Flowserve V-378 R1 Edward Equiwedge Gate Valve - Manual (Page 25)

25
Flow Control Division
Edward Valves
1/8” (3mm) and align the gland
bolts with the yoke windows.
10. Tighten the bonnet retainer cap
screws using a torque wrench in a
star pattern to the values shown on
Table 2, pg. 7. See step 13 below.
11. Repack the packing chamber fol-
lowing instructions on pg. 6. Place
the gland in position and tighten
the gland nuts.
12. Reassemble the handwheel,(or
actuator) using the reverse of the
instructions for disassembly.
13. After the valve is pressurized,
retighten the bonnet retainer cap
screws using the same torque val-
ues in step 10. This is important.
Types IIA & IIB Pressure Seal Bonnet
See Illustration Nos. 8 & 9. pg. 15
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. If
necessary, clamp the gate halves
together on top of the guide rails
using “Kant Twist” type clamps.
Install an eye bolt into the top of
the stem. Stems 1.62” (41.1mm)
and larger in diameter are drilled
and tapped on the top end. See
illustration 17, for clamping
arrangement.
3. Carefully lift the stem-gate assem-
bly using a hoist if necessary to
avoid scratching the stem or gate
surfaces, and lower the assembly
part way into the body with the
guide rails fully engaged with the
guide grooves. Remove the clamps
and lower the assembly until the
gate contacts the seats.
4. Assemble a new pressure seal gas-
ket and the junk ring onto the bon-
net. Lift the bonnet over the stem,
using a hoist if necessary, and
lower it into the body. Be very
careful not to mar the pressure seal
gasket or other machined surfaces.
5. Place the bonnet retainer plate on
the body if it is a separate part,
and align the cap screw holes with
the body.Omit this step if the bon-
net retainer is integral with the
yoke.
6. Place the gland over the stem.
7. Place the yoke over the stem and
engage the stem threads with the
yoke bushing by turning the yoke
bushing counterclockwise. When
the yoke contacts the bonnet retain-
er plate or body, align the cap
screw holes and continue to turn
the yoke bushing until the stem
contacts the backseat. This will pull
the bonnet and gasket up against
the gasket retainer and the yoke
flange up against the body. While
this is being accomplished, the
studs in the body and bonnet must
be aligned with the holes in the
yoke(or bonnet retainer plate).
8. Assemble the yoke cap screws or
nuts and tighten in a star pattern
using a torque wrench to the val-
ues shown on Table 2, pg. 7.
9. Assemble the nuts on the bonnet
studs and tighten in a star pattern
using a torque wrench to the val-
ues shown on Table 2, pg. 7. See
step 12 below.
10. Repack the packing chamber fol-
lowing the instructions on pg. 6.
Place the gland in position over the
studs and tighten the gland nuts.
Reassembly Instructions for Valves with Metal Gaskets Only
(cont.)
Clamping For Securing Gate Halves
During Assembly/Disassembly
Illustration No. 17
AJAX
“KANT TWIST” CLAMPS