The regulator valve actuators and accessories, also known as control, is an executive components. It receives the signal control system, according to the required flow rate, speed and direction to change process parameters. It is mainly composed of actuators and valve. Pushes, actuator and valve regulating role. Regulator is the main type actuator. Actuator is a kind of directly change the instrument operating variables, is a kind of terminal device. In the practical application of actuators, in order to get a good regulating quality, in addition to the actuators and actuators, and other special instrument, such as: valve positioner, terminal switches, electronic instruments, manual device.

The classification of the actuator

Actuator by using the energy points: can be divided into three categories: pneumatic actuator, electric actuator, hydraulic actuator.

1. Pneumatic actuators

Pneumatic actuators according to the air pressure change of valve core movement pattern is divided into two categories: diaphragm actuator and the piston actuator.

Regulator is the most common type of actuator diaphragm actuators. Piston type actuators can be a single function, can also be a dual role.

2. The electric machine

Electric machine also can be divided into two broad categories: step motor motor actuators; Three-phase asynchronous motor actuators.

3. Perform hydraulic cylinder

Hydraulic actuator using less on regulating valve, generally can be divided into: linear hydraulic actuators; Circulating hydraulic actuators; Rotary hydraulic actuator.

Pneumatic actuators

Pneumatic actuators is a fast action. Compressed air as power source, it can in a relatively short period of time, quickly filled the entire volume and achieve system work pressure.

Usually, this actuator is variable, the cycle time of change in a few seconds to minutes between percentage, and according to the control signal of CVT. When using compressed air as power and actuator control signal (pneumatic or hydraulic) into displacement.

As shown, when actuator substitute valve positioner, pneumatic signal into the valve positioner; When the actuator without a valve positioner type, directly into the regulating valve control signal.