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The pneumatic actuators are the integration of the actuator and regulating mechanism. And its actuator consists of diaphragm type, piston type, pusher type as well as pinion and rack type. Among all of them, the piston type has long route, so it is suitable for occasions with larger thrust. However, the diaphragm type has small route, which is only able to drive the valve rod directly. And the pusher pneumatic actuator has the features of large torque, small space, suitable torque curve and other features, but its appearance is not very good. Therefore, the pusher pneumatic actuators are always used on 3-way Ball Valve ; with large torque. In addition, the pinion and rack pneumatic actuators possess simple structure, reliable action as well as explosion proof. Thus, it has been widely used in power station, chemical industry as well as oil refining industry.
Although there are many classifications of the pneumatic actuators, the structures of all the regulating mechanisms are almost the same. Therefore, the biggest difference of the pneumatic actuator layout is their actuators. The main pneumatic actuator layout includes actuator and regulating valve. And the pneumatic actuators are able to create corresponding thrust according to the magnitude of the signals to drive the action of the regulating valve. And the regulating 3-PC Ball Valve is the regulating part of the pneumatic actuator layout. Therefore, under the function of the actuator, there is some certain displacement or corner appearing on the regulating valve to regulate the flow of the fluid directly.
What’s more, the detailed pneumatic actuator layout is as follows.
First of all, the pneumatic actuators are composed of air cylinder, piston, gear shaft, end cover, sealing element as well as screws. And the whole set of the pneumatic actuators should also include aperture indicator, range limit, magnetic valve, locator, pneumatic actuators element, hand-operating mechanism as well as signal feedback. And the linkage size of the pneumatic actuators and valve should conform to the stipulation. What’s more, the pneumatic actuators with hand-operating mechanism are able to carry out on and off action of the pneumatic actuators ball valve with its hand-operating mechanism when the air supply is off. When facing the hand wheels if you want to open the valve, you’d better contra rotate the hand wheels or hand shank.
And if you want to close the valve, you just need to rotate the hand wheels or hand shank clockwise. When there is inside and outside threads on the end of the piston rod, it is necessary to equip it with applicative wrench place of the standard wrench. In addition, the sealing ring of the piston should be convenient to change and maintain. And stroke length of the buffer gear of the pneumatic actuators should accord with the national standard. There should be cylinder block to regulate its buffer action as for the pneumatic actuator layout of the pneumatic actuators with buffer gear. And the dimension of the thread of the air inlet and air outlet should live up to the attachment norm.
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