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Fisher
r
EHD and EHT NPS 8 through 14
Sliding-Stem Control Valves
Contents
Introduction
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope of Manual
1
. . . . . . . . . . . . . . . . . . . . . . . . . .
Description
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Principle of Operation
4
. . . . . . . . . . . . . . . . . . . . . . .
Maintenance
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Packing Lubrication
5
. . . . . . . . . . . . . . . . . . . . . . .
Packing Maintenance
6
. . . . . . . . . . . . . . . . . . . . . .
Replacing Packing
6
. . . . . . . . . . . . . . . . . . . . . . .
Trim Removal
10
. . . . . . . . . . . . . . . . . . . . . . . . . . .
EHD, EHT Valve Plug Maintenance
10
. . . . . . . .
Lapping Seats
11
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Trim Replacement
11
. . . . . . . . . . . . . . . . . . . . . . .
Retrofit: Installing Bore Seal Trim
13
. . . . . . . . . . .
Replacement of Installed Bore Seal Trim
15
. . . .
Trim Removal (Bore Seal Constructions)
15
. . .
Lapping Metal Seats
(Bore Seal Constructions)
16
. . . . . . . . . . . . .
Remachining Metal Seats
(Bore Seal Constructions)
16
. . . . . . . . . . . . .
Trim Replacement
(Bore Seal Constructions)
17
. . . . . . . . . . . . .
Actuator Mounting
18
. . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering
18
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Kits
19
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List
21
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bonnet Assembly
21
. . . . . . . . . . . . . . . . . . . . . . . .
Valve Assembly
23
. . . . . . . . . . . . . . . . . . . . . . . . .
Introduction
Scope of Manual
This instruction manual includes installation,
maintenance, and parts ordering information for
NPS 8 through 14 Fisher
r
EHD and EHT
sliding-stem globe-style control valves. Refer to
separate manuals for instructions covering the
actuator, positioner, and accessories.
Figure 1. Fisher
r
EH Series Control Valve
with 667 Actuator
W2992-1/IL
Do not install, operate, or maintain an EH valve
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 Process Management sales office before
proceeding.
Instruction Manual
D100392X012
April 2009
EH Valves (NPS 8 through 14)
