most of the use of certain types of connecting rod rotating structure to linear motion into rotary. Figure S. 16 said a common structure, it is a bar with slot installed on the Industrial Valves shaft, and a fulcrum on actuator rod in order to reduce lag phenomenon. The structure of the arrow to a sliding seal so that the piston swing motion, when the actuator rod with rod stroke rotates, the piston will be slightly. As shown in figure 5. 17, another common rotary piston cylinder structure using grooved rod, the rod intersect with the actuator rod pin. This structure to avoid the oscillating piston and it needs the sliding sealing, but its because take Du rod structure, it has the potential of some slight lag and insensitive area.

for this kind of structure, heavy load of the return spring is located in the cylinder and relative to the other - below A single room. Piston cylinder actuators are reversible, it means that the same actuators can transform to both air - Closed ( Actuator stem extension) And the air - Open ( Actuator stem shrinkage) As shown in figure 5. 18. For the air - Closed structure, the spring is located in the bottom of the piston and yoke of the top ring groove is used to keep in place.

the piston cylinder actuator operation is very simple, as an air - Shut down the signal from the controller to the locator, the locator gave away the air cylinder piston above the top of the indoor gas, locator will corresponding number air since the words below the plug at the bottom of the chamber. Two indoor air pressure changes cause the piston moves down, after Kui actuator rod moves down, and so is the Industrial Valves stem. When the signal to & other; Open & throughout; , the lower the air chamber air pressure, and the upper air chamber pressure is expelled, face to the piston moving up, so open valve closure components.

if the signals or power supply disruptions, the piston by means of failure - Safety spring and moves to its relaxed position. In the air - Shut down, with the valve stem shrinkage in the relaxed state. In the air - Open, with the Industrial Valves stem extensions in the relaxed state.

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