Suitable Fluids for Ball Valve Pneumatic Actuators

Pneumatic actuators are primarily designed for compressed air, but their compatibility with other fluids depends on material construction:

1. Recommended Fluids

Clean, Dry Air (ISO 8573-1 Class 2 or better)

Standard operational medium

Inert Gases (N₂, Argon)

Safe for all seal types (EPDM, Viton, PTFE)

Natural Gas

Requires explosion-proof (ATEX) certification

2. Conditionally Compatible Fluids

Oil-Mist Lubricated Air

Only with NBR or Viton seals (avoid EPDM)

Steam (≤150°C)

Use stainless steel actuators with high-temp seals (FFKM)

3. Unsuitable Fluids

Liquid Water/Oil

Causes corrosion and seal swelling (except for water-resistant models with PTFE coatings)

Aggressive Chemicals (H₂SO₄, Cl₂)

Demand PTFE-lined actuators or alternative materials

4. Special Cases

Oxygen Systems

Require degreased components to prevent combustion

Food/Pharma

Use FDA-grade EPDM seals and oil-free air

Key Rule

Always match seal material (e.g., Viton for hydrocarbons, EPDM for steam) to the fluid. Consult manufacturer charts for chemical resistance. Mismatches cause 90% of seal failures.

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