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Clutchless manual override by hand wheel The Keystone F777/778 is a compact The compact electric actuator for quarter turn (90°) valve operationHandwheel. 90° Travel. Actuator. Gear Ratio. Rim Pull. Torque Output. (second)*. Weight. Model. Electric. Manual. Lbs. Lb.-in. Range. (Lbs.) EPI-3. 3500:1. 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 Keystone Figure 777 Electric Actuator. Models EPI-3 to EPI- Manual. Lbs. Lb.-Ins. (seconds)*. (Lbs.) EPI-3 51. EPI-6. Modulating (22 sec. for 90˚). The Keystone EPI2 electric actuators covered in this manual are designed to The electric motor drives an epicyclical gear train via a spur reduction. A constantly engaged manual override (not rotating during motor operation) is fitted to all. EPI-2 actuators. Torque and sizing. The EPI-2 range comprises of A constantly-engaged manual override (which does not rotate during motor operation) is fitted to all EPI2 actuators. Torque and Sizing. The EPI2 range is KEYSTONE. EPI Electric Actuators Figure 777/778 Compact electric actuators for 90° operation of All models incorporate simple manual.