Emerson Fisher 8540 Instruction Manual Download Page 8

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Instruction Manual

D104709X012

8540 Valve

September 2021

Figure 5. Optional Shaft-to-Valve Body Bonding Strap Assembly

GH14001

VIEW A-A

VALVE BODY

ACTUATOR MOUNTING BRACKET

Maintenance

Valve parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of inspection
and replacement depends upon the severity of service conditions. Instructions are given in this section for replacing
packing, seal ring, disk, shaft, bearings, and other valve parts. Also, instructions are provided for changing valve action,
mounting, and adjusting the actuator. Refer to the actuator instruction manual for additional information for
mounting and adjusting the actuator.

WARNING

Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. Before performing
any maintenance operations:

Do not remove the actuator from the valve while the valve is still pressurized.

Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal

injury.

Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the

actuator cannot suddenly open or close the valve.

Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure

from both sides of the valve. Drain the process media from both sides of the valve.

Vent the pneumatic actuator loading pressure and relieve any actuator spring precompression.

Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.

The valve packing box may contain process fluids that are pressurized,

even when the valve has been removed from the

pipeline.

Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when

loosening the packing box pipe plug.

Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

It is possible to damage the valve if the actuator travel stops are not properly adjusted before stroking the valve.

Summary of Contents for Fisher 8540

Page 1: ...separate instruction manuals for information covering the actuator and accessories Do not install operate or maintain 8540 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 caut...

Page 2: ...Weights See table 2 1 The pressure temperature limits in this manual and any applicable standard or code limitation for valves should not be exceeded Table 2 Valve Size Shaft Diameter and Approximate Weight VALVE SIZE NPS CLASS SHAFT DIAMETER APPROXIMATE WEIGHT Wafer Style mm Inches kg Pounds 3 150 12 7 1 2 4 5 10 300 15 9 5 8 5 9 13 4 150 15 9 5 8 8 6 19 300 19 1 3 4 10 23 6 150 19 1 3 4 13 29 30...

Page 3: ...ility of valve materials with process media rests solely with the purchaser and end user To avoid possible personal injury and because some valve trim material combinations are limited in their pressure drop and temperature ranges do not apply any other conditions to the valve without first contacting your Emerson sales office Table 3 Construction Material Temperature Limits 1 COMPONENTS AND MATER...

Page 4: ...h pressure should be applied to a specific side of the disk to provide best performance and optimal valve life see seal types below See figure 2 The PTFE soft seal is bi directional under normal operating conditions can at different times experience pressure in both directions the highest of the two pressures should be exerted on the preferred side of the disk If the two pressures are equal then t...

Page 5: ...50 CL300 No of Stud Bolts Size Dia Inch Thread A Dimension Inch No of Stud Bolts Size Dia Inch Thread A Dimension Inch 3 4 5 8 11 5 75 8 3 4 10 6 5 4 8 5 8 11 6 8 3 4 10 7 6 8 3 4 10 6 5 12 3 4 10 7 5 8 8 3 4 10 7 12 7 8 9 9 10 12 7 8 9 8 16 1 8 10 12 12 7 8 9 8 5 16 1 1 8 8 11 1 Thread engagement in accordance with ASME B31 3 Figure 4 Stud Bolts for Installation also see table 5 A3887 STUD BOLT ...

Page 6: ...For Fail Open Actuators It will be necessary to provide a temporary loading pressure to the actuator diaphragm to move the valve disk to the closed position Observe the above Warning when closing the valve If a loading pressure is required use caution when working with the valve If the loading pressure is disconnected the disk will open rapidly 2 With the disk in the closed position install line f...

Page 7: ...cking will accelerate wear and could produce higher rotating friction loads on the valve stem If necessary refer to the Packing Maintenance section WARNING The valve drive shaft is not necessarily grounded to the pipeline when installed Personal injury or property damage could result from an explosion caused by a discharge of static electricity from the valve components if the process fluid or the...

Page 8: ...nd eyewear when performing any maintenance operations to avoid personal injury D Disconnect any operating lines providing air pressure electric power or a control signal to the actuator Be sure the actuator cannot suddenly open or close the valve D Use bypass valves or completely shut off the process to isolate the valve from process pressure Relieve process pressure from both sides of the valve D...

Page 9: ... measures stay in effect while you work on the equipment 2 Note the position of the mark on the end of the valve shaft and its relationship to the actuator shaft 3 Remove the actuator per instructions in separate actuator instruction manuals then remove the cap screws key 14 figure 5 Remove the clamp if the strap is used 4 Remove the packing nuts key 101 and packing follower key 114 For NPS12 CL30...

Page 10: ...Instruction Manual D104709X012 8540 Valve September 2021 10 Figure 6 Typical Packing Arrangement PACKING FOLLOWER PACKING SET PACKING BOX RING PTFE V RING PACKING C0785 A ...

