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Instruction Manual

D102602X012

657NS Actuator

November 2012

7

Figure 1. Schematic and Stem Connection Details for Fisher 657NS

AF3833-A

45A9190-D

55A9192-C

55A1030-C

A5959/MM1

C0761

AIR

PUSHES

DOWN

SPRING

LIFTS

SCHEMATIC

SIZES 40 AND 45

YOKE

TRAVEL

INDICATOR

SPRING

ADJUSTOR

STEM

CONNECTOR

TRAVEL

INDICATOR

DISK

VALVE

STEM

YOKE

YOKE

YOKE

TRAVEL

INDICATOR

TRAVEL

INDICATOR

SPRING

ADJUSTOR

TRAVEL

INDICATOR

DISK

STEM

CONNECTOR

STEM

CONNECTOR

VALVE

STEM

VALVE

STEM

SIZE 70

SIZE 80

STEM CONNECTION

DETAILS

STEM

LOCKNUTS

TRAVEL

INDICATOR

POINTER

NPT INTERNAL

CONNECTION

DIAPHRAGM

CASING

ACTUATOR

VALVE

STUDS

AND NUTS

FISHER

DBQ-NS

VALVE

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Summary of Contents for FISHER 657NS

Page 1: ...ion for the Fisher 657NS actuator Refer to separate instruction manuals for information regarding the control valve and accessories Do not install operate or maintain 657NS actuators without being fully trained and qualified in valve actuator and accessory installation operation and maintenance To avoid personal injury or property damage it is important to carefully read understand and follow all ...

Page 2: ...diaphragm casing pressure may be used only when maximum allowable stem forces are not exceeded 3 The pressure and temperature limitations in this manual and any applicable code limitation should not be exceeded Table 2 Diaphragm Casing Volumes cm3 Inch3 ACTUATOR SIZE CLEARANCE VOLUME cm3 INCH3 TRAVEL mm INCH 11 0 4375 16 0 625 19 0 75 29 1 125 38 1 5 51 2 76 3 40 934 57 1475 90 1704 104 1852 113 2...

Page 3: ... education emerson com Installation The diaphragm actuator is normally shipped mounted on a valve body Follow the valve body instructions when installing the control valve in the pipeline WARNING Always wear protective gloves clothing and eyewear when performing any installation operations to avoid personal injury Check with your process or safety engineer for any additional measures that must be ...

Page 4: ...ion 6 With the travel indicator scale attached to the actuator yoke make a temporary mark on the actuator stem at a point parallel with the top mark on the travel indicator scale This is the fully open position 7 Refer to the actuator nameplate to determine the bench set pressure range of the actuator Apply the lower bench set pressure to the actuator and turn the spring adjustor until the actuato...

Page 5: ...e stem down to open the valve 3 Lift or hoist the actuator onto the valve bonnet 4 Insert the cap screws and tighten the hex nuts not shown securing the actuator to the bonnet Tighten the cap screws to the torque shown in table 5 5 Apply actuator loading pressure until the actuator is at the full down position 6 With the travel indicator scale attached to the actuator yoke make a temporary mark on...

Page 6: ...ough 70 only For all sizes thread the stem locknuts against the stem connector 12 Remove all loading pressure Move the travel indicator scale so that the indicator disk or pointer is in line with the top mark of the travel indicator scale 13 Check the valve travel to be sure that the valve travels fully with no overtravel Loading Connection 1 Connect the loading pressure piping to the NPT internal...

Page 7: ...MATIC SIZES 40 AND 45 YOKE TRAVEL INDICATOR SPRING ADJUSTOR STEM CONNECTOR TRAVEL INDICATOR DISK VALVE STEM YOKE YOKE YOKE TRAVEL INDICATOR TRAVEL INDICATOR SPRING ADJUSTOR TRAVEL INDICATOR DISK STEM CONNECTOR STEM CONNECTOR VALVE STEM VALVE STEM SIZE 70 SIZE 80 STEM CONNECTION DETAILS STEM LOCKNUTS TRAVEL INDICATOR POINTER NPT INTERNAL CONNECTION DIAPHRAGM CASING ACTUATOR VALVE STUDS AND NUTS FIS...

Page 8: ...amage to the valve packing might result 2 Tighten the locknuts together using a wrench then screw the valve stem either into the stem connector to lengthen travel or out of the stem connector to shorten travel 3 Cycle the actuator to check the travel If actual travel is not equal to the specified travel adjust and check travel until correct Tighten the stem connector cap screws when correct travel...

