Fisher® 657 and 667 

Fisher® 657 and 667 spring-opposed diaphragm actuators position the valve plug in the valve in response to varying controller or valve positioner pneumatic output signals applied to the actuator diaphragm. Zero setting of the actuator is determined by the compression of the actuator spring. Span is set by both the actuator spring rate and the number of springs available. The 657 actuator is direct-acting; the 667 is reverse-acting. These actuators are designed to provide dependable on-off or throttling operation of automatic control valves.
DocumentationFeatures & BenefitsSpecifications
 Product & Service Documentation
 Data Sheets - Bulletins - Catalogs
 Fisher® 657 and 667 Diaphragm Actuators
856 KBpdfMay 2012K
 Manuals & Guides
 Fisher® 657 Diaphragm Actuator Sizes 30-70 and 87
573 KBpdfNovember 2013N
 Fisher® 657 Diaphragm Actuators Size 80 and 100
323 KBpdfDecember 2010K
 Fisher® 667 Diaphragm Actuator Sizes 30-76 and 87
723 KBpdfNovember 2013P
 Fisher® 667 Diaphragm Actuators Size 80 and 100
355 KBpdfMay 2011J
Fisher 657 and 667
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