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Pneumatic actuator plays a primary role on many fields, and also pneumatic actuator difference obviously exists. There are three angles to distinguish pneumatic actuator difference in this text.
(1) Different executive mechanism
Actuator and the regulating mechanism of pneumatic actuators is the unified whole, the first we should focus on execution to find out pneumatic actuator difference. Actuator contains of diaphragm, piston, fork type and rack and pinion. Piston stroke length is applicable to large thrust applications have requirements; and film type stroke smaller can only directly drives the valve rod. The fork type pneumatic actuator which is equipped with large torque and small space is more suitable for the torque curve of valve, so it is usually used in large torque valves. There are many advantages of the gear and rack type pneumatic actuator, such as simple structure, stable and reliable operations. Certainly, the length of torque, space size and structure of are main factors to discriminate pneumatic actuator difference.
(2) Different valve
Next, pneumatic actuator difference also concludes different valves. There are three valves: ball valve, butterfly valve and plug valve.
① The ball valve. Ball valve according to the structure principle basically a polishing ball core encapsulated in two seats, center of rotation on the fluid to intercept or through the ball core, the upstream and downstream pressure generate force, which makes the ball close to the downstream seat.
② The butterfly valve. Butterfly valve structure principle basically depends on butterfly plate fixed on the axis. Completely seal and close the butterfly plate and valve seat, when the butterfly plate rotates, and the fluid flow in parallel, the valve keeps fully open position.
③ The cock valve. Structure and principle of plug valve is basically according to seal in the tapered plug body. There is a passage in a direction of the plug. The plug is screwed into the valve seat to achieve opening and closing of the valve.
If we pay enough attention to different valves, we can quickly make valve, a distinction on pneumatic actuator difference. Of course, we should better think related factors of when differentiate pneumatic actuator difference.
(3) Different output torque
Last but not the latest, different output torque also causes the pneumatic actuator difference, pneumatic actuators are therefore divided into double action mechanism and single acting actuator.
Double acting actuators
Use the double acting actuators based on DA series electric actuators example. The output torque of gear type actuator is piston pressure on pitch circle radius of income, and the frictional resistance is small and high efficiency.
Next, we take care of the other actuators to know pneumatic actuator difference.
Single acting actuator
Single acting actuator based on SR series pneumatic actuator example. The output torque is obtained during two different operating processes. The first condition: the output torque is obtained by the compression spring in the air pressure into the cavity, and air pressure forces the piston from 0 degree to 90 degree position, torque from the starting point of maximum value decreases gradually. Second condition: the output torque is the cavity loss of gas when the spring restoring force income on the piston, the output torque from 90 degree decreases gradually straight 0 degrees.
Double action and single action is another division of the pneumatic actuator difference, but it was also very important for the user.