Flowserve V-378 R1 Edward Equiwedge Gate Valve - Manual (Page 20)

Flow Control Division
Edward Valves
Reassembly Instructions
The yoke bushing threads should be
cleaned in the same manner as the other
threaded parts and regreased. The same
lubricant should be used to regrease the
yoke bushing bearings through the lube
fitting. See pg. 8 for lubricant recommen-
dations. Follow these guidelines:
1. Replace the stem packing.
2. Replace the pressure seal gasket with a
new gasket.
3. Observe all match marks assigned dur-
ing disassembly so that part orientation
is maintained.
4. Reassemble stud nuts and cap screws
using a torque wrench. See Table 2, pg.
7, for recommended torque values.
5. When reassembling the bearings in the
yoke assembly, use the following proce-
dure to obtain the proper clearance or
preload.
Handwheel Actuated Valves
1. Equiwedge gate valves with stems
1-7/8” (47.6mm) diameter and smaller
are equipped with needle bearings. See
illustration No. 14. One bearing set is
placed below the yoke bushing collar
and one set above. All parts are
retained by a screwed-in bearing retain-
er. This bearing retainer has spanner
wrench holes on the top face for adjust-
ment and is locked in place with a
nylock set screw on the side of the yoke
near the top.
2. The needle bearings should not have a
preload. Rather, a slight amount of
clearance is recommended. Tighten
down the bearing retainer using a span-
ner wrench until the bearing retainer is
snug, then back it off 15 to 20 degrees.
This is equal to 0.004” to 0.005”
(.10mm to .13mm) clearance.
3. Tighten the set screw and relube through
the lube fitting.
4. On valves with stem diameters 2”
(50.8mm) and greater, the yoke assem-
bly is equipped with tapered roller bear-
ings. One bearing set is placed below
the yoke bushing collar and one set is
placed above this collar. All parts are
retained by a bolted-on bearing
retainer.
5. Tapered roller bearings do require a
preload, See illustration No.15.
Preloading is accomplished by using a
shim kit. If the bearings are not to be
replaced, use all the shims that were in
the original assembly. If the bearings
are to be replaced, a new shim kit
should be used.
Yoke Assembly With Needle Bearings
Illustration No. 14
Yoke Assembly With Taper Roller Bearings
Illustration No. 15 20