The positioner adopts ABB or Siemens intelligent positioner, the position feedback and electrical conversion are the integration of the positioner, and the control and feedback accuracy is high (controllable within 1%). The installation position of the positioner is very important and needs to be controlled within the adjustable range. Three - break protection can be set according to the system needs, no hard and fast provisions. The air source is required to be high, and water and granular impurities cannot be taken, otherwise the valve will be blocked and the actuator will refuse to move. The probability of failure in actual use is very low, which is generally caused by mechanical jam. The fault is easy to judge and handle, and the debugging is simple (intelligent menu). The above requirements for air sources are high, and water and granular impurities may damage the locator.