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Fisher
™
YD and YS 3‐Way Valves
Contents
Introduction
1
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Scope of Manual
1
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Specifications
2
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Educational Services
2
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Installation
3
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Maintenance
4
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Packing Lubrication
5
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Packing Maintenance
6
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Packing Replacement
6
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Trim Maintenance
7
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Disassembly
7
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Assembly
12
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ENVIRO‐SEAL
t
Bellows Seal Bonnet
16
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Replacing a Plain or Extension Bonnet with an
ENVIRO‐SEAL Bellows Seal Bonnet
(Stem/Bellows Assembly)
16
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Replacement of an Installed
ENVIRO‐SEAL Bellows Seal Bonnet
(Stem/Bellows Assembly)
18
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Purging the ENVIRO‐SEAL
Bellows Seal Bonnet
19
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Parts Ordering
24
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Parts Kits
24
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Gasket Kits
25
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Parts List
26
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YD and YS Valve
26
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Bonnet for YD and YS
26
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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
