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Fisher Actuator

Fisher Actuator

Features

Application Versatility–Five actuator types in eleven sizes are available for an extensive variety of
applications. Spring rates, travel stops, andmanual operators are available for nearly any control valve
application.
Excellent Linearity Between Loading Pressure and Travel–A molded diaphragm travels in a deep
diaphragm casing,minimizing area change throughout the travel.
High Degree of Dynamic Stability and Frequency Response–A shallow casing on the pressure side
means reduced volume on that side, thereby minimizing response time.
High Thrust Capability–Themolded diaphragm allows maximum thrust for given diaphragm size.
Long Service Life–Rugged thick-walled cast iron and steel construction provides increased stability,
corrosion protection, and protection from deformation should over-pressurization occur.

Cold Service Applications–Enhanced product specifications for all sizes of 657 and 667 diaphragm
actuators allow performance to -50_C (-58_F). Use of a positioner is recommended to ensure
responsiveness in applications operating below -40_C (-40_F).
Positive Connections–A split block stemconnection provides a solid transfer of motion while allowing
easy mounting. The absence of linkages helps to avoid lostmotion and inaccurate valve positioning

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