Providing thrust output up to 79,000 lbf for short- to long-travel applications, Fisher® 685 double acting piston actuator is designed for use with medium and large Fisher sliding-stem control valves, including easy e™ and FB series, in general, severe, and critical service applications. Piston diameters and travel range, respectively, from 305–660 mm and 25–610 mm; special constructions are available up to 1,118 mm piston diameter. Operating range is -40 to +93°C as standard.
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