Flowserve H71 Series - Manual (Page 3)

Flow Control Division
Worcester Control Valves
with the media being handled. White petroleum jelly is a good
general purpose lubricant.
h. For stem area rebuilding, refer to the illustrations on the
following page.
Order of Assembly:
Place new thrust bearing(s) on stem and insert assembly through
body cavity. Place new stem seals, stem seal protector and the
follower in position. Peek thrust bearing and stem seal protectors are
placed outside of seals and bearings. The seals/bearings must contact
the body.
Stem seals, stem seal protectors and thrust bearings that are the
same size and color are interchangeable.
i. For 1/2"–1 1/2" manual valves, place two new Belleville
washers in position with the larger diameter sides touching
each other. For automated valves with single self-locking stem
nut, place four new Belleville washers in position (two pairs of
washers with larger diameter sides touching each other).
j. For 1/2"–1 1/2" valves, place retaining or self-locking stem nut
on stem and using handle or a wrench to prevent rotation,
tighten nut to make snug and firm. Follow Section C -
Maintenance - for proper stem adjustment.
k. For 1/2"–1" manual valves, replace one-piece handle and stop,
and for 1 1/2" manual valves replace one-piece wrench/stop
and extension, lockwasher and handle nut on stem. (This step
is not applicable to valves with self-locking stem nut).
l. For 2" valves, replace stop (manual valves only) or stem
spacer (automated valves only) and retaining nut. Follow
Section C- Maintenance-for proper stem adjustment. For 2"
manual valves, replace wrench block and extension and
secure with hex head screw.
m. With valve in closed position (stem flats going across
pipeline), replace ball and seats. With valve in open position,
carefully insert new body seals and place center section
between pipe ends.
NOTE: Smaller body seals included in repair kit are for earlier version
valves with smaller seal grooves only.
NOTE: Valves with a pressure relief hole in the ball (V3) must be
assembled and installed with the hole upstream, when the valve is
closed to insure that cavity relief is upstream. Any valve with a relief
hole will have an arrow on the body pointing downstream. This arrow
is stamped on the body or on a metal tag welded to the body.
Replace and tighten body bolts and nuts per torque figures
and method found in Section A.2.e. Cycle valve three times to
break in the seats after the rebuild.
CAUTION: Do not scratch body seals when replacing valve
body.
When ordering parts, please provide the part name and the following
information as found on the valve nameplate or mounting bracket
nameplate: The terminology shown in the exploded view Parts Listing
on next page is standard.
1. Valve Size, Style and Revision Number.
Example: 1/2" H7166 XM SW RO Stem
2. Size, Style and Five-Character Code (known as a “P”, “T”, “C”, or
similar number), the designation for a non-standard product.
Example: 3/4" H7146 XV SW C0222 Ball
14932-D 3