Adjusting the Opening/Closing Speed of a Ball Valve Pneumatic Actuator

To control the actuation speed of a pneumatic actuator, follow these steps:

1. Flow Control Valves (Needle Valves)

Installation

Mount on the actuator's inlet/outlet ports to regulate airflow

Adjustment

  • Clockwise (close): Slower speed (restricts airflow)
  • Counterclockwise (open): Faster speed (increases airflow)

Fine-Tuning

Balance both ports for smooth operation (e.g., 3 - 5 sec for 90° rotation)

2. Quick Exhaust Valves (QEVs)

Function

Accelerates exhaust airflow for faster closing (spring-return actuators)

Placement

Install near the actuator's exhaust port

3. Pressure Regulation

Reduce Supply Pressure (0.3 - 0.5 MPa)

For slower movement

Increase Pressure (0.6 - 0.7 MPa)

For faster response (ensure torque is sufficient)

4. Cushioning (for Heavy Valves)

Piston Dampers

Absorb impact at end-strokes to prevent water hammer

Best Practices

  • Test adjustments under load conditions (unloaded tests can mislead)
  • Avoid over-restriction (causes jerky movement or incomplete rotation)

Result: Optimized speed prevents valve slam (pipe damage) and ensures precise flow control