First, the main types of pneumatic valves: 1) pneumatic V-type regulating valve 2) pneumatic O-cut ball valve 3) torque cylinder valve 4) electromagnetic diaphragm valve 5) Pneumatic straight-acting diaphragm valve 6) Valves: Use and Features A, use is a right-angle rotary structure, which is used with the valve positioner supporting the ratio can be adjusted; V-type valve is most suitable for a variety of regulatory occasions, with a large flow coefficient, adjustable ratio , Good sealing effect, zero adjustment performance, small size, can be installed vertically. Suitable for controlling gas, steam, liquid and other media. B, Features: Is a right-angle rotary structure, the V-valve body, pneumatic actuators, locators and other accessories; there is an inherent equal flow characteristics of similar hundred; using double bearing structure, the starting torque is small, with very Good sensitivity and speed of induction; Super shear capacity. C, pneumatic piston actuator using compressed air as a power source, driven by the piston crank to carry out 90-degree rotation, so that the valve automatically open and close. Its components are: adjusting bolt, actuator box, crank arm, cylinder block, cylinder shaft, piston, connecting rod and cardan shaft. D, pneumatic control valve works: Pneumatic control valve by the implementing agencies and regulatory agencies. Actuator is the thrust member of the regulating valve, which generates the corresponding thrust according to the magnitude of the control signal pressure and drives the adjusting mechanism to act. The valve body is the regulating part of the pneumatic control valve which is in direct contact with the regulating medium to regulate the flow of the fluid.