Flowserve V-378 R1 Edward Equiwedge Gate Valve - Manual (Page 16)

16
Flow Control Division
Edward Valves
See illustration No. 10.
1. With the valve in a partially open
position, loosen the gland nuts and
tap the gland to loosen engagement
of the gland barrel with the packing
chamber. This should relieve any
pressure that may be trapped in the
valve.
2. Loosen and remove the hex socket
head cap screws fastening the yoke
to the body. Close the valve and
raise the yoke assembly off the body.
Continue to close the valve until the
stem threads are disengaged from
the yoke bushing. Lift the yoke assem-
bly over the stem and set it on a
clean plywood board or a bed of
rags.
3. Remove the gland nuts and gland
and set the parts aside.
4. Loosen the hex socket head cap
screws on the bonnet retainer.
Unscrew the bonnet retainer from the
bonnet and set aside.
5. Using a brass rod and hammer, drive
the bonnet down into the body far
enough to expose the gasket retainer
segmented rings. Now drive the gas-
ket retainer down to gain clearance
for removal. The gasket retainer ring
is split in three or four pieces; the
shortest must be removed from the
groove first, then the other two or
three.
6. Place the bonnet retainer on top of
the body and lift the stem-bonnet
assembly up through the gasket and
spacer ring. Screw the bonnet retain-
er onto the bonnet until it is snug
against the body. Tighten the bonnet
retainer hex socket head cap screws
in a star pattern against the body to
jack out the gasket. Be careful not to
cock the bonnet. This step may have
to be repeated by loosening the hex
socket head cap screws and by
screwing the bonnet retainer down
on the bonnet threads to a new posi-
tion and then tightening the cap
screws against the body until the gas-
ket breaks free. See the note below. 7. The stem, bonnet, and gate assembly
can now be removed but be careful
to either clamp the gate halves
together or hold them securely while
withdrawing parts (see illustration
No. 17, pg. 25). This is necessary
because when the gate halves are
disengaged from the guide grooves
in the body, they can fall off the stem.
Place the assembly on a bed of rags.
Note: These instructions have been
sequenced for a valve in a horizontal
pipeline with the stem in the vertical, up
position. With a different stem orienta-
tion the steps will have to be slightly
modified. For example, in step 6, if the
valve were in a horizontal pipeline with
the stem down when the gasket comes
free, all parts would fall; some provision
must be made to support the stem-bon-
net assembly when the gasket breaks
loose.
Disassembly Procedure of Bonnet Types Area 3
(cont.)
Type III,
Sizes 2-1/2"- 3",
Classes 900,
1500, 2500
Figure Numbers
1911, 1911Y,
11511, 11511Y,
12511, 12511Y,
12011Y, 14311Y
or 14411Y
Illustration No. 10
Valve Type III