Emerson Fisher YD User manual

www.Fisher.com
Fisher™YD and YS 3‐Way Valves
Contents
Introduction 1.................................
Scope of Manual 1.............................
Specifications 2...............................
Educational Services 2.........................
Installation 3..................................
Maintenance 4.................................
Packing Lubrication 5..........................
Packing Maintenance 6.........................
Packing Replacement 6.....................
Trim Maintenance 7...........................
Disassembly 7.............................
Assembly 12..............................
ENVIRO‐SEALtBellows Seal Bonnet 16...........
Replacing a Plain or Extension Bonnet with an
ENVIRO‐SEAL Bellows Seal Bonnet
(Stem/Bellows Assembly) 16..............
Replacement of an Installed
ENVIRO‐SEAL Bellows Seal Bonnet
(Stem/Bellows Assembly) 18..............
Purging the ENVIRO‐SEAL
Bellows Seal Bonnet 19...................
Parts Ordering 24...............................
Parts Kits 24...................................
Gasket Kits 25.................................
Parts List 26...................................
YD and YS Valve 26............................
Bonnet for YD and YS 26........................
Figure 1. Fisher YD Valve with 667 Actuator
W2081
Introduction
Scope of Manual
This instruction manual includes installation, maintenance, and parts information for NPS 1/2 through 8 YD and NPS
1/2 through 6 YS control valves. Refer to separate manuals for instructions covering the actuators and accessories.
Do not install, operate, or maintain YD or YS 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 or Local Business Partner before
proceeding.
Instruction Manual
D100425X012
YD and YS Valves
July 2017

Instruction Manual
D100425X012
YD and YS Valves
July 2017
2
Table 1. Specifications
Valve Sizes, Ratings, and End Connections (1,2)
Cast Iron Valves
Flanged: NPS 1‐1/2 through 6 CL125 flat‐face or
CL250 raised‐face flanges per ASME B16.1
Screwed: NPS 1‐1/2 and 2 consistent with ASME B16.4
Steel and Stainless Steel Valves
Flanged: NPS 1 through 8 CL150, 300, and 600
raised‐face or ring‐type joint flanges per ASME B16.5
Screwed or Socket Welding: NPS 1/2 through 2
consistent with ASME B16.11
Buttwelding: NPS 1 through 8. All available
ASME B16.25 schedules that are consistent with
ASME B16.34
Also see table 2
Maximum Inlet Pressure(1)
Cast Iron Valves
Flanged: Consistent with CL125B or 250B per ASME
B16.1
Screwed: Consistent with CL250 per ASME B16.4
WCC and Stainless Steel Valves
Flanged: Consistent with CL150, 300, and 600(3) per
ASME B16.34
Screwed or Welding: Consistent with flanged CL600
per ASME B16.34
Do not exceed the pressure, temperature, and
pressure drop conditions specified when the valve
was ordered. See the Installation section for
additional information.
Shutoff Classifications per ANSI/FCI 70‐2
and IEC 60534‐4
YD
Standard Design: Class IV
High‐Temperature Design: Class II
YS
Standard Class: Class IV
Optional Class: Class V
Flow Characteristic
Linear
Approximate Shipping Weights
NPS 1/2, 3/4 Valves: 14 kg (30 pounds)
NPS 1 Valves: 18 kg (40 pounds)
NPS 1‐1/2 Valves: 27 kg (60 pounds)
NPS 2 Valves: 39 kg (85 pounds)
NPS 2‐1/2 Valves: 50 kg (110 pounds)
NPS 3 Valves: 68 kg (150 pounds)
NPS 4 Valves: 109 kg (240 pounds)
NPS 6 Valves: 227 kg (500 pounds)
NPS 8 Valves: 447 kg (985 pounds)
1. EN (or other) ratings and end connections can usually be supplied; consult your Emerson sales office or Local Business Partner.
2. The pressure or temperature limits in this manual, and any applicable standard limitations, should not be exceeded.
3. Certain bonnet bolting material selections may require a CL600 easy‐e valve assembly to be derated. Contact your Emerson sales office or Local Business Partner.
Description
The YD and YS valves are three‐way valves for throttling or on‐off (flow switching) service with converging (flow
mixing) or diverging (flow splitting) flow patterns. YS valves, when used in diverging service, are recommended for
on‐off applications only. These valves are generally shipped as part of a control valve assembly, having a diaphragm,
piston, or manual actuator mounted on them. A typical construction is shown in figure 1.
Specifications
Specifications for the YD and YS valves are shown in table 1. Some specifications appear on the actuator nameplate if
the valve is part of a complete control valve assembly.
Educational Services
For information on available courses for Fisher YD and YS valves, as well as a variety of other products, contact:
Emerson Automation Solutions
Educational Services - Registration
Phone: [phone] or 1-800-338-8158
E-mail: [email protected]
emerson.com/fishervalvetraining

