Emerson 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.

Specifications of Fisher™ 657 and 667 Diaphragm Actuators

ActuationSpring-return, Linear

CertificationsSIL capable, ATEX, CUTR, PED

Control TypeOn/Off, Throttling

Operating TemperatureCryogenic, Low Temperature, Standard Temperature, High Temperature

Power SourcePneumatic, Manual

Valve TypeAngle Valve, Globe Valve

Other ConfigurationsContact your local Emerson business partner or sales office to learn about additional specifications or options for this product.