Q&A

If a pneumatic valve fails to operate, please check the following:

  1. Check Air Supply Pressure
    Ensure the operation pressure from the source is sufficient and meets the valve’s minimum pressure requirement. Insufficient pressure may prevent the valve from actuating properly.

  2. Check Power Supply
    Verify that both the pneumatic pressure source and solenoid power (electrical control signal) are active and within the specified operating range.

  3. Further Action
    If the valve still does not operate after confirming pressure and solenoid conditions, we recommend returning the valve to TCT for further inspection. This will help ensure accurate diagnosis and avoid potential damage from improper use.

If your pneumatic valve is not closing properly, this may indicate internal wear or mechanical degradation of components such as the bellows, seals, or actuator mechanism.

Recommended Actions:

  1. Inspect the System

    • Check whether sufficient air pressure and control signal are being supplied to the valve.

    • Confirm that there is no debris or particle buildup inside the valve body or actuator path.

  2. Assess Component Wear

    • Over time, critical sealing or moving parts may wear out, especially in high-cycle or corrosive environments.

    • If external conditions are normal but the valve still does not respond, internal wear is likely.

  3. Service & Warranty

    • Please check the product's warranty status.

    • We recommend that you return the valve to TCT for inspection or servicing, especially if it is under warranty or part of a high-precision application.

If a pneumatic valve is leaking during operation, the most likely causes are worn or damaged sealing components, such as the O-ring or the bellows (feedthrough assembly).

Recommended Actions:

  1. Inspect Sealing Components

    • Check the O-ring for signs of wear, cracking, or deformation.

    • Examine the bellows/feedthrough for leaks, pinholes, or fatigue failure due to pressure cycling.

  2. Replace Damaged Parts

    • If damage is confirmed, replace the O-ring and/or feedthrough assembly with TCT-approved parts and procedures.

    • For safety and performance assurance, replacements should be carried out by trained personnel.

  3. Return for Service

    • If in-house repair is not possible or the root cause is unclear, we recommend returning the valve to TCT for professional inspection and servicing.

If the valve position sensors are not responding correctly, the issue may be due to a wiring problem or sensor failure.

Recommended Troubleshooting Steps:

  1. Check Sensor Wiring and Connector

    • Inspect the sensor cable and connector for loose, damaged, or misaligned pins.

    • Ensure the sensor is firmly and correctly connected to the valve interface or control panel.

  2. Test Sensor Signal

    • If wiring appears intact, test the sensor output using a multimeter or diagnostic tool to verify signal response during valve actuation.

  3. Replace Faulty Sensor

    • If the connection is correct but the sensor still does not respond, it may be defective or damaged.

    • Please replace the sensor with a compatible model recommended by TCT.

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