Flowserve V-378 R1 Edward Equiwedge Gate Valve - Manual (Page 26)

26
Flow Control Division
Edward Valves
11. Reassemble the handwheel, (or
actuator) using the reverse of the
instructions for disassembly.
12. After the valve is pressurized,
retighten the bonnet retainer nuts
using same torque values as in
Step 9. This is important.
Type III Pressure Seal Bonnet
See Illustration No. 10, pg. 16
1. Place one gate half on a clean ply-
wood board. Place the stem T-head
into the recess in the gate.
2. Place the gate spacer ring into the
counterbore in one gate half. Place
the other gate half on top, engag-
ing the spacer ring and stem.
Holding the gate halves together,
lift the stem and lower the assem-
bly into the body engaging the
gate guide rails with the groove in
the body. Lower the gate to the
seats.
3. Assemble a new pressure seal gas-
ket, the spacer ring and junk ring
on the bonnet. Lift the bonnet
assembly over the stem and lower
into the body. Be very careful not
to mar the pressure seal gasket or
other machined surfaces.
4. Assemble the gasket retainer seg-
ments into the groove.
5. Place the thrust washer on the
body, and the bonnet retainer
plate on top of the body. Lift the
stem assembly up so that the bon-
net penetrates the gasket retainer
segments and engages the threads
of the bonnet retainer and bonnet.
The bonnet retainer cap screw
should be engaged so they are
flush. Lift the stem assembly up and
screw the bonnet retainer down
until it contacts the body. Now
back it off about 1/8” (3mm) and
align the gland bolts for correct ori-
entation.
6. Place the gland over the stem.
7. Place the yoke over the stem and
engage the stem threads by turning
the yoke bushing counterclockwise.
When the yoke contacts the body,
align the cap screw holes and con-
tinue to turn the yoke bushing until
the stem contacts the backseat firm-
ly. This will pull the bonnet, gasket,
and spacer ring up against the
bonnet retainer and the yoke up
against the body.
8. Assemble the yoke flange cap
screws and tighten the cap screws
using a torque wrench to the val-
ues shown on Table 2, pg. 7. See
step 12 below.
9. Tighten the bonnet retainer cap
screws in a star pattern using a
torque wrench to the values shown
on Table 2, pg. 7.
10. Repack the packing chamber, fol-
lowing the instructions on pg. 6.
Place the gland in position and
tighten the gland nuts.
11. Reassemble the handwheel, (or
actuator) using the reverse of the
instructions for disassembly.
12. After the valve is pressurized,
retighten the bonnet retainer cap
screws, step 8, using the same
torque values. This is important.
Type IV & V Pressure Seal Bonnet
See Illustration Nos. 11 & 12, pg. 17
1. Place one gate half seat face down
on a bed of clean rags or plywood
board. Place the stem T-head into
the recess in the gate.
2. Place the gate spacer ring into the
counterbore in one gate half. Place
the other gate half on top, engag-
ing the spacer ring and stem.
Clamp the gate halves together
near the top of the guide rails.
Place an eyebolt in the top end of
the stem. Stems 1.62” (41.1mm)
and larger are drilled and tapped
on the top end. See illustration No.
17, pg. 25, for clamping arrange-
ment.
3. Carefully lift the stem-gate assem-
bly, using a hoist in the eyebolt if
necessary, so as to avoid scratch-
ing the stem or gate surfaces.
Lower the assembly part way into
the body with the gate guide rails
engaged with the body guide
groove. Remove the clamps and
lower the assembly until the gate
contacts the seats.
Reassembly Instructions for Valves with Metal Gaskets Only
(cont.)