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Keystone F89C Pneumatic Quarter­Turn Actuator
F89C Pneumatic Quarter-Turn Actuator
The F89C addresses the specific requirements for automated quarter-turn valves in the chemical industry on top of the reliability and low maintenance cost offered


  • Valve connection compatible with ISO 5211, including spigot plate for alignment.
  • Double Rack and Pinion design nullifies side loads on the pinion shaft, minimizing bearing wear and extending life.
  • Optimized product flow with standard mounted travel stops for valve position adjustment in open and close position (+/- 5° at each end).
  • Anodized aluminium body with electrostatic powder coating (ESPC) finish provides durable protection against corrosive environments.
  • Double acting and spring return versions available for cost effective and safe operation.
  • Up to 12 individual springs offer flexible torque range for both ball as butterfly valves.
  • Pre-compressed spring design and anti-blowout travel stops and drive pinion provide safe maintenance and operation.