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D100425X012
YD and YS Valves
July 2017
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Installation
WARNING
Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
Personal injury or equipment damage caused by sudden release of pressure might result if the valve assembly is installed
where service conditions could exceed the limits given in table 1 or on the appropriate nameplates. To avoid such injury or
damage, provide a relief valve for overpressure protection as required by government or accepted industry codes and good
engineering practices.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
CAUTION
When ordered, the valve configuration and construction materials were selected to meet particular pressure, temperature,
pressure drop, and controlled fluid conditions. Responsibility for the safety of process media and compatibility of valve
materials with process media rests solely with the purchaser and end‐user. Since some body/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 or Local Business Partner.
Before installing the valve, inspect the valve and pipelines for any damage and any foreign material which may cause
product damage.
1. Before installing the valve, inspect it for any shipping damage and for any foreign material in the valve body cavity.
2. Clean out all pipelines to remove pipe scale, chips, welding slag, and other foreign materials.
3. Use accepted piping and welding practices when installing the valve. For flanged valves, use suitable gaskets
between the valve and the pipeline flanges.
4. Do not install the valve in a system where the working pressures exceed those specified in the ASME
pressure/temperature ratings or those specified by Emerson Automation Solutions.
5. If continuous operation is required during maintenance and inspection, install a conventional three‐valve bypass
around the valve so that the valve can be isolated.
6. Orient the valve so that flow will be in the direction indicated by the flow arrows.
Note
The common port for the YD is the bottom port as shown on the flow direction plates (key 17) in figure 10. The common port for
the YS is the left‐hand port as shown on the flow direction plates in figure 9.
CAUTION
Depending on valve body materials used, post weld heat treating may be required. If so, damage to internal elastomeric
and plastic parts, as well as internal metal parts is possible. Threaded connections may also loosen. In general, if post weld

Instruction Manual
D100425X012
YD and YS Valves
July 2017
4
heat treating is to be performed, all trim parts should be removed. Contact your Emerson sales office or Local Business
Partner for additional information.
7. YD or YS control valves can be installed in any position, although the recommended position is with the actuator
vertical above the valve. For NPS 4 and 6 YS valves, size 80 or larger actuators mounted between 45 degrees above
and 45 degrees below horizontal should be supported. If forces other than normal gravitational forces are
experienced, such as vibrational forces, smaller size actuators might also need to be supported when they are not in
a vertical position. For further information, consult your Emerson sales office or Local Business Partner.
Table 2. Valve Body Sizes and End Connections
VALVES SIZE, NPS CAST IRON VALVES STEEL OR STAINLESS STEEL VALVES
1/2, 3/4 ‐ ‐ ‐ NPT screwed or socket weld
1‐ ‐ ‐ NPT screwed; CL150, 300, or 600 raised‐face or ring‐type
joint flanged; buttwelding; or socket weld
1‐1/2, 2 NPT screwed; CL125 flat‐face flanged; or CL250 raised‐face flanged NPT screwed; CL150, 300, or 600 raised‐face or ring‐type
joint flanged; buttwelding; or socket weld
2‐1/2, 3, 4, 6 CL125 flat‐face or CL250 raised‐face flanged CL150, 300, or 600 raised face or ring‐type joint flanged;
or buttwelding
8‐ ‐ ‐ CL150, 300, or 600 raised face, ring-type joint, or
buttwelding
WARNING
Personal injury could result from packing leakage. Valve packing was tightened before shipment; however, the packing
might require some readjustment to meet specific service conditions. Check with your process or safety engineer for any
additional measures that must be taken to protect against process media.
Valves with ENVIRO‐SEAL live‐loaded packing or HIGH‐SEAL live‐loaded packing will not require this initial
re‐adjustment. See the Fisher instruction manuals titled ENVIRO‐SEAL Packing System for Sliding‐Stem Valves or
HIGH‐SEAL Live‐Loaded Packing System (as appropriate) for packing instructions. If you wish to convert your present
packing arrangement to ENVIRO‐SEAL packing, refer to the retrofit kits listed in the parts kit subsection near the end of
this manual.
Maintenance
Valve parts are subject to normal wear and must be inspected and replaced as necessary. Inspection and maintenance
frequency depends on the severity of service conditions. This section includes instructions for trim maintenance,
packing maintenance, and ENVIRO‐SEAL bellows seal bonnet replacement. All maintenance operations may be
performed with the valve in the line.
WARNING
Avoid personal injury or property damage from sudden release of process pressure or uncontrolled movement of parts.
Before performing any maintenance operations:
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.
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.

