Pneumatic V ball valve

Purpose and Characteristics A. The utility model is A right-angle rotary structure, which is matched with the valve positioner to achieve proportional adjustment; V-type valve core is most suitable for various adjustment occasions, with large rated flow coefficient, adjustable ratio, good sealing effect, zero sensitive adjustment performance, small volume, vertical and horizontal installation. Suitable for controlling gas, steam, liquid and other media. B. Features: It is a right-angle rotary structure, consisting of V-shaped valve body, pneumatic actuator, positioner and other accessories; There is a natural flow characteristic of approximately equal ratio; Double bearing structure, low starting torque, good sensitivity and induction speed; Super shearing ability. C. Pneumatic piston actuator USES compressed air as power source to drive the arm to turn 90 degrees through the movement of the piston, so as to automatically open and close the valve. Its components are: adjusting bolts, actuator box, curved arm, cylinder block, cylinder shaft, piston, connecting rod, universal shaft. D, the working principle of pneumatic control valve: pneumatic control valve is composed of the executive body and the regulating body. The actuator is the thrust part of the regulating valve. It produces the corresponding thrust according to the pressure of the control signal and pushes the regulating mechanism to move. The valve body is the pneumatic control valve regulating parts, it directly with the regulating medium contact, regulate the flow of the fluid. The material 1. The material of valve body shall be mainly ductile iron, and the grade and the actual physical and chemical test data of cast iron shall be indicated. 2. The valve stem shall be made of stainless steel stem (2CR13), and the large diameter valve shall also be stainless steel inset stem. 3. The nut is made of cast aluminum brass or cast aluminum bronze, and its hardness and strength are greater than the valve stem. 4, stem bushing material, its hardness and strength should not be greater than the stem, and in the water immersion condition and stem, valve body does not form electrochemical corrosion. 5. Material of sealing surface: Different types of pneumatic valves, sealing and material requirements are different; (2) General wedge gate valve, copper ring material, fixed way, grinding way should be explained; (3) Physical and chemical test data of soft seal gate valve and valve plate lining rubber material; Butterfly valve should be marked on the valve body sealing surface material and butterfly plate sealing surface material; Their physical and chemical testing data, especially the health requirements, anti-aging properties, wear resistance of rubber; Usually use nitrile rubber and epdm rubber and so on, do not mix with recycled rubber. 6. Valve shaft packing: (1) as a result of the pipe network in the pneumatic valve, usually open and close is not frequent, the requirement of packing in a few years is not active, packing is not aging, long-term maintenance of sealing effect; (2) valve shaft packing should also bear frequent opening and closing, good sealing effect; (3) in view of the above requirements, valve shaft packing to do not change for life or more than ten years; (4) if the packing needs to be replaced, pneumatic valve design should consider the situation of water pressure to replace the measures.