Emerson Fisher 667NS Instruction Manual
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Emerson Fisher 667NS Instruction Manual

Emerson Fisher 667NS Instruction Manual

Diaphragm actuators size 40, 45, 70, and 80
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Instruction Manual
D102603X012
Fisher
667NS Diaphragm Actuators
™
Contents
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Introduction

Scope of Manual

This manual provides installation, maintenance, and parts list information for the Fisher 667NS actuator. Refer to
separate instruction manuals for information regarding the control valve and accessories.
Do not install, operate, or maintain 667NS 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
proceeding.

Description

The 667NS actuator is a reverse-acting, spring-opposed diaphragm actuator that is used for operation of automatic
control valves. The 667NS actuator yoke construction and special bonnet-to-yoke bolting provides a high structural
resonant frequency that exceeds most nuclear service seismic requirements.
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667NS Actuator
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Summary of Contents for Emerson Fisher 667NS

  • Page 1: Table Of Contents

    Introduction Scope of Manual This manual provides installation, maintenance, and parts list information for the Fisher 667NS actuator. Refer to separate instruction manuals for information regarding the control valve and accessories. Do not install, operate, or maintain 667NS actuators without being fully trained and qualified in valve, actuator, and accessory installation, operation, and maintenance.
  • Page 2 Instruction Manual 667NS Actuator June 2018 D102603X012 Table 1. Fisher 667NS Specifications ACTUATOR SIZE SPECIFICATION 1419 see table 5 Nominal Effective Diaphragm Area Inch see table 5 Yoke Boss Diameters Inch 2‐13/16 2‐13/16 3‐9/16 12.7 12.7 19.1 25.4 & 31.8...

  • 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 667NS diaphragm actuator, as well as a variety of other products, contact:...

  • Page 4: Installation

    Instruction Manual 667NS Actuator June 2018 D102603X012 D Maximum Excess Diaphragm Pressure: Additional pressure may be added when the actuator is at full travel. If the Maximum Excess Diaphragm Pressure is exceeded, damage to the diaphragm or diaphragm casing might result. Because the actuator has traveled its specified travel, and the diaphragm head is physically stopped from movement, the energy from any additional air pressure is transmitted to the diaphragm and diaphragm casings.

  • Page 5: Actuator Mounting

    Instruction Manual 667NS Actuator D102603X012 June 2018 If the actuator and control valve body are separate, mount the 667NS actuator on the valve body by following the procedures in the Actuator Mounting section of this manual. Actuator Mounting Direct‐Acting (Push‐Down‐to‐Close) Valves Refer to figure 1.

  • Page 6: Reverse-Acting (Push-Down-To-Open) Valves

    Instruction Manual 667NS Actuator June 2018 D102603X012 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. If necessary, increase actuator loading pressure slightly to allow the valve stem, actuator stem, and stem connector threads to match.
  • Page 7 Instruction Manual 667NS Actuator D102603X012 June 2018 Figure 1. Schematic and Stem Connection Details for Fisher 667NS SPRING ADJUSTOR YOKE SPRING PUSHES LIFTS STEM DOWN CONNECTOR TRAVEL TRAVEL INDICATOR INDICATOR DISK STEM LOCKNUTS VALVE STEM SIZES 40 AND 45 55A9191‐H A3833‐A...

  • Page 8: Loading Connection

    Instruction Manual 667NS Actuator June 2018 D102603X012 7. Increase actuator loading pressure to the upper end of the bench range and check to be sure that the mark on the actuator stem is in line with the top mark on the travel indicator scale. If the marks are in line, the actuator is properly bench set.

  • Page 9: Adjustments

    Instruction Manual 667NS Actuator D102603X012 June 2018 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 10: Adjustment Steps

    Instruction Manual 667NS Actuator June 2018 D102603X012 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. For an assembled valve‐actuator assembly, determine valve friction as described below: 1.

