1、 Core precautions

1. Selection and adaptability

• Media compatibility
  • Confirm the chemical properties (acidity/alkalinity, corrosiveness) and physical properties (temperature, pressure, viscosity) of the medium (gas/liquid), select matching valve body materials (such as stainless steel, brass, plastic) and seals (such as NBR, EPDM, PTFE).
  • exampleWhen transporting strong acid media, PVDF valve body+PTFE seal should be used to prevent corrosion of ordinary stainless steel valve body.
• Pressure and flow matching
  • Ensure that the rated pressure (such as 0-10 bar) and flow rate (Cv value) of the solenoid valve meet the system requirements, avoiding damage to the valve body or control failure caused by overpressure or insufficient flow.
  • AttentionThe Cv value of the pneumatic three-way solenoid valve needs to be calculated based on the pipeline diameter and medium flow rate, with a general margin of 20% -30%.
• Control mode selection
  • Select normally open (NO), normally closed (NC), or dual electronic control (supporting memory function) according to control requirements.
  • Application scenariosSecurity systems typically use normally closed (power-off off), while circulation systems may use normally open (power-off on).

2. Installation and commissioning

• Installation direction and position
  • Vertical installation (with the coil facing upwards) can reduce medium residue, while horizontal installation should ensure that there is no risk of liquid accumulation at the bottom of the valve body.
  • ProhibitedInverted installation (coil facing downwards) may cause seal failure.
• Pipeline cleanliness
  • Clean the pipeline before installation to prevent welding slag and particles from entering the valve body, which may cause jamming or leakage.
  • suggestionInstall a filter in front of the valve (recommended accuracy ≤ 50 μ m).
• electrical connection
  • Ensure that the power supply voltage (such as DC24V, AC220V) is consistent with the rated voltage of the solenoid valve to avoid voltage fluctuations that may cause coil burnout.
  • AttentionWhen wiring for long distances, voltage drop should be considered, and if necessary, power capacity should be increased or cable length should be shortened.

3. Use and maintenance

• environmental adaptability
  • Avoid direct use in high temperature (>60 ℃), high humidity (>90% RH), strong vibration, or corrosive gas environments. If necessary, add protective covers or isolation measures.
  • exampleOutdoor equipment should use solenoid valves with a protection level of IP65 or higher.
• regular inspection
  • Monthly inspection of valve body sealing (soap water leak test), coil insulation (megohmmeter test), and action response time.
  • key pointsSeals aging (such as O-ring hardening) need to be replaced in a timely manner, otherwise it may cause internal leakage.
• Fault handling
  • Common Faults：
    • inactionCheck the power supply, coil, and air source pressure.
    • leakCheck for worn seals, valve bodies, or foreign objects stuck.
    • slow responseClean the air circuit, check for spring fatigue or membrane deformation.
  • emergency measuresEquipped with backup valves or manual operating devices to avoid production interruptions.

2、 Common problems and solutions

3、 Expansion suggestions

1. Redundant designKey workstations adopt the "one in use, one backup" or "dual solenoid valve parallel" scheme to enhance system reliability.
2. intelligent monitoringIntegrate pressure sensors and flow meters to monitor the working status of solenoid valves in real-time and achieve predictive maintenance.
3. Energy saving optimizationSelect low-power solenoid valves (such as DC24V pulse control) and use PLC to achieve on-demand start stop, reducing energy consumption.

By strictly following the above precautions, the service life of pneumatic three-way solenoid valves can be significantly extended, the failure rate can be reduced, and the stable operation of industrial automation systems can be guaranteed.