《年轻女教师2》在线播放,在线综合亚洲欧洲综合网站,8x国产精品视频,久久久久久久久毛片精品

1. Purpose and characteristics of pneumatic control valve:

Its purpose is a right angle rotary structure, which can be used together with the valve positioner to realize proportional adjustment; V-shaped valve core is most suitable for various regulating occasions. It has large rated flow coefficient, large adjustable ratio, good sealing effect, sensitive regulation performance and small volume. It can be installed vertically and horizontally. Suitable for controlling gas, steam, liquid and other media.

It is characterized by a right angle rotation structure, which is composed of V-shaped valve body, pneumatic actuator, positioner and other accessories; It has a natural flow characteristic of approximate equal percentage ratio; It adopts double bearing structure, small starting torque, excellent sensitivity and induction speed; Super shear capacity.

2. The pneumatic piston actuator uses compressed air as the power source to drive the crank arm to rotate 90 degrees through the movement of the piston, so as to make the valve open and close automatically. Its components are: adjusting bolt, actuator box, crank arm, cylinder block, cylinder shaft, piston, connecting rod and cardan shaft.

3. Working principle of pneumatic control valve: pneumatic control valve is composed of actuator and regulating mechanism. The actuator is the thrust component of the regulating valve. It generates the corresponding thrust according to the control signal pressure to promote the action of the regulating mechanism. The valve body is the regulating part of the pneumatic regulating valve. It is in direct contact with the regulating medium to regulate the flow of the fluid.

Summary features: the pneumatic control valve has the advantages of simple control, fast response and intrinsic safety. No additional explosion-proof measures are required. Pneumatic control valve is driven by compressed air to realize on-off or proportional regulation. With cylinder as actuator, it receives the control signal of industrial automation control system to adjust various process parameters such as flow, pressure and temperature of pipeline medium.