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YD and YS Valves
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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. Drain the process media from both sides of the valve.
D Vent the power actuator loading pressure and relieve any actuator spring precompression.
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. Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when
loosening the packing box pipe plug.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
CAUTION
Follow instructions carefully to avoid damaging the product surfaces, which could result in damage to the product.
Packing Lubrication
Figure 2. Lubricator and Lubricator/Isolating Valve (Optional)
LUBRICATOR LUBRICATOR/ISOLATING VALVE
10A9421‐A
AJ5428‐D
A0832‐2
Note
ENVIRO‐SEAL and HIGH‐SEAL packing do not require lubrication.
WARNING
To avoid personal injury or property damage resulting from fire or explosion, do not lubricate packing used in oxygen
service or in processes with temperatures over 260_C (500_F).
If a lubricator or lubricator/isolating valve (figure 2) is provided for PTFE/composition or other packings that require
lubrication, it will be installed in place of the pipe plug (key 14, figure 13). Use a good quality silicon‐base lubricant. Do
not lubricate packing used in oxygen service or in processes with temperatures over 260_C (500_F). To operate the
lubricator, simply turn the cap screw clockwise to force the lubricant into the packing box. The lubricator/isolating
valve operates the same way except open the isolating valve before turning the cap screw and then close the isolating
valve after lubrication is completed.

Instruction Manual
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YD and YS Valves
July 2017
6
Packing Maintenance
Note
For valves with ENVIRO‐SEAL packing, see the Fisher instruction manual ENVIRO‐SEAL Packing System for Sliding‐Stem Valves for
packing instructions.
For valves with HIGH‐SEAL packing, see the Fisher instruction manual HIGH‐SEAL Live‐Loaded Packing System for packing
instructions.
Packing Replacement
WARNING
Observe the warning at the start of the Maintenance section.
Table 3. Recommended Torque for Packing Flange Nuts
VALVE STEM
DIAMETER PRESSURE
RATING
GRAPHITE TYPE PACKING PTFE TYPE PACKING
Minimum Torque Maximum Torque Minimum Torque Maximum Torque
mm Inches NSm LbfSin NSm LbfSin NSm LbfSin NSm LbfSin
9.5 3/8
CL125,
150 3 27 5 40 1 13 2 19
CL250,
300 4 36 6 53 2 17 3 26
CL600 6 49 8 73 3 23 4 35
12.7 1/2
CL125,
150 5 44 8 66 2 21 4 31
CL250,
300 7 59 10 88 3 28 5 42
CL600 9 81 14 122 4 39 7 58
19.1 3/4
CL125,
150 11 99 17 149 5 47 8 70
CL250,
300 15 133 23 199 7 64 11 95
CL600 21 182 31 274 10 87 15 131
25.4 1 CL300 26 226 38 339 12 108 18 162
CL600 35 310 53 466 17 149 25 223
31.8 1‐1/4 CL300 36 318 54 477 17 152 26 228
CL600 49 437 74 655 24 209 36 314
The following procedure covers PTFE V‐ring packing. A similar procedure can be followed for PTFE/composition
packing. However, because PTFE/composition packing comes in split rings, it is possible to replace the rings without
removing the actuator from the valve.
Installation of graphite ribbon/filament packing requires special care to avoid trapping air between the rings. Start only
one ring at a time without forcing the top of the packing ring below the bottom of the entrance chamfer of the
packing box. Thus, when a ring is added, the stack should not be pushed into the cavity more than the thickness of the
added ring.
The arrangement of packing box parts is shown in figures 3, 4, 5, 6, and 7. Key numbers used in the following steps are
shown in figures 13 and 14.

