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Instruction Manual
D103551X012
Fisher
EWNS Control Valve
™
Contents
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Introduction
Scope of Manual
This instruction manual includes installation, maintenance, and parts information for NPS 20x16 and NPS 22x16 EWNS
valves with CL900 ratings. Note: Applications requiring lower pressure class ratings may use the same casting as a
higher rated valve of the required size. Refer to separate manuals for instructions covering the actuator, positioner,
and accessories.
Do not install, operate, or maintain EWNS valves 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 sales office
Description
NPS 20X16 EWNS valves (figure 1) have schedule 120 buttweld end connections and NPS 22X16 EWNS valves have
schedule 140 buttweld end connections. EWNS valves are designed for use with a Fisher yoke and buyout piston
actuator and can also be used with Fisher 667NS2 and 657NS2 actuators. EWNS valves are designed to handle high
seismic environments.
Specifications
Specifications for EWNS valves are shown in table 1.
www.Fisher.com
1
1
1
1
3
3
3
4
5
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6
7
7
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8
12
13
17
20
20
before proceeding.
Figure 1. EWNS Valve with Piston Actuator
EWNS Valve
March 2022
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Table of Contents
Related Manuals for Emerson Fisher EWNS
Summary of Contents for Emerson Fisher EWNS
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Page 1: Table Of Contents
If you have any questions about these instructions, contact your Emerson sales office before proceeding. Description NPS 20X16 EWNS valves (figure 1) have schedule 120 buttweld end connections and NPS 22X16 EWNS valves have schedule 140 buttweld end connections. - Page 2 1. The pressure or temperature limits in this manual and any applicable standard limitations should not be exceeded. 2. EN (or other) ratings and other BWE can usually be supplied; consult your Emerson sales office. 3. May be used flow up as required by design.
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Page 3: Educational Services
Instruction Manual EWNS Valve D103551X012 March 2022 Educational Services For information on available courses for the Fisher EWNS valve, as well as a variety of other products, contact: Emerson Automation Solutions Educational Services - Registration Phone: 1-641-754-3771 or 1-800-338-8158 E-mail: education@emerson.com emerson.com/fishervalvetraining... -
Page 4: Installation
Instruction Manual EWNS Valve March 2022 D103551X012 CAUTION Care must be taken when lifting the valve/actuator assembly to ensure all accessories and tubing are not damaged in the process. Accessories and tubing may need to be removed prior to lifting to prevent damage and properly reinstalled before use. -
Page 5: Maintenance
Shrink‐fit pieces and threaded connections might also loosen. In general, if post‐weld heat treating is needed, remove all trim parts. Contact your Emerson sales office for additional information. 4. Install the valve in the line. Use accepted piping and welding practices when installing the valve in the pipeline. -
Page 6: Bonnet Nut Torquing Considerations
Instruction Manual EWNS Valve March 2022 D103551X012 WARNING Avoid personal injury or damage to property from sudden release of pressure or uncontrolled process fluid. Before starting disassembly: D Do not remove the actuator from the valve while the valve is still pressurized. D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal injury. -
Page 7: Packing Lubrication
Instruction Manual EWNS Valve D103551X012 March 2022 Figure 2. Procedure to Prevent Marring of Bonnet Nuts During Assembly HYDRAULIC TORQUE WRENCH REQUIRED SOCKET REACTION ARM EXTRA TOOLING TO PROTECT THE ADJACENT NUT X0644 Packing Lubrication Note No provisions for packing lubrication. WARNING Do not lubricate any parts or surfaces that may come into contact with the process media. -
Page 8: Replacing High-Seal Packing
Instruction Manual EWNS Valve March 2022 D103551X012 Replacing HIGH-SEAL Packing WARNING Refer to the WARNING at the beginning of the Maintenance section in this instruction manual. Key numbers referred to in this procedure are shown in figure 3 or 9, unless otherwise indicated. 1. - Page 9 Instruction Manual EWNS Valve D103551X012 March 2022 WARNING To avoid personal injury or property damage caused by uncontrolled movement of the bonnet (key 10), loosen the bonnet by following the instructions in the next step. Do not remove a stuck bonnet by pulling on it with equipment that can stretch or store energy in any other manner.
