The pneumatic diaphragm control valve adopts a "elastic diaphragm + pneumatic diaphragm actuator" design. Powered by compressed air, it receives a standard pneumatic signal of 0.02-0.1MPa, driving the diaphragm to deform and displace the valve core, thus changing the flow channel cross-sectional area to regulate the medium.
Simultaneously, the diaphragm completely isolates the valve core from the medium, preventing leakage and contamination. Its core advantages lie in "zero external leakage and corrosion resistance + simple structure": the diaphragm can withstand most acid and alkali corrosion, making it suitable for industries such as chemical, environmental protection, and pharmaceutical processing involving corrosive and easily contaminated media, and it requires no electricity.
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Pneumatic Diaphragm Control Valve Technical parameters
Design and manufacturing:GB/T 12235, ASME B16.34, IEC 60534
The structural length: GB/T 12221, ASME B16.10
Connection forms:HG/T 20592-20605, GB/T 9112-9124, ASME B16.5
Inspection and test:GB/T 13927, API 598, IEC 60534-4
Caliber:1/2″ ~ 12″ (DN15 ~ DN300)
Pressure temporature level:ASME B16.34, GB/T 12224
Drive mode: Pneumatic Actuated
Pressure: PN6 ~ PN64
Pneumatic Diaphragm Control Valve Structural Features
1. Diaphragm Structure: The diaphragm control valve adopts a diaphragm structure, separating the valve body from the actuator, achieving both sealing and stability. Simultaneously, the diaphragm effectively prevents corrosion and wear of the actuator by the fluid medium, improving the valve's durability.
2. High Adjustment Precision: The pneumatic diaphragm control valve offers high adjustment precision, enabling accurate control of the fluid medium. By changing the gas pressure, the valve opening can be precisely adjusted, thereby achieving precise control of parameters such as flow rate and pressure of the fluid medium.
3. Easy Operation: The pneumatic diaphragm control valve is easy to operate. The valve opening can be adjusted by controlling the pressure of compressed air or nitrogen. It also features a manual adjustment function, allowing for manual operation when automatic adjustment fails.
4. Good Stability: The pneumatic diaphragm control valve exhibits good stability, maintaining stable performance under various operating conditions. Furthermore, the valve has overload protection, automatically closing the valve in case of overload to protect equipment from damage.
Pneumatic Diaphragm Control Valve Performance Index
| Project | Index Value | Project | Index Value |
|---|---|---|---|
| Basic Error (%) | Without locator: ±5.0 | Close air – Start: ±5.0 | End: ±2.5 |
| With locator: ±1.0 | With locator – Start: ±1.0 | End: ±1.0 | |
| Backlash (%) | Without locator: 3.0 | Open air – Start: ±2.5 | End: ±5.0 |
| With locator: 1.0 | With locator – Start: ±1.0 | End: ±1.0 | |
| Dead Area (%) | Without locator: 3.0 | Always point deviation (%): ±1.0 | |
| With locator: 0.4 | Rated stroke deviation (%): ±2.5 | ||
| Allowable leakage (l/h) | 1 × 10⁻⁴ × rated valve capacity | ||
Pneumatic Diaphragm Control Valve Precautions
1. When using pneumatic diaphragm control valves, ensure the pipeline is clean and unobstructed to prevent debris and contaminants from entering the valve and affecting its normal operation.
2. During installation and use, strictly follow the manufacturer's instructions for operation and maintenance. Regularly check the valve and pipeline for leaks and blockages, and address any issues promptly to ensure normal operation and extend its service life.
3. If any abnormalities are detected during use, immediately stop the machine, inspect and troubleshoot the problem to ensure safe and reliable valve operation and extend its service life.
Pneumatic Diaphragm Control Valve factory
