by the maintenance point of view, the diaphragm actuators of what life will be limited to the life of the diaphragm. If the diaphragm actuators in slight failure, can't operate. Because the two shell is connected with many bolts, remove the work is laborious and time-consuming. Because the structure of the forward and reverse the role requires different parts, the diaphragm actuators can't reverse the construction site. Diaphragm actuators than other types of pneumatic actuators - about three points Parts, how much it will increase their costs.

although pneumatic diaphragm actuator is common, but the piston cylinder actuators ( Figure 5. 12) Widely used, especially industrial Industrial Valves technology becomes more advanced and more necessary. As shown in figure 5. 13, piston cylinder actuators use - in confined within the cylinder A sliding seal plate ( Called the piston) The operation of a two-way role. For bidirectional movement structure, supply air on both sides by the locator to the piston. For all bi-directional actuator, must use a locator to receive from the controller of pneumatic or electric signal, and the air will be sent to people on one side of the piston, on the other side of the gas is expelled until the piston in the correct position. Although spring - a failure can be placed inside the cylinder Safety parts, but enclosed cylinder actuators do not need resistance is the scope of the spring. More information about the operation and use locator see 5. Section 6.

- like diaphragm actuator structure Sample, the piston cylinder actuators can be used in linear or rotating Industrial Valves. Linear structure is of high efficiency, because the whole movement of actuator is directly transferred to the Industrial Valves stem. Rotational structure, on the other hand, must use some type of the linear motion into rotary motion of the connecting rod. Because of the connecting rod or slot of the rod is invalid, it will produce certain lag or not sensitive region.

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