Fisher® EHD and EHT NPS 8 through 14 Sliding-Stem Control Valves0 pages

Instruction Manual

EH Valves NPS 8 through 14

D100392X012

July 2014

Fisherr EHD and EHT NPS 8 through 14
Sliding-Stem Control Valves
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Educational Services . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . 5
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Packing Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Packing Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 7
Replacing Packing . . . . . . . . . . . . . . . . . . . . . . . . 7
Trim Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
EHD, EHT Valve Plug Maintenance . . . . . . . . . . . . . 12
Lapping Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Trim Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Retrofit: Installing Bore Seal Trim . . . . . . . . . . . . . . 17
Replacement of Installed Bore Seal Trim . . . . . . . . 19
Trim Removal (Bore Seal Constructions) . . . . 19
Lapping Metal Seats
(Bore Seal Constructions) . . . . . . . . . . . . . . 20
Remachining Metal Seats
(Bore Seal Constructions) . . . . . . . . . . . . . . 20
Trim Replacement
(Bore Seal Constructions) . . . . . . . . . . . . . . 20
Actuator Mounting . . . . . . . . . . . . . . . . . . . . . . . . . 22
Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Parts Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Bonnet Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Valve Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 1. Fisher EH Series Control Valve
with 667 Actuator

W2992-1

Introduction
Scope of Manual
This instruction manual includes installation, maintenance, and parts ordering information for NPS 8 through 14 Fisher
EHD and EHT sliding-stem globe-style control valves. Refer to separate manuals for instructions covering the actuator,
positioner, and accessories.
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.

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