Pneumatic valve actuator 6 series

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Fisher 657 and 667 actuators are designed to provide dependable on/off or throttling operation of control valves. These spring-opposed diaphragm actuators position the valve plug in the valve in response to varying controller or valve positioner pneumatic output signals. The 657 actuator is direct-acting, while the 667 is reverse-acting. Specifications Certifications -SIL capable, ATEX, CUTR, PED Control Type -On/Off, Throttling Operating Temperature -Cryogenic, Low Temperature, Standard Temperature, High Temperature Valve Type -Angle Valve, Globe Valve Other Configurations -Contact your local Emerson business partner or sales office to learn about additional specifications or options for this product. Features -The integral mounting pad eliminates the traditional mounting bracket and reduces the number of parts required to mount. -Incorporates an integral air passage that eliminates the need for external tubing and fittings when paired with a Fisher FIELDVUE™ instrument. -Both 657 and 667 actuators are compatible with instruments that utilize traditional bracket-based mounting kits. The 667 can be externally tubed for instruments or accessories when required. -Spring rates, travel stops, and manual operators are available for nearly any control valve application. -A molded diaphragm travels in a deep diaphragm casing, minimizing area change throughout the travel. -A shallow casing on the pressure side means reduced volume on that side, thereby minimizing response time.