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View online(28 pages) or download PDF(1.82 MB) Keystone Electric Actuators model EPI-2 IOM Owner's Manual • Electric Actuators model EPI-2 IOM pdf manual Operating and Maintenance Instructions for: Figure 79 Pneumatic Actuators (U/E options). Introduction. The Keystone Figure 79 Pneumatic Actuator. Keystone Figure 79U/E Pneumatic Actuator Acting (air to air) and Single Acting (spring return), 90° operation, pneumatic actuators. Catalogs. Manual. Travel stops. • Declutchable manual override gear units. High visibility indicator. Keystone Controls is a division of Keystone International, Inc. All models incorporate simple manual override facility. • Quick connect terminal strips for ease of electrical wiring. • Simple limit switch setting, using Keystone F89 actuators are rated for compressed air pressure in the range of 2.75 barg (40 psig) to 8.3 barg. (120 psig) and will withstand a maximum static. Standard manual override does not require use of levers or latches. Direct mounting to Keystone valves or Keystone Figure 777 Electric Actuator.The Keystone EPI2 electric actuators covered in this manual are designed to automate quarter-turn industrial valves (ball, butterfly, plug,