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YD and YS Valves
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1. Remove the actuator and bonnet according to steps 1 through 4 of the Disassembly procedure in the Maintenance
section on page 7.
2. With the stem and valve plug assembly removed from the bonnet, remove the packing nuts (key 5), packing flange
(key 3), wiper ring (key 12), and packing follower (key 13) from the bonnet. The old packing can then be pulled out
with a packing hook (take care to avoid scratching the packing box wall) or pushed out using a rod inserted through
the bottom of the bonnet.
3. Clean the packing box and all metal parts.
4. Complete maintenance necessary on other parts and install the bonnet on the valve as indicated in the Assembly
section (starting on page 12).
5. Install the new packing and associated parts in the sequence shown in figures 3, 4, 5, 6, and 7. Be careful not to
damage the packing during installation.
6. Replace the packing flange and packing flange nuts.
For spring‐loaded PTFE V‐ring packing, tighten the packing flange nuts until the shoulder on the packing follower
contacts the bonnet.
For graphite packing, tighten the packing flange nuts to the maximum recommended torque shown in table 3. Then,
loosen the packing flange nuts, and retighten them to the recommended minimum torque shown in table 3.
For other packing types, tighten the packing flange nuts alternately in small equal increments until one of the nuts
reaches the minimum recommended torque shown in table 3. Then, tighten the remaining flange nut until the
packing flange is level and at a 90‐degree angle to the valve stem.
For ENVIRO‐SEAL or HIGH‐SEAL live‐loaded packing, refer to the note at the beginning of the Packing Maintenance
section.
7. Mount the actuator on the bonnet and make up the stem connection according to the procedure given in the
appropriate actuator instruction manual.
Trim Maintenance
WARNING
Observe the warning at the start of the Maintenance section.
CAUTION
To avoid damaging parts, do not grip the bellows shroud or other parts of the stem/bellows assembly. Grip only the flat
areas on the stem where it extends out of the top of the bellows shroud.
Key numbers in the following procedures are shown in figure 10 for standard YD, in figure 11 for high‐temperature YD,
and in figure 9 for YS, except where indicated.
Disassembly
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve, and drain the process
media from both sides of the valve. Remove actuator supply pressure, and use lock‐out procedures to be sure that
the above measures stay in effect while you work on the equipment.

Instruction Manual
D100425X012
YD and YS Valves
July 2017
8
WARNING
See the WARNING at the beginning of the Maintenance section for more information.
2. Disconnect the actuator stem connector and remove the locknut (key 15, figure 13) that holds the actuator to the
valve. (Valves with a 127 mm (5‐inch) yoke boss use cap screws and nuts to secure the actuator on the valve). Then
lift the actuator from the valve.
Figure 3. Fisher PTFE V‐Ring Packing Arrangements
UPPER WIPER
(KEY 12)
PACKING
FOLLOWER (KEY 13)
LANTERN RING
(KEY 8)
PACKING BOX
RING (KEY 11)
MALE ADAPTOR
PACKING RING
FEMALE ADAPTOR
LOWER WIPER
ASSEMBLY 1
(POSITIVE
PRESSURES)
ASSEMBLY 2
(VACUUM) ASSEMBLY 3 (POSITIVE
PRESSURES
& VACUUM)
ASSEMBLY 1
(POSITIVE
PRESSURES)
ASSEMBLY 2
(VACUUM) ASSEMBLY 3 (POSITIVE
PRESSURES
& VACUUM)
ASSEMBLY 1
(POSITIVE
PRESSURES)
ASSEMBLY 2
(VACUUM) ASSEMBLY 3 (POSITIVE
PRESSURES
& VACUUM)
9.5 mm (3/8 INCH) STEM 12.7 mm (1/2 INCH) STEM 19.1, 25.4, OR 31.8 mm
(3/4, 1, OR 1‐1/4 INCH) STEM
DOUBLE ARRANGEMENTS
12A8187-C 12A7814-C 12A7839-A
B1428‐2
UPPER WIPER
(KEY 12)
PACKING
FOLLOWER (KEY 13)
PACKING BOX
RING (KEY 11)
FOR 316 OR 17‐4PH SST
METAL PACKING BOX PARTS
SINGLE ARRANGEMENT
12A7837-A
B1429-2
FOR ALL OTHER METAL PACKING
BOX PART MATERIALS
SPACER (KEY 8)
UPPER WIPER
(KEY 12)
PACKING
FOLLOWER
(KEY 13)
PACKING BOX
RING (KEY 11)
FEMALE
ADAPTOR
FEMALE
ADAPTOR
MALE
ADAPTOR
PACKING
RING MALE
ADAPTOR
PACKING
RING
WASHER
(KEY 10)
SPRING
(KEY 8)
PACKING
SET
(KEY 6)
LOWER
WIPER
LOWER
WIPER

