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Pneumatic actuators contaction
Pneumatic actuators and regulating mechanism is a unified entirety and its executing agency has the type of piston, fork type and gear rack type. Piston stroke length, for applications that require a greater thrust occasions while smaller films stroke can directly drive the valve stem. The Fork-type pneumatic actuators have special characteristics including large torque, small space, and more in line with the valve torque curve, but they are not very beautiful. They are commonly used in high torque valves. In addition, there are several advantages of rack and pinion pneumatic actuator such as simple structure, stable and reliable operation and safety explosion-proof, etc. There is a wide range of applications requiring high security production process, power plants, chemical, refining, etc.
The type and structure of the pneumatic actuator adjusting mechanism is substantially the same, the main difference is the implementing agency. Therefore, the actuator and valve are introduced into two parts of pneumatic actuators. According to a pneumatic actuator and valve actuators (regulating mechanism) consists of two parts. Depending on the size of the control signal, it produces thrust and push valve operation. Regulating valve is part of a pneumatic actuator, under the effect of the thrust actuator, control valve displace or produce a certain angle which directly regulate the flow of fluid.
Actuators are divided into pneumatic, electric and hydraulic three categories by their energy form. They have their own characteristics and are suitable for different occasions. Pneumatic electric actuators can also be divided into single-acting and double acting two types: switch actuator moves are executed by the gas source to drive, called DOUBLE ACTING. SPRING RETURN switching action is only open gas supply driven, and when closing the action spring returns.
Pneumatic actuators which are different from other actuators’ biggest feature are its unique structure fork-type institutions coupled with its patented technology to the pneumatic actuator is far superior to other peers. It has the characteristic with small size, light weight, torque, and long life. The pneumatic actuator "single cylinder double piston - type variable torque fork" transmission structure and a low friction, long life-oriented multi-patented sealing technology, and use of a standard carbon graphite PTFE-sealing piston, so that the output torque requirements in line with changes in gate switch. In addition, "Scotch-joke" big moment pneumatic actuator structure is designed for torque largest motion characteristics or closes the valve start point and the point needed to design. Structure is innovative and flexible and the actuator piston motion into linear output shaft the rotary motion, resulting in more than ordinary rack and pinion pneumatic actuators is 50% of the starting torque.
Modern control systems are becoming increasingly complex and sophisticated; it is not some kind of drive control system that can meet a variety of control functions. Electric actuator is mainly used for applications requiring precise control, flexible automation equipment requires continuous improvement, the same equipment is often required to adapt to the needs of different sizes of the work piece machining, the actuator needs to be multi-point positioning control, but also for the actuator running speed and torque control or synchronization precise tracking of these using conventional pneumatic control can not be achieved, and electric actuators can be very easy to achieve such control. Thus comparing pneumatic actuators for simple motion control and electric actuators are used for precision motion control applications.