Keystone Figure 79U/E Pneumatic Actuator

Double Acting (air to air) and Single Acting (spring return), 90° operation, pneumatic actuators.




  • Compact rack and pinion design utilising the whole piston area to develop output torque.
  • Pistons with integral rack drive reducing the number of dynamic seals, minimising air leakage.
  • Double pistons nullify sideloads on the pinion shaft, minimising bearing wear.
  • Springs epoxy painted and colour coded for additional corrosion protection and ease of identification.
  • Hard anodised aluminium body, with external ESPC finish, protects against corrosive environments including saliferous atmospheres.
  • Alternative finish: electroless nickel plating.
  • Female output drive enabling direct mounting in certain applications, thereby eliminating special connections and guaranteeing correct alignment.
  • Bottom entry pinion shaft.
  • Anti-friction piston pads ensuring no metal to metal contact, providing a smooth operation. Ideal for modulating or on/off control applications.
  • Adjustable travel stops in both directions on certain models.
  • Grease lubricated for life.
  • ATEX certified II 2 GD.



Long Lasting Butterfly Valves with a Sturdy Reputation

Emerson’s Keystone offer a complete range of butterfly valves from general purpose through to heavy duty and high performance models. With a tradition of more than 70 years, Keystone built its reputation on providing industrial process butterfly valves known for their reliability, long service life, and reduced operating costs. Independent, third-party life-cycle testing has shown that Keystone resilient-seated butterfly valves last 2.5 times longer than competitors' butterfly valves.  

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