Instruction Manual
D101642X012
ENVIRO-SEAL Sliding-Stem Valves
Fisher™ ENVIRO-SEAL™ Packing System for
Sliding-Stem Valves
July 2017
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 2.................................
Installation 3..................................
Tightening Procedures 7.......................
Other Considerations 7..........................
Parts Ordering 7................................
Retrofit Kits 8..................................
easy-e™, A, EH, HP, YD, YS Retrofit Kits 8..........
Repair Kits 8...................................
easy-e, A, EH, HP, YD, YS Repair Kits 8............
Introduction
Figure 1. Fisher easy-e Valve Bonnet with
ENVIRO-SEAL Packing
PACKING
FLANGE
PACKING
FOLLOWER
VALVE
BONNET
W5814-1*
VALVE
STEM
BELLEVILLE
SPRINGS
Scope of Manual
This instruction manual includes installation and parts information for Fisher ENVIRO-SEAL live-loaded packing systems
(see figure 1). These systems are available for Fisher sliding-stem valves with 9.5, 12.7, 19.1, 25.4, 31.8, and 50.8 mm
(3/8, 1/2, 3/4, 1, 1-1/4, and 2 inch) diameter stems. The system can be used with many sliding-stem valves as shown in
the Applications section of the Specifications. Refer to appropriate valve and actuator instruction manuals for
necessary information relating to the disassembly and assembly of the valve and actuator. ENVIRO-SEAL packing
systems for sliding-stem valves utilize a Belleville (coned-disk) spring system in the pressure/temperature ranges
shown in the specifications. For higher pressure/temperature ratings, refer to the HIGH-SEAL ULF Live-Loaded Packing
System instruction manual, D101453X012
Do not install, operate, or maintain ENVIRO-SEAL live-loaded packing systems 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
Business Partner before proceeding.
www.Fisher.com
.
or Local
ENVIRO-SEAL Sliding-Stem Valves
July 2017
Table 1. Specifications
Instruction Manual
D101642X012
Applicable Product Types and Stem Diameters
See tables 2 and 3
TÜV Certification
TÜV has certified the stem sealing capabilities of
ENVIRO-SEAL PTFE and Graphite ULF packing systems
for sliding-stem valves with TA Luft emission control
requirements. See figures 8 and 9 for copies of these
Pressures and Temperatures
See figure 2. Figure 2 applies only to ENVIRO-SEAL
packing for 100 ppm service. Pressure and
temperature ratings for non-environmental service
are in the packing bulletins. See the appropriate valve
instruction manual for additional pressure and
temperature ratings.
certificates
1. For availability of ENVIRO-SEAL packing system with a specific valve, please contact your Emerson sales office or Local Business Partner.
2. The pressure/temperature limits in this manual, in the valve literature, and any applicable code or standard limitation, should not be exceeded.
Figure 2. Applications Guidelines for 100 ppm Service
ENVIRO-SEAL GRAPHITE ULF AND
HIGH-SEAL GRAPHITE ULF
ENVIRO-SEAL DUPLEX
ENVIRO-SEAL PTFE
(2)
A6142-1
NOTE:
FOR MAXIMUM CYCLE LIFE, GRAPHITE ULF PACKING SHOULD BE USED IN SERVICES WHERE THE VAST MAJORITY OF THE VALVE CYCLES OCCUR AT TEMPERATURES
OF 150_C (300_F) OR GREATER.
Description
ENVIRO-SEAL packing systems, with exceptional sealing capabilities, can be easily installed into your existing valves or
can be purchased with new valves. These systems help seal your process to conserve valuable fluids, and protect the
environment against the emission of hazardous or polluting liquids and gases. The external live-loading provides a
constant load over the life of the packing material, which reduces your need for packing box adjustment and
maintenance.
If the piping and valve are insulated, do not allow insulation to extend above the yoke boss surface, covering the
ENVIRO-SEAL packing arrangement. Keep the ENVIRO-SEAL packing arrangement exposed to ambient air conditions.
2
Instruction Manual
D101642X012
ENVIRO-SEAL Sliding-Stem Valves
July 2017
Installation
ENVIRO-SEAL packing systems are designed for quality performance over extended periods. This longevity allows for
packing maintenance to be performed as it should be, at regularly scheduled plant outages or turn-arounds.
