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.

Any questions?

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

Kenneth Olsson
Account Manager
Phone. +46 54-57 92 04

Martin Pettersson
Solution Seller
Phone. +46 54-57 92 40

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

Morten Noppenau
Area Account Manager East
Mob. +45 2121 3491

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

Satu Mäkelä
Key Account Manager
Phone. +358 207 416 207

Taneli Luhanko
Inside Sales Engineer
Phone. +358 207 416 202
Mob. +358 407 574 208

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.

Questions about the product?

Fill out the form below and we will contact you with answers to your questions