straight cylinder actuator structure includes a casting of the yoke, it is used and the valve body, it also provides space for the connection between valve stem and valve actuator rod, will be installed on the valve cylinder structure, supporting actuator rod and install locator and other accessories, etc. According to operating conditions, yoke can be made of aluminum, Considering weight and machining) Or either of steel manufacturing. For the condition of fire sensitive, high melting point of steel in preference to aluminum. Inside the cylinder should be processed in order to form a better seal.

for - piston itself Flat, it processing to approximate to the cylinder bore. A 0 ring ( Or other elastomer seal) Embedded people along the potatoes on the edge of the piston seal groove. When 0 to install piston ring and cylinder, piston wall lubrication and produce stable sliding friction. If you need to use the failure - Safety spring, it can be installed in the upper part of the piston or the bottom of the piston. Don't like the diaphragm actuators for the scope of the resistance of different need different spring, piston cylinder actuator failure - just in the spring Need in the safe operation. So only need a heavy load of the spring actuator to adapt to the size of most condition of thrust needed to. Can be used for special working condition of high pressure drop, a suit of spring ( A spring within another spring) As shown in figure 5. 14. Using the adjusting bolt to the spring pressure.

the adjusting bolt compression spring until you reach the required elastic restoring force. With different lengths of adjusting bolt can change the spring compression force. Using the split pin facilities or bolt will cylinder; Install over the yoke. Actuator rod is installed on the piston and on the top of the yoke is supported by guide, it is from the bottom of the air chamber 0 of the o-ring seal. For piston cylinder actuators, actuators, and the body is the most common way of connection between the two pieces of yoke clamp ( Figure 5. 15) 。 It does not require a larger thread and yield production close connection, but atmospheric corrosion is a problem. Clamp can prevent the actuator stand with the valve stem accidentally rotate. Band can also be equipped with indicator to indicate or position of the Industrial Valves actuator.

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