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Instruction Manual
D102602X012
Fisherr 657NS Diaphragm Actuators
Size 40, 45, 70, and 80
Contents
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Introduction
Scope of Manual
This manual provides installation, maintenance, and parts list information 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 the contents of this manual, including all safety cautions and warnings. If you
have any questions about these instructions, contact your Emerson Process Management sales office before
proceeding.
Description
The 657NS actuator is a direct-acting, spring-opposed diaphragm actuator used for operation of automatic control
valves. The 657NS actuator yoke construction and special yoke-to-bonnet bolting provides a high structural resonant
frequency that exceeds most nuclear service seismic requirements.
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Size 80 Actuators
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657NS Actuator
November 2012
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Table of Contents
Related Manuals for Emerson FISHER 657NS
Summary of Contents for Emerson FISHER 657NS
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Page 1: Table Of Contents
Introduction Scope of Manual This manual provides installation, maintenance, and parts list information 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. - Page 2 Instruction Manual 657NS Actuator November 2012 D102602X012 Table 1. Fisher 657NS Specifications ACTUATOR SIZE SPECIFICATION 1419 see table 3 Nominal Effective Area Inch see table 3 Yoke Boss Diameters Inch 2-13/16 2-13/16 3-9/16 12.7 12.7 19.1 25.4 & 31.8 Acceptable Valve Stem Diameters Inch 1 &...
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Page 3: Specifications
To avoid personal injury or property damage, do not exceed pressure and temperature limits specified in table 1. Educational Services For information on available courses for the Fisher 657NS diaphragm actuator, as well as a variety of other products, contact:... -
Page 4: Actuator Mounting
Instruction Manual 657NS Actuator November 2012 D102602X012 The control valve assembly normally may be installed in any orientation; however, the assembly must not be installed so that water can collect in the actuator yoke and lower diaphragm casing areas. Note The 657NS actuator will not mount on a standard valve bonnet;... -
Page 5: Reverse-Acting (Push-Down-To-Open) Valves
Instruction Manual 657NS Actuator D102602X012 November 2012 Note Replacement stem connectors are an assembly of two stem connector halves, cap screws, and a spacer between the connector halves. Remove the spacer, if present, before clamping the stems together. 9. Push the valve stem firmly against its seat, and be sure that it remains firmly against the seat. Clamp the actuator stem and valve stem between the two stem connector halves. -
Page 6: Loading Connection
Instruction Manual 657NS Actuator November 2012 D102602X012 CAUTION Incomplete engagement of the valve stem and/or actuator stem in the stem connector can result in stripped threads or improper operation. Be sure that the length of each stem clamped in the stem connector is equal to or greater than the diameter of that stem. - Page 7 Instruction Manual 657NS Actuator D102602X012 November 2012 Figure 1. Schematic and Stem Connection Details for Fisher 657NS PUSHES DOWN SPRING ADJUSTOR STEM SPRING CONNECTOR LIFTS YOKE TRAVEL INDICATOR DISK TRAVEL INDICATOR VALVE STEM 45A9190-D SIZES 40 AND 45 AF3833-A SCHEMATIC...
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Page 8: Adjustments
Instruction Manual 657NS Actuator November 2012 D102602X012 Adjustments Travel WARNING When moving the actuator stem with diaphragm loading pressure, use caution to keep hands and tools out of the actuator stem travel path. Personal injury and/or property damage is possible if something is caught between the actuator stem and other control valve assembly parts. -
Page 9: Bench Set Adjustments
Instruction Manual 657NS Actuator D102602X012 November 2012 If you are adjusting to the bench set range after the actuator is connected to the valve and the packing tightened, you must take friction into account. Make the spring adjustment such that full actuator travel occurs at the bench set range (a) plus the friction force divided by the effective diaphragm area with increasing diaphragm pressure or (b) minus the friction force divided by the effective diaphragm area with decreasing diaphragm pressure. -
Page 10: Maintenance
Instruction Manual 657NS Actuator November 2012 D102602X012 is shown graphically in figure 1. In the event of failure of the loading pressure to the diaphragm of the actuator, the actuator stem moves to the extreme upward position. Thus, by the proper selection of the valve plug action, either push-down-to-close or push-down-to-open, the control valve will either close or open on failure of the loading pressure. -
Page 11: Replacement Of The Elastomeric Parts
Instruction Manual 657NS Actuator D102602X012 November 2012 D Use lock-out procedures to be sure that the above measures stay in effect while you work on the equipment. D The valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the pipeline. -
Page 12: Size 80 Actuators
Instruction Manual 657NS Actuator November 2012 D102602X012 8. After the last bolt is tightened to 27 NSm (20 lbfSft), all of the bolts should be tightened again to 27 NSm (20 lbfSft) in a circular pattern around the bolt circle. 9. -
Page 13: Assembly
Instruction Manual 657NS Actuator D102602X012 November 2012 diameter rod into a hole in the spring adjusting screw (key 12). Using the rod, turn the spring adjusting screw away from the diaphragm (key 2) to relieve all compression in the spring (key 6). 5. -
Page 14: Size 80 Actuators
Instruction Manual 657NS Actuator November 2012 D102602X012 CAUTION Overtightening the diaphragm casing cap screws and nuts (keys 22 and 23) can damage the diaphragm. Do not exceed a torque of 27 NSm (20 lbfSft) when performing this tightening procedure. Note Do not use lubricant on these cap screws and nuts. - Page 15 Instruction Manual 657NS Actuator D102602X012 November 2012 Table 6. Size 80 Casing Cap Screw Torque Values INITIAL TORQUE FINAL TORQUE DIAPHRAGM MATERIAL NSm (lbfSft) NSm (lbfSft) EPDM / Meta-Aramid 41 (30) 82±13 (60±10) Nitrile, Silicone, FKM/Meta-Aramid 34 (25) 68 (50) 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 material.
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Page 16: Parts Ordering
Emerson Process Management sales office regarding replacement parts or technical information. WARNING Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Process Management should not, under any circumstances, be used in any Fisher valve, because they may void your warranty, might adversely affect the... -
Page 17: Parts List
Instruction Manual 657NS Actuator D102602X012 November 2012 Parts List Description Description Hex Nut, pl steel Upper Diaphragm Casing, steel Size 40 (16 req'd) Size 45 (20 req'd) Size 40, 45, 70, and 80 Size 70 (28 req'd) W/top-mounted handwheel Size 80 (36 req'd) Size 40, 45, and 70 Twin Speed Nut, stainless steel Diaphragm, nitrile... - Page 18 Instruction Manual 657NS Actuator November 2012 D102602X012 Figure 2. Size 40 or 45 Fisher 657NS Actuator APPLY LUB 45A9090-D...
- Page 19 Instruction Manual 657NS Actuator D102602X012 November 2012 Figure 3. Size 70 Fisher 657NS Actuator APPLY LUB 55A9192-C...
- Page 20 Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user. 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, and the Emerson logo are trademarks and service marks of Emerson Electric Co.