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This instruction manual provides information on installation, adjustment, maintenance, and parts ordering for the Fisher 657 actuator in sizes 30 through 70 and This instruction manual provides information on installation, adjustment, maintenance, and parts ordering for the. Fisher 657 actuator in sizes 30/30i Fisher 657 and 667 spring-opposed diaphragm actuators position the valve plug in the valve in response to varying controller or valve positioner. Summary of Contents of user manual for Emerson Process Management fisher 657. Page 1 Instruction Manual Form 1900 February 2007 657 Actuator (30-70 and 87)Instruction Manual 657 Actuator (30/30i-70/70i and 87) D100306X012 June 2018 5. Screw the valve stem locknuts up against the stem connector for the size 87 This instruction manual provides information on installation, adjustment, maintenance, and parts ordering for the. Fisher 657 actuator in sizes 80 and 100.