in one-way function actuators, air chamber on one side of the diaphragm using internal spring and the other side of the diaphragm. Scope of the internal spring called spring, when the air indoor air pressure to reduce, it can make the actuator in the opposite direction. Scope of the role of the spring - like a failure Security agencies, when the air supply to the actuators is interrupted, it can make the rotary actuator to either of open or closed position. According to the external shape, spring installation in the adjacent to the diaphragm or adjacent to the diaphragm plate. Actuator rod connected to the diaphragm plate, and through the yoke at the top of the use of guide and support. When the air pressure increases with the diaphragm movement, plate movement in the corresponding the form. Linear motion directly sent to the actuator stem, the stem within the valve drive closure components. Actuator with yoke is installed on the valve body, indicating the location of the actuator or industrial valves, and support bar actuator, and make the actuator stem and valve stem connection. It also can make the attachment convenient installation. For diaphragm actuator, the Industrial Valves and actuator is the most common method of connection between the threaded yoke nut. Use fixture in order to prevent the actuator stem with the valve stem of accident, foothill fixture should be equipped with indicator to show on the actuator or valve position. For convenient one-way diaphragm institutions, the air by the controller to the actuator signals have double 1 heavy effect, provide positioning signals it first, secondly it provides the power to produce the required thrust, thrust should be able to overcome the technological force, friction force, gravity, closed component weight and resistance produced by range to play. Diaphragm actuators have positive effect and reverse effect two kinds of structure. The positive effect structure ( Figure 5. 9) , compressed air for actuators, it makes the actuator stem extensions and led to the closing of the valve. This also means that lost in the air, the executing agency will shrink actuator rod and make the valve opened and remain open. A reverse effect for structure ( Figure 5. 10) , when the air pressure for actuators, stem shrinkage and make the valve opened. If to disrupt gas or air pressure, actuator movement to the extension position and to close the valve.

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