Fisher 657 and 667 Diaphragm Actuators

Fisher 657 and 667 Diaphragm Actuators

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.

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Andreas Christoffersen
Account Manager
Phone. +46 54-52 46 18

Erik Rune
Solution Seller
Phone. +46 54-57 92 31

Niklas Pettersson
Account Manager
Phone. +46 54-57 92 09

Rickard Andersson
Account Manager
Phone. +46 40-33 02 34

Klaus Bergmann
Area Account Manager East & West
Phone. +45 2112 3345

Peder Hvidberg
Area Account Manager West
Phone. +45 2178 5053

Pekka Immonen
Key Account Manager
Mob. +358 45 168 8355

Taneli Luhanko
Inside Sales Engineer
Phone. +358 207 416 202
Mob. +358 40 757 4208

Actuation Spring-return, Linear
Certifications SIL capable, ATEX, CUTR, PED
Control Type On/Off, Throttling
Operating Temperature Cryogenic, Low Temperature, Standard Temperature, High Temperature
Power Source Pneumatic, Manual
Valve Type  Angle Valve, Globe Valve
  • 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.
  • The molded diaphragm allows maximum thrust for given diaphragm size.
  • Rugged thick-walled cast iron and steel construction provides increased stability and corrosion protection.

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