this structure provides a small shape and compact actuator, and there is no external linkage between Marine Industrial Valves actuator and positioner. For internal air channel, the removal of the pipeline, reduce the possibility of a pipeline damage and joint leakage. The only drawback is that this kind of structure box assembly designed cannot remove. It will need the whole assembly of the spares, is spending more than changing the spare parts are not durable.

another commonly used pneumatic actuators is Marine valve gear actuator, it can effectively transform the linear motion of the piston actuator for rotary motion. Rack and pinion actuator is widely used for manipulating a quarter of rotary valve ( Ball valve, plug valve and butterfly valve) 。 On both ends of two pistons are placed outside the whole bright, typical of the shell is made by stamping aluminum or stainless steel. Each piston connection to have a bunch of straight teeth on the rack, and linear motion with the piston. In most cases, the rack is piston itself part of a whole. Clamping is between two rack gear, it is a shaft with straight teeth. The shaft directly connected to the Industrial Valves stem. For direct effect of rack and pinion actuators, when the air was sent two the outside of the indoor air, around the inside of the plug to move air chamber, and the

atmospheric vent. When two piston relative to mobile rack to move in the opposite direction and make the drive gear rack in counterclockwise direction. As shown in figure 5. 24, when directly improve the air inside the air chamber pressure, the lateral air chamber and exhaust, two words Qian moved to leave each other and driven gear in a clockwise direction.

rack and pinion actuators can be equipped with the internal spring, when air or interrupt signal, can make the actuator failure mode ( Failure - Clockwise direction, failure - Anticlockwise) , they use to dismantle the end cap and the piston rotating 180 p method and reverse operation in the factory now. Rack and pinion actuator can also be equipped with tour stop in order to accurately adjust Industrial Valves open and closed position.

resilient seated gate valve are all following the most compatible manufacturing regulations.
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cast iron valve wedge gate valve are used largely for resilient seated valve such as os&y gate valve.
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