- Page 10 Personal injury or damage to equipment could occur if improper stud and nut materials or parts are used. Do not operate or assemble this product with stud(s) and nut(s) that are not approved by Emerson/Fisher engineering and/or listed on the serial card provided with this product.
- Page 11 Instruction Manual EWNS Valve D103551X012 March 2022 Figure 4. Installing Graphite Ribbon/Filament Packing Rings One at a Time VALVE STEM PACKING FOLLOWER BONNET TOP OF PACKING RING EVEN WITH BOTTOM OF ENTRANCE CHAMFER INSTALLING INSTALLING FIRST PACKING RING SECOND PACKING RING A2207‐2 18.
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Page 12: Trim Removal
Instruction Manual EWNS Valve March 2022 D103551X012 Figure 5. Bolting Diagram Figure 6. Typical Load Scale STEM SIZE MAXIMUM SPRING LOAD MINIMUM SPRING LOAD ZERO SPRING LOAD (PACKING NUTS FINGER‐TIGHT) A4990‐2 22. Lubricate the packing nuts (key 14) with Nuclear Grade anti-seize lubricant (key 27) and tighten them hand‐tight. 23. -
Page 13: Trim Replacement
Instruction Manual EWNS Valve D103551X012 March 2022 CAUTION Use care to avoid damaging gasket surfaces. The surface finish of the valve stem (key 4) is critical for making a good packing seal. The inside surface of the cage or cage assembly (key 2) is critical for smooth operation of the valve plug and for making a seal with the bidirectional anti-extrusion seal rings (key 31). - Page 14 Instruction Manual EWNS Valve March 2022 D103551X012 CAUTION Inspect the cage (key 2), bonnet (key 10), and body gasket seating surfaces. These surfaces must be in good condition, with all foreign material removed. Small burrs less than approximately 0.076 mm (0.003 inches) in height (the thickness of a human hair) can be ignored.
- Page 15 Personal injury or damage to equipment could occur if improper stud and nut materials or parts are used. Do not operate or assemble this product with stud(s) and nut(s) that are not approved by Emerson/Fisher engineering and/or listed on the serial card provided with this product.
- Page 16 Instruction Manual EWNS Valve March 2022 D103551X012 Figure 7. Seat Ring Using Bidirectional Seal Rings Figure 8. Plug Using Bidirectional Seal Rings...
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Page 17: Troubleshooting
Instruction Manual EWNS Valve D103551X012 March 2022 Troubleshooting Table 5. Fisher EWNS Valve Troubleshooting Problem Possible Solution Verify the correct packing torque or compression. Disassemble and inspect packing box bore and valve stem for graphite adhesion, excessive wear or scratches. - Page 18 Instruction Manual EWNS Valve March 2022 D103551X012 Figure 9. NPS 20x16 and NPS 22x16 EWNS Valve APPLY LUB GE52555-B...
- Page 19 Instruction Manual EWNS Valve D103551X012 March 2022 Figure 10. EWNS Valve Configuration NPS 20X16 AND 22X16 EWNS BIDIRECTIONAL ANTI-EXTRUSION SEAL TRIM...
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Page 20: Parts Ordering
WARNING Use only genuine Fisher replacement parts. Components that are not supplied by Emerson 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 21 Ring, Key 11 following table Related the expected life of the valve. Emerson degrade over recommends replacing this component every 6 time. years or as needed due to individual valve operation and performance.
- Page 22 Cycled parts will exhibit wear over time. Based on Does not exhibit Backup Ring Refer to Non-Safety experience and testing, Emerson recommends a tendency to (plug), following table Related replacing this component every outage to maintain degrade over Key 29 performance, or at least every 3 years.
- Page 23 Instruction Manual EWNS Valve D103551X012 March 2022 Table 7. Keys 9, 11*, 12*, 13*, 14, 15, 16*, 17, 18, 19, 20, 21, 22, and 34* Packing Components VALVE STEM SIZE PACKING COMPONENT QUANTITY PACKING STYLE NUMBER 31.75 mm (1-1/4-Inch) Packing Flange PTFE HIGH-SEAL 21B2199X012 Packing Box Ring...
- 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.