Product Bulletin Fisher 657-667 Diaphragm Actuators

1 657 and 667 Diaphragm ActuatorsFisher 657 and 667 spring-opposed diaphragmactuators position the valve plug in the valve inresponse to varying controller or valve positionerpneumatic output signals applied to the actuatordiaphragm. Zero setting of the actuator is determinedby the compression of the actuator spring. Span is setby both the actuator spring rate and the number ofsprings available. The 657 actuator is direct-acting; the667 is reverse-acting. These Actuators are designed toprovide dependable on-off or throttling operation ofautomatic control Application Versatility Five actuator types in elevensizes are available for an extensive variety ofapplications.

2 Spring rates, travel stops, and manualoperators are available for nearly any control Excellent Linearity Between Loading Pressure andTravel A molded Diaphragm travels in a deepdiaphragm casing, minimizing area changethroughout the High Degree of Dynamic Stability and FrequencyResponse A shallow casing on the pressure sidemeans reduced volume on that side, therebyminimizing response High Thrust Capability The molded diaphragmallows maximum thrust for given Diaphragm Long Service Life Rugged thick-walled cast iron andsteel construction provides increased stability,corrosion protection.

3 And protection fromdeformation should over-pressurization ACTUATOR667 ACTUATORW2174-2W1916-3 Fisher 657 and 667 Actuators Mounted on easy-et Valvesn Cold Service Applications Enhanced productspecifications for all sizes of 657 and 667 diaphragmactuators allow performance to -50_C (-58_F). Useof a positioner is recommended to ensureresponsiveness in applications operating below-40_C (-40_F).n Positive Connections A split block stem connectionprovides a solid transfer of motion while allowingeasy mounting. The absence of linkages helps toavoid lost motion and inaccurate valve and 667 ActuatorsD100087X012 Product :657 September 2017657 and 667 ActuatorsD100087X012 Product :657 September 2017 2 SpecificationsStandard Operating Pressure Range(1)657 and 667: to bar (3 to 15 psig) or bar (6 to 30 psig)657-4 and 667-4: to bar (3 to 27 psig)667 size 76.

4 To bar (6 to 30 psig) or J0 bar (0 to 45 psig)Maximum TravelSee table 1 Output IndicationStainless steel disk or pointer and graduated scaleStroking SpeedDependent on actuator size , travel, spring rate, initialspring compression, and supply pressure. If strokingspeed is critical, consult your Emerson sales office orLocal Business Allowable Thrust(2)See table 1 Operating Temperature Range(1)Standard Construction (Nitrile Elastomers): -40 to82_C (-40 to 180_F)Optional Construction (Silicone Diaphragm ): -40 to149 C (-40 to 300 F)Maximum Valve Packing Box Temperature: 427_C(800_F) with cast iron yokeVolumetric DisplacementSee table 2 Signal ConnectionsSizes 30 - 60 and 667 size 76: 1/4 NPT internalSizes 70 and 87.

5 1/2 NPT internal with 1/4 NPTinternal bushingSize 80657: 3/4 NPT internal with 1/4 NPT internal bushing667: 1/2 NPT internal with 1/4 NPT internal bushingSize 100: 1 NPT internal with 1/4 NPT internal bushingEffective Diaphragm AreaSee table 1 Construction Materials (refer to figure 1) Diaphragm CasingSizes 30 - 87: SteelSize 80: JCast iron or JsteelSize 100: JCast aluminumDiaphragmSizes 30 - 87: JNitrile on nylon, JSilicone onpolyesterSize 100: Nitrile on polyesterDiaphragm Plate657 Sizes 30- 60, 100: JCast aluminum657 Sizes 70 - 87: JCast iron or Jsteel667 Sizes 30 - 60, 100: JCast aluminum or Jsteel667 Sizes 70 - 87: JCast iron or JsteelActuator Spring: SteelSpring Adjustor: SteelSpring Seat: JSteel or Jcast ironActuator Stem: SteelTravel Indicator: Stainless steelO-Rings: NitrileSeal Bushing: BrassStem Connector: Zinc-plated steelYokeSizes 30 - 80: J Cast iron or J steelSize 100.

6 Steel-continued-ContentsFeatures Configurations Action Action Travel Stops Information Specifications Casing Displacement actuator Weights(without handwheel) Capabilities Specifications Travel Stop Styles and 667 ActuatorsD100087X012 Product :657 September 2017 3 Specifications (continued)Construction Materials for Cold Service[to -50_C (-58_F)] 657 and 667--all sizesYoke: Steel (Grade LCC) Diaphragm : SiliconeO-Rings:(3) Ethylene PropyleneBolting: Stainless Steel B8M Cl 2 Stem Connector: Stainless SteelLubricant: SiliconeStem and Yoke Boss DiametersSee table 1 Approximate WeightSee table 3 Optional Safety Instrumented System ClassificationSIL3 capable - certified by exida Consulting LLCO ptionsJOversize signal connections, JPlastic yoke covers1.

7 The pressure and temperature limits in this Bulletin and in any applicable standard or code limitation should not be Do not exceed the thrust limits in this Includes Diaphragm casing seals, casing-mounted handwheel on 657, seal bushing on ConfigurationsDirect ActionAll 657 actuators are direct acting. Applying airpressure to the upper Diaphragm casing forces theactuator stem downward. When this pressure isreduced, the opposing spring force moves theactuator stem upward. Should the loading pressurefail, the spring forces the stem to the extreme upwardposition.

8 This provides fail-open action forpush-down-to-close valves and fail-closed action forpush-down-to-open A direct-acting actuator used on sliding-stemvalves. Available in sizes 30 through 100. See figures 1,2, 5, and A 657 actuator in sizes 70 and 87, designedwith 102 mm (4-inch) ActionAll 667 Actuators are reverse acting. Applying airpressure to the lower Diaphragm casing forces theactuator stem upward against the opposing springforce. When this loading pressure is reduced, thespring moves the actuator stem downward.

9 Shouldthe loading pressure fail, the spring forces the stem tothe extreme downward position. The actuatorsprovide fail-closed action for push-down-to-closevalves and fail-open action for A reverse-acting actuator used on sliding-stemvalves. Available in sizes 30 through 100 and 76. Seefigures 1, 2, and A 667 actuator in sizes 70 and 87, designedwith 102 mm (4-inch) and 667 ActuatorsD100087X012 Product :657 September 2017 4 AccessoriesHandwheelsHandwheels for Diaphragm Actuators are often used asadjustable travel stops.

10 They also provide a readymeans of positioning the control valve in anemergency. The specifications in tables 5 and 6 applyto handwheels on both 657 and 667 Series repeated or daily manual operation, the unitshould be equipped with a side-mounted Handwheels Typical 657 and 667actuators with handwheels mounted on thediaphragm case are shown in figure 2 (not available ona 667 actuator , size 80). On the 657 actuator , thehandwheel can be set to limit the travel in the upwarddirection; on the 667 actuator , travel in the downwarddirection can be restricted.