6 Key Tips for Selecting the Right Pneumatic Valve

1. Clarify the core parameters of working conditions and lay a solid foundation for selection

• Fluid characteristics: Clarify the medium type and corrosivity, select suitable materials (e.g., stainless steel for rust prevention, PTFE seals for leak prevention), and match the medium viscosity and temperature range.
• Temperature and pressure requirements: Confirm the system working pressure (0.4-0.7 MPa for conventional applications) and temperature range. The rated pressure of the valve should reserve a 20%-30% safety margin to adapt to high-pressure, high and low temperature working conditions.
• Environment and flow rate: For outdoor valves, select weather-resistant materials (e.g., SUS 304 stainless steel); measure the flow pressure drop with a flow meter and match the valve flow capacity (Cv value) to avoid malfunctions caused by improper sizing.

2. Select the appropriate valve type and structure rationally

• Core types: Ball valves are suitable for high-pressure and quick shut-off scenarios; butterfly valves are ideal for large-caliber and medium-pressure working conditions; gate valves are adapted for high-pressure, high-temperature and large-caliber pipelines; diaphragm valves excel in handling corrosive and viscous media (e.g., pharmaceutical industry).
• Structural details: The installation method (body inlet/base) affects compatibility; the connection method (flange/thread/welding) is adapted to different calibers and pressures; the port configuration (3/5 ports) determines the action range; the sealing method (soft/hard seal) matches the temperature and pressure requirements.

3. Choose the Right Actuator: Single-Acting vs Double-Acting

• Single-Acting (Spring Return): It is opened by air pressure on one side and reset by a spring. Its core advantage is the Fail-safe function—it automatically resets (normally open or normally closed) when air supply is lost, making it suitable for working conditions with extremely high safety requirements.
• Double-Acting: Both opening and closing are driven by compressed air. They can provide greater output torque and more precise control, and feature a more compact structure, making them suitable for automated production lines with stable air supply.

4. Focus on Sealing and Wear Resistance to Reduce Operation and Maintenance Risks

• Sealing performance: Select the sealing grade according to working conditions (zero leakage is required for flammable and explosive media) and match the sealing materials (nitrile rubber/fluororubber/PTFE/metal seals).
• Wear resistance: For working conditions with particulate media and frequent on-off operations, select valve cores and seats made of stainless steel and cemented carbide; prioritize modular and easy-to-clean valves to reduce maintenance costs.

5. Balance Installation, Maintenance and Cost Control

• Installation and maintenance: Select the valve size and connection method according to the installation space and pipeline layout; prioritize valves with simple structures and universal accessories, and match with positioners and other devices for easy fault diagnosis. Conduct regular inspections for leaks and lubrication.
• Cost control: Choose high-quality domestic valves for ordinary working conditions and high-performance valves for complex working conditions; prioritize energy-efficient actuators, taking into account both the initial procurement cost and long-term energy consumption and maintenance costs.

6. Pay Attention to Standards and Certifications: The Final Safety Line

Summary