Pneumatic Actuator Alignment Procedure
Step-by-step guide for precise shaft-stem alignment
1. Pre-Alignment Preparations
Ensure shaft diameter, keyway, and mounting flange (ISO 5211 standard) match valve specifications. Check for physical damage like burrs or corrosion.
Manually rotate valve stem to mid-stroke position. Secure both valve and actuator on stable surfaces to prevent movement during alignment.
2. Mechanical Alignment Steps
Align flange bolt holes using guide pins. Gently slide actuator shaft onto valve stem, ensuring keyway alignment. Never force insertion.
Use dial indicator to measure radial runout (≤0.005" standard, ≤0.002" high-precision). Adjust with shims as needed.
Tighten bolts in star pattern to manufacturer's torque specs (typically 20-30 N·m for M8). Over-tightening warps flange.
3. Functional Testing
Rotate actuator through full stroke (90° for quarter-turn valves). Movement should be smooth without binding.
Apply 30 psi air pressure. Verify full stroke operation and position accuracy using limit switches.
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