  • Page 11: Operation

    Instruction Manual 667NS Actuator D102603X012 June 2018 3. For sizes 40 through 70, turn the spring adjustor (key 74, figure 2 or 3) into the yoke to shift the span up or turn the spring adjustor out of the yoke to shift the span down. For size 80, remove the cap screw (key 91, figure 4) and remove the adjusting screw cover (key 84);...

  • Page 12: Replacement Of The Elastomeric Parts

    Instruction Manual 667NS Actuator June 2018 D102603X012 All maintenance operations can be performed with the valve in the line. WARNING Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. Before performing any maintenance operations: D Do not remove the actuator from the valve while the valve is still pressurized.

  • Page 13: Size 80 Actuators

    Instruction Manual 667NS Actuator D102603X012 June 2018 6. Install three new O‐rings (keys 8 and 9) on the seal bushing. 7. Lubricate the O‐rings, and fill the seal bushing with lithium grease (key 99) or high‐temperature, radiation‐resistant, polyphenyl ether grease (key 100), as appropriate to the installation and install the bushing in the top of the actuator yoke assembly (key 73).

  • Page 14: Disassembly

    Instruction Manual 667NS Actuator June 2018 D102603X012 Disassembly 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. Bypass the control valve. Reduce the actuator loading pressure to atmospheric pressure, and remove the tubing or piping from the connection in the yoke cap (key 239).

  • Page 15: Assembly

    Instruction Manual 667NS Actuator D102603X012 June 2018 12. Unbolt the lower diaphragm casing cap screws (key 30), and lift the lower diaphragm casing (key 64) and gasket (key 96) off the actuator yoke. 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.

  • Page 16: Size 80 Actuators

    Instruction Manual 667NS Actuator June 2018 D102603X012 9. Tighten the remaining hex nuts in a clockwise, criss‐cross pattern to 27 NSm (20 lbfSft). 10. After the last hex nut is tightened to 27 NSm (20 lbfSft), all of the hex nuts should be tightened again to 27 NSm (20 lbfSft) in a circular pattern around the bolt circle.
  • Page 17 Instruction Manual 667NS Actuator D102603X012 June 2018 CAUTION Overtightening the diaphragm casing cap screws and nuts can damage the diaphragm. Do not exceed the following maximum torque values for the appropriate diaphragm material: EPDM/Meta-Aramid: 95 NSm (70 lbfSft); Nitrile, Silicone, FKM (fluorocarbon) / Meta-Aramid: 68 NSm (50 lbfSft). Note Do not use lubricant on these cap screws and nuts.

  • Page 18: Parts Ordering

    Local Business Partner regarding replacement parts or technical information. WARNING Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Automation Solutions should not, under any circumstances, be used in any Fisher valve, because they may void your warranty, might adversely affect the performance of the valve, and could cause personal injury and property damage.
  • Page 19 Instruction Manual 667NS Actuator D102603X012 June 2018 Description Description  96* Gasket, composition/nitrile  83 Washer, steel (2 req'd), size 70 only  97 Guide Bushing, brass  98 Machine Screw, pl steel (2 req'd)  99 Lithium grease (not furnished with actuator) High‐temperature, radiation‐resistant, Note    polyphenyl ether grease (not furnished with actuator) Key numbers 84 through 98 are for size 80 only.
  • Page 20 Instruction Manual 667NS Actuator June 2018 D102603X012 Figure 2. Size 40 or 45 Fisher 667NS Actuator APPLY LUB 55A9191‐H...
  • Page 21 Instruction Manual 667NS Actuator D102603X012 June 2018 Figure 3. Size 70 Fisher 667NS Actuator APPLY LUB 55A9193‐F...
  • Page 22 Instruction Manual 667NS Actuator June 2018 D102603X012 Figure 4. Size 80 Fisher 667NS Actuator APPLY LUB 56A1032‐D...
  • Page 23 Instruction Manual 667NS Actuator D102603X012 June 2018...
  • Page 24 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 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.

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