Flowserve 82 Series Flanged One-Piece - Manual (Page 3)

18510-P 3
which may be on the stem or in the body stem cavity.
Remove and discard the far seat. Retain the follower.
To Disassemble 2"-10" Two-Piece Valves:
f. Valve should be placed with the end connector (smaller body
section) uppermost and on a clean surface, the valve
preferably clamped or bolted down. To disassemble end
connector from body, remove body stud nuts from mid-
flange.
g. Strike end connector with mallet and close the valve. The
mid-flange connection should break open. Repeat if not
successful at first try. The end connector should now be lifted
vertically from the body and placed on the clean surface with
mid-flange end uppermost.
With the valve still in the closed position the ball may now be
lifted from the body cavity, