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Frequently Asked Questions

What are the Fisher 657 and 667 actuators used for?

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.

What's the difference between 657 and 667 diaphragm actuators?

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. Read more...

Can a 667 valve be externally tubed?

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.


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