Page 9: ... diaphragm pressure readings at a travel position other than mid travel if you desire If you take readings at the zero or at the full travel position ensure that the readings are taken when the travel just begins or just stops at the position selected The spring adjustor is difficult to rotate Release the loading pressure before adjusting then re apply loading pressure to check the adjustment Benc...

Page 10: ...e valve were set on the work bench However in service with the specified pressure drop applied across the valve it should stroke over the diaphragm pressure operate range indicated on the nameplate When the control valve and actuator are installed the actuator should be checked for correct travel freedom from excessive friction and correct action air to open or air to close to match the controllin...

Page 11: ...ng or piping from the top of the upper diaphragm casing key 1 2 Remove the diaphragm casing cap screws and nuts keys 22 and 23 and lift off the upper diaphragm casing 3 Take out the diaphragm key 2 and install a new one Note When you replace actuator diaphragms in the field take care to ensure the diaphragm casing cap screws are tightened to the proper load to prevent leakage but not crush the mat...

Page 12: ...separating the stem connector key 26 and removing the eight bonnet stud bolt nuts Separate the stem connector by loosening the stem hex nuts keys 15 and 16 and unscrewing the two cap screws 4 Remove the diaphragm casing cap screws and nuts keys 22 and 23 and lift off the upper diaphragm casing key 1 5 Take out the molded diaphragm key 2 6 The diaphragm plate and actuator stem keys 4 and 10 can be ...

Page 13: ...diaphragm plate key 4 diaphragm key 2 and upper diaphragm plate key 48 off the actuator stem 13 Remove the cap screws key 8 that secure the lower diaphragm casing key 5 to the actuator yoke key 9 and remove the lower casing Assembly Size 40 45 and 70 Actuators Key number references are shown in figure 2 for size 40 and 45 actuators and in figure 3 for size 70 actuators 1 Apply lithium grease to th...

Page 14: ...ces are shown in figure 4 1 Place the lower diaphragm casing key 5 on the actuator yoke key 9 and secure them together with the cap screws key 8 Torque the screws evenly to 102 NSm 75 lbfSft using a crisscross pattern 2 Carefully slide the upper diaphragm plate key 48 the diaphragm key 2 and the diaphragm plate key 4 onto the actuator stem key 10 Thread the two hex nuts key 49 lightly against the ...

Page 15: ...degrees apart to the final torque value that is specified in table 6 for the diaphragm material being used 9 Tighten the remaining hex nuts in a clockwise crisscross pattern to the final torque value that is specified in table 6 for the diaphragm material being used 10 After the last hex nut is tightened complete another tightening sequence Tighten in a circular pattern around the bolt circle to t...

Page 16: ...n the stem is in the extreme upward position Thread the hex locknut key 50 against the spring case and lock it securely against the spring case 20 Mount the actuator and make the stem connection by following the procedure in the Actuator Mounting section Parts Ordering Each actuator has a serial number stamped on the nameplate Always refer to this serial number when corresponding with your Emerson...

Page 17: ... req d Size 70 28 req d Size 80 36 req d Key Description 23 Hex Nut pl steel Size 40 16 req d Size 45 20 req d Size 70 28 req d Size 80 36 req d 24 Twin Speed Nut stainless steel Size 70 only 25 Washer steel Size 45 and 70 26 Stem Connector Assembly stainless steel 28 Machine Screw pl carbon steel 2 req d Size 80 only 32 Washer steel 2 req d Size 70 only 33 Pipe Bushing pl steel Size 70 only Note ...

Page 18: ...Instruction Manual D102602X012 657NS Actuator November 2012 18 Figure 2 Size 40 or 45 Fisher 657NS Actuator 45A9090 D APPLY LUB ...

Page 19: ...Instruction Manual D102602X012 657NS Actuator November 2012 19 Figure 3 Size 70 Fisher 657NS Actuator APPLY LUB 55A9192 C ...

Page 20: ...rned by our terms and conditions which are available upon request We reserve the right to modify or improve the designs or specifications of such products at any time without notice E 1979 2012 Fisher Controls International LLC All rights reserved Fisher is a mark owned by one of the companies in the Emerson Process Management business unit of Emerson Electric Co Emerson Process Management Emerson...

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