Use these instructions to install ENVIRO-SEAL packing in valves that have standard packing or when inspecting or
replacing ENVIRO-SEAL packing.
If you are changing the packing system material to a different material, such as PTFE to Graphite ULF, it is good
practice to review actuator sizing, as packing friction will change. See tables 4, 5, and 6 for information on packing
friction.
WARNING
Avoid personal injury 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.
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 other hazards that may be present from exposure to process media.
Figure 3. ENVIRO-SEAL Packing Assembly Procedure
ALTERNATE FROM ONE HEX NUT TO
THE OTHER AS YOU TIGHTEN
HEX NUT
THESE TWO SURFACES MUST REMAIN PARALLEL
AS YOU TIGHTEN THE HEX NUTS
PACKING
FLANGE
STUD
BONNET
A6143
3
ENVIRO-SEAL Sliding-Stem Valves
July 2017
Instruction Manual
D101642X012
Table 2. Fisher Sliding-Stem Product Availability for ENVIRO-SEAL Duplex Packing
VALVE
(1)
A X X - - - X X X - - -
DBQ - - - X - - - X X X - - -
easy-e (ED, ES,
ET, EW, EZ)
EH - - - X - - - X X X X
FB - - - - - - - - - - - - X X X
HP - - - X - - - X X X - - HS - - - X - - - X X - - - - - -
SS-83 - - - - - - - - - X X X - - -
YD X X - - - X X X - - -
YS X X - - - X X X - - -
1. Contact your Emerson sales office for valves not listed.
9.5
(3/8)
X X - - - X X X - - -
12.7
(1/2)
STEM DIAMETER, mm (INCHES)
15.9
(5/8)
19.1
(3/4)
25.4
(1)
31.8
(1-1/4)
Table 3. Fisher Sliding-Stem Product Availability for ENVIRO-SEAL PTFE and Graphite ULF Packing Systems
VALVE
(1)
A X X - - - X X X - - - - - - - - -
CAV4 - - - - - - - - - X X X X - - - - - -
D - - - X - - - - - - - - - - - - - - - - - - - - -
DA - - - X - - - - - - - - - - - - - - - - - - - - -
DBQ - - - X - - - X X X - - - - - - - - -
DBQ-NS - - - X - - - - - - - - - - - - - - - - - - - - -
easy-e (ED,
ES, ET, EW,
EZ)
E-NS - - - X - - - - - - - - - - - - - - - - - - - - -
EH - - - X - - - X X X X - - - - - -
ENA - - - - - - - - - - - - - - - X X - - - - - -
ET-C - - - X - - - X X - - - - - - - - - - - -
EWT-C - - - X - - - X X - - - - - - - - - - - -
EZ-C X X - - - X - - - - - - - - - - - - - - -
FB - - - - - - - - - - - - X X X - - - - - HP - - - X - - - X X X - - - - - - - - HS - - - X - - - X X - - - - - - - - - - - -
SS-79 - - - - - - - - - X - - - - - - - - - - - - - - SS-83 - - - - - - - - - X X X X - - - - - SS-85 - - - X - - - - - - - - - - - - - - - - - - - - SS-95 - - - X - - - - - - - - - - - - - - - - - - - - SS-98 - - - - - - - - - - - - X - - - - - - - - - - - -
YD X X - - - X X X - - - - - - - - -
YS X X - - - X X X - - - - - - - - -
1. Contact your Emerson sales office for valves not listed.
9.5
(3/8)
X X - - - X X X - - - - - - - - -
12.7
(1/2)
STEM DIAMETER, mm (INCHES)
15.9
(5/8)
19.1
(3/4)
25.4
(1)
31.8
(1-1/4)
50.8
(2)
STEM DIAMETER,
mm
12 mm 16 mm
50.8
(2)
If you are installing the system in a valve that is still connected to an actuator, remove the actuator from the valve to
provide sufficient space to install the packing assembly. If a spring-return actuator is used, it is possible that
disconnecting the stem connector will allow the spring to force the actuator to the end of its travel. Be sure the
actuator spring is resting on its travel stop. Refer to the appropriate valve and actuator instruction manuals to remove
the actuator.
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