Product Bulletin Fisher™ 656 Diaphragm Actuator The Fisher 656 actuator is a bracket-mounted, direct-acting, diaphragm actuator for either throttling or on-off service. Principal applications include operation of butterfly valves and built-in turbine valves, louvers, dampers, and other similar equipment. Mounting Versatility—Four tapped holes in the actuator base permit either bracket or plate mounting. Long Actuator Travel—Deep casings provide up to 105 mm (4.125 inches) of maximum travel with a size 60 actuator. Application Versatility—Wide spring selection is available for nearly any control application. Spring selection procedures are quick and accurate. TRAVEL STOP Severe Service Capability—Rugged yoke and casings provide stability and corrosion resistant protection. ADJUSTING SCREW SPRING SEAT BEARING BEARING SEAT Installation The actuator may be installed in any position. Dimensions are shown in figure 1. TYPICAL CONSTRUCTION

Product Bulletin 61.1:656 September 2017 ■ -40 to 82°C (-40 to 180°F) with Nitrile Elastomer ■ -40 to 149°C (-40 to 300°F) with Silicone Diaphragm Top-mounted handwheel/adjustable travel stop 1. Control and stability may be impaired if this pressure is exceeded. 2. Exceeding this pressure can cause damage to the diaphragm, diaphragm casing, or otherparts. 3. For fluid and temperature capabilities ofoptional materials, consult your Emerson sales office or Local Business Partner. 4. The pressure/temperature limits in this bulletin and any applicable standard or code limitation for valve should...

61.1:656 September 2017 Table 1. Stem Force Output and Other Actuator Data

mm(INCH) Table 3. Dimensions CD Duplicated on opposite side: each hole 5/16-18 UNC-2B tapped 13 (0.50) deep. Fisher is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners. The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees,...