一．Product Introduction
The pneumatic control valve is to use compressed gas as the power source, the cylinder as the actuator, and with the help of a valve positioner, converter, solenoid valve, retaining valve, gas tank, gas filter, and other accessories to drive the valve, realize the switch value or proportional adjustment, receive the control signal of the industrial automation control system to complete the regulation of pipeline medium: flow, pressure, temperature, liquid level, etc Various process parameters. The characteristics of a pneumatic control valve are simple to control, rapid response, and intrinsic safety, no need to take additional explosion-proof measures.
The main advantages of the pneumatic control valve are that the opening and closing speed of the pneumatic control valve is easy to adjust, the structure is simple, and it is easy to maintain. Due to the buffer characteristics of the gas itself during the operation, it is not easy to be damaged due to jamming. It is more reliable than the electric valve in some explosion-proof situations
二．Product Features
1.It is of low center of gravity, high vibration resistance and easy for installation.
2.They are widely used for automatic production control system in industrials including chemistry, petroleum, light industry, power station, metallurgy
3. COVNA group aims to provide our customers the best quality products with the most competitive pricing, on-time delivery and full warranty service.
三．Technical data
| Type | Single-seat, double seat, sleeve | Nominal diameter | DN20-DN200 |
| Nominal pressure | PN16, PN25, PN40, PN63, PN100 | Connection | Flange, thread, weld (Or other customer specified) |
| Structure | Standard type (-20℃ ~+200℃ ) | Material | WCB, 304, 316, 316L |
| Cooling type |  (-40~450℃ ) | Low-temperature type | (-60℃ ~-196℃ ) |
| Packing | V type PTFE, flexible graphite | Adjustable range | 50:1 |
| Sealing surface | PN16 convex surface, PN40, PN63, PN100 |
| Basic error | Less than full stroke ± 1% (With locator) Less than full |
| Accessories | locator, air filter pressure-relief valve, hand wheel device, limit switch, solenoid valve, lock up valve, and others. |
| Leakage class | Metal seal: Less than 0.01 (ANSI B16.104-1976IV) |
| Soft seal: Less than 0.00001% |
四．The main shape and connection size