Page 11: ...e nuts just enough to stop the leak CAUTION Use caution when tightening the nuts Overtightening the nuts can damage packing box parts and result in increased drive shaft friction Seal Ring Maintenance Perform this procedure if the control valve is not shutting off properly if it is leaking downstream It is recommended but not required to remove the actuator for easier handling of the valve during ...

Page 12: ...g down Note Position blocks so they do not restrict the retainer ring removal D Rotate the disk to the open position as shown in figure 7 D Locate one of the knock out points machined on the retainer ring Using a hammer and flat end punch the knock out point pop out the retainer ring from the valve body CAUTION When popping out the retainer ring be very careful to hit only the knock out points Hit...

Page 13: ...al ring or other component parts Note PTFE NOVEX and Phoenix Ill seal rings used in other valve types are not interchangeable with seal rings used in the 8540 valve The 8540 seal rings are not interchangeable with seal rings in any other valve type To order seal rings for this valve provide the serial number on the valve 1 Installing PTFE seal rings a The valve disk should be open while installing...

Page 14: ...etainer ring surfaces when installing the ring e The retainer ring is properly seated when the face of the retainer ring is flush with the face of the valve body f To ensure proper seal performance for metal seals you may need to use the hammer to drive the disk open for the first few times When closing the valve use the C clamps discussed in the next few steps CAUTION Do not damage the gasket sea...

Page 15: ...a flat working surface with the seal ring slot facing down 5 Use blocks to raise the valve body high enough to allow the disk to be rotated to the fully open position see figure 8 6 Rotate the disk key 3 to the fully open position 7 Locate the small ends of the taper pins Drive the two taper pins key 10 out towards the larger end of the pins Note Attempting to drive the taper pins in the opposite ...

Page 16: ... figure 11 Figure 10 Orientation of Bearing Spacer Tab A6357 1 CENTER LINE OF SHAFT BORE CENTER L INE OF BODY AND DISK SPACER DISK STOP BEARING TAB OR DISK SPACER TAB 5 Rotate the disk to the open position On the end of the drive shaft locate the disk position mark on the end of the drive shaft Rotate the shaft until it is in the appropriate disk position as shown in figure 11 Note Make sure the t...

Page 17: ...Inch 1 2 0 154 1 12 0 25 0 165 5 8 0 181 1 50 0 31 0 192 3 4 0 202 1 75 0 36 0 213 1 0 275 2 34 0 50 0 286 1 1 4 0 374 3 00 0 75 0 385 1 1 2 0 426 3 50 0 75 0 437 1 3 4 0 487 4 50 0 88 0 498 Table 7 Installation Tool Dimensions SHAFT DIAMETER jA jB jC D E mm 12 7 12 7 3 68 6 35 127 0 4 83 15 88 12 7 4 57 7 62 127 0 4 83 19 05 12 7 5 23 8 89 127 0 4 83 25 4 12 7 7 00 10 41 127 0 4 83 31 75 19 05 10...

Page 18: ...is rotating counterclockwise to open when viewed from the actuator side of the valve and that the disk is not rotated beyond its limits 1 Orientate the valve drive shaft correctly to match the actuator or handlever position and install it into the actuator and actuator lever arm until the mounting pads mate with each other 2 Tighten the actuator mounting cap screws to the appropriate bolt torque f...

Page 19: ...the disk to the fully closed position at the end of the actuator stroke If necessary refer to the appropriate actuator instruction manual for assistance 5 If using a manual handwheel or handlever actuator refer to the appropriate actuator instruction manual for mounting positions and adjustments 6 To determine the fully closed disk position zero degrees of disk rotation measure the distances betwe...

Page 20: ...Spring 6 Bearing 2 req d 8 Drive Shaft 9 Hollow Pin 10 Taper Pin 18 Mfg Label 19 Drive Screw w nameplate 21 Nameplate 22 Lead Seal Wire not shown 23 Bottom Cap 12 inch only 24 Bottom Cap Stud 12 inch only 25 Bottom Cap Hex Nut 12 inch only 27 Bottom Cap Gasket 12 inch only 29 Flow Arrow 100 Packing Stud 2 req d 101 Packing Nut 2 req d 102 Packing Flange 105 Packing Set 107 Packing Box Ring 108 Pac...

Page 21: ...n Manual D104709X012 8540 Valve September 2021 21 Figure 12 Fisher 8540 Valve Assembly NOTE KEYS 21 22 28 AND 115 ARE NOT SHOWN PTFE PACKING GH13521 PTFE SEAL NPS 12 CL300 TWO PIECE FOLLOWER VIEW B VIEW B 34B5064 ...

Page 22: ...Instruction Manual D104709X012 8540 Valve September 2021 22 ...

Page 23: ...Instruction Manual D104709X012 8540 Valve September 2021 23 ...

Page 24: ...hich are available upon request We reserve the right to modify or improve the designs or specifications of such products at any time without notice Neither Emerson Emerson Automation Solutions nor any of their affiliated entities assumes responsibility for the selection use or maintenance of any product Responsibility for proper selection use and maintenance of any product remains solely with the ...

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