Flowserve V-377 R4 Edward Valves - Manual (Page 46)

46
Flow Control Division
Edward Valves
8. Retighten the bonnet retainer cap
screws in accordance with the torque
values shown on page 10. All screws
must be tightened uniformly in a star
pattern to avoid cocking the bonnet.
The stem can now be lowered to the
closed position.
9. Retrace disassembly steps 9, 7, 6, 5,
4, 3, and 2 on page 34.
10. Reassemble the operator to the
valve using a procedure opposite the
disassembly.
Type III Pressure-Seal Bonnets –
Stop and Stop-Check (Non-Return)
Valves
See Illustration No. 24 on page 34.
1. Insert the disk, disk-nut, stem assem-
bly, or the disk-piston and stem, low-
ering carefully until they rest on the
valve seat. Hold the stem centrally in
the valve bore.
2. Install a new pressure-seal gasket and
spacer ring on the bonnet. Lower this
assembly carefully into the body until
it rests on top of the stem backseat or
disk-piston.
3. Insert the gasket retainer segments in
the body groove.
4. Lower the bonnet retainer over the
stem.
5. Lift the stem, pulling the bonnet and
pressure-seal gasket spacer ring
assembly into contact with the gasket
retainer segments. Assemble the bon-
net retainer nuts on the bonnet studs.
6. Tighten the bonnet retainer nuts in
accordance with the torque values
shown on page 10. All nuts must be
tightened uniformly in a star pattern
to avoid cocking the bonnet. The
stem can now be lowered to the
closed position.
7. Retrace disassembly steps 9, 7, 6, 5,
4, 3, and 2 on page 36.
8. Reassemble the operator to the
valve using a procedure opposite the
disassembly.
Type III Pressure-Seal Bonnets –
Piston-Lift Check Valve
See Illustration No. 25 on page 35.
1. Insert the piston into the body, lower-
ing carefully until it rests on the valve
seat.
2. Install a new pressure-seal gasket and
spacer ring on the cover and lower
the assembly carefully into the body
until it rests on top of the piston.
3. Insert the gasket retainer segments
into the body groove.
4. Install the cover retainer.
5. Lift the cover, pressure-seal gasket,
and spacer ring assembly into con-
tact with the gasket retainer seg-
ments. Install the cover stud nuts.
6. Tighten the cover stud nuts in accor-
dance with the torque values shown
on page 10. All nuts should be tight-
ened uniformly in a star pattern to
avoid cocking the cover.
7. Replace the cover/cover retainer.
Type III Pressure-Seal Bonnets –
Tilting Disk Check Valves
See Illustration No. 26 on page 38.
1. Insert the disk through the cover end
of the body and hold it against the
valve seat.
2. Checking the tags or parts, place the
proper torsion spring in each hinge
pin so the tang end enters the small
hole in the bottom of the hinge pins.
3. Observing the relative position of the
parts as marked (disassembly step
16d on page 39), insert the hinge
pin and torsion spring through the
body and into the disk. The other
extended tang of the spring must slip
into the hole at the base of the hinge
pin bearing hole in the disk.
4. Install a new pressure-seal gasket on
the hinge pin.
5. Position the hinge pin retainer so the
roll pin enters the hole in the hinge
pin and the projecting diameter is
against the pressure-seal gasket. The
hinge pin retainer must be rotated
about 20° in the direction of spring
wind to line up with the holes for the
cap screws.
6. Tighten the retainer cap screws in
10 ft.-lbs. increments to the torque
value shown on page 10.
7. Install a new pressure-seal bonnet
gasket and spacer ring on the cover
and lower the assembly carefully into
the body until it rests on top of the
disk.
Reassembly Procedures for Metal Pressure-Seal Valves
(continued)