Instruction Manual
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YD and YS Valves
July 2017
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Figure 4. Detail of Fisher PTFE/Composition Packing Arrangements
UPPER WIPER
(KEY 12)
PACKING
FOLLOWER (KEY 13)
LANTERN RING
(KEY 8)
PACKING BOX
RING (KEY 11)
PACKING RING
(KEY 7)
9.5 mm
(3/8 INCH)
STEM
12.7 mm
(1/2 INCH)
STEM
19.1, 25.4, OR 31.8 mm
(3/4, 1, OR 1‐1/4 INCH)
STEM
TYPICAL (DOUBLE) ARRANGEMENTS
12A8188‐A
12A7815‐A
12A8173‐A
A2619‐1
Figure 5. Fisher Graphite Ribbon/Filament Packing Arrangements
PACKING
FOLLOWER
PACKING BOX
RING
1
GRAPHITE
RIBBON
PACKING RING
GRAPHITE
FILAMENT
PACKING RING
14A1780-B
14A1849-B
14A2153-B
12.7 mm
(1/2‐INCH)
STEM
9.5 mm
(3/8‐INCH)
STEM
19.1 OR 25.4 mm
(3/4 OR 1‐INCH)
STEM
1
1
1
1
1
NOTE:
0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS.
USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.
HAS THE APPEARANCE OF A WOVEN OR BRAIDED RING.
A2438‐2
1
2
LANTERN RING
2
PACKING
FOLLOWER
PACKING BOX
RING
GRAPHITE
RIBBON
PACKING RING
GRAPHITE
FILAMENT
PACKING RING
2
1
1
1
13A9776-B
13A9775-B
14A3411-A
12.7 mm
(1/2‐INCH)
STEM
9.5 mm
(3/8‐INCH)
STEM
19.1 OR 25.4 mm
(3/4 OR 1‐INCH)
STEM
SINGLE PACKING ARRANGEMENT DOUBLE PACKING ARRANGEMENT
LANTERN RING

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YD and YS Valves
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Figure 6. PTFE Packing Arrangements for Use in Fisher ENVIRO‐SEAL Bellows Seal Bonnets
UPPER WIPER
(KEY 12)
PACKING SET: (KEY 6)
FEMALE ADAPTOR
PACKING RING
MALE ADAPTOR
BUSHING (KEY 13)
9.5 mm
(3/8 INCH)
STEM
12.7 mm
(1/2 INCH)
STEM
DOUBLE ARRANGEMENTS
9.5 mm
(3/8 INCH)
STEM
9.5 mm
(3/8 INCH)
STEM
12.7 mm
(1/2 INCH)
STEM FOR
NPS 2 VALVES
12.7 mm
(1/2 INCH)
STEM FOR
NPS 3 AND 4 VALVES
THRUST
RING
(KEY 39)
SPRING
(KEY 8)
THRUST
RING
(KEY 39)
THRUST
RING
(KEY 39)
BUSHING
(KEY 13)
BUSHING
(KEY 13)
SPACER
(KEY 8)
SPACER
(KEY 8)
SPACER
(KEY 8)
12.7 mm
(1/2 INCH)
STEM
SINGLE ARRANGEMENTS
FOR S31600 (316 SST)
PACKING BOX PARTS
FOR ALL PACKING BOX
MATERIALS EXCEPT S31600
UPPER WIPER
(KEY 12)
PACKING SET: (KEY 6)
FEMALE ADAPTOR
PACKING RING
MALE ADAPTOR
BUSHING (KEY 13)
SPACER
(KEY 8)
A5863
12B4183-A 18A0906-D 18A5338-A
12B4182-A SHT 1 12B4185-A SHT 1 12B4182-A SHT 2 12B4185-A SHT 2
3. Remove the nuts (key 16, figures 9 and 10) or cap screws from the bonnet flange.
4. Lift off the bonnet along with the valve plug and stem (keys 2 and 5, figures 9 and 10). Due to the design of the
valve, several other trim parts will be drawn out with the valve plug. They are as follows:
YD (Standard)‐‐The upper cage (key 3A) and associated seals, gaskets, and shim (keys 9, 11, 19, 20A, 20B, and 22).
YD (High Temperature)‐‐The upper cage (key 3B) and associated gaskets and shim (keys 9, 11, and 22).
YS‐‐The upper seat (key 7), upper cage (key 3), and associated gaskets and shim (keys 9, 11, and 22).
CAUTION
The exposed portion of the cage provides a guiding surface that must not be damaged during disassembly or maintenance.
Damage could affect valve performance. If the cage is stuck in the valve, use a rubber mallet to strike the exposed portion
at several points around the circumference.