Piston Seals in Double-Acting Pneumatic Actuators
Critical components affecting efficiency, durability and system performance
1Air Sealing and Pressure Retention
Preventing Leaks: High-quality seals (polyurethane/Viton) ensure full pressure translation to mechanical force. 5% air loss can reduce torque by 10-15%.
Pressure Rating: PTFE-backed seals prevent extrusion in high-pressure systems (e.g. oil pipelines at 10 bar).
2Friction and Wear Management
3Temperature and Chemical Resistance
Standard nitrile seals swell in solvents - requires FFKM in chemical plants
4Maintenance and Longevity
Self-energizing seals: Lip designs auto-compensate wear for 10,000+ cycles/year
Wiper seals: Protect internals from dust/moisture in outdoor installations
5System Efficiency Trade-offs
Tighter seals increase friction - bottling lines prioritize speed over absolute airtightness
Proper seal selection balances pressure retention, friction characteristics and environmental resistance to optimize actuator performance across industrial applications.
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