Flowserve V-377 R4 Edward Valves - Manual (Page 19)

19
Flow Control Division
Edward Valves
For Method 1, first remove the operator-
yoke assembly combination as described
in “Procedure for Removing Valve Opera-
tor and Yoke Assembly as a Unit” on page
29. Then proceed to the section “Disassem-
bly Procedure of Bonnet Types” on page
31, omitting any steps preceded by an
asterisk (*) for the actual disassembly of
Area 3. On all revolving stem and Type IV
bonnets, only method 2, as follows, should
be used.
For Method 2, first remove the operator by
following the applicable section, “Disas-
sembly Procedure for Impactor Handwheels
and Handles” on page 19, or “Disassem-
bly Procedure for Removing Operators
from Valve Yokes” on page 22. Then, pro-
ceed to the section “Disassembly Procedure
of Bonnet Types” on page 31, for actual
disassembly of Area 3. On Type IV bon-
nets, reverse this procedure and complete
steps 1 through 9 on pages 39 & 40,
before beginning operator disassembly.
If failures are indicated in any combination
of Areas 1, 2, or 3, then each of the
respective procedures must be followed.
For check valves without stems or opera-
tors, simply use the proper section under
“Disassembly Procedure of Bonnet Types”
on page 31. Disassembly Procedures
for Impactogear Handles
and Handwheels
(With or Without Impactogear
Air Wrench Operators)
AREA 1
Edward pressure-seal valves use several
designs of Impactor handles or hand-
wheels, depending upon the valve size
and pressure class.
Handwheels can be removed while the
valve is pressurized, but caution must be
observed to make certain that it’s first in
the back-seated or fully opened position.
See “Caution”
on page 18.
Valves equipped with Impactogear air
wrench operators do not require disassem-
bly of the Impactogear itself. However, dur-
ing regular impactor handwheel disassem-
bly, the Impactogear pinion gear and the
handwheel gear will be separated.
All of the following handwheel disassembly
procedures are arranged in accordance
with the general comments on page 18.
Study these pages carefully before begin-
ning disassembly.
To disassemble, first determine the type of
handwheel on the valve by measuring its
diameter or referring to the valve dimen-
sion drawing. Then select the proper
procedure, as listed below.
Disassembly Procedures for Pressure-Seal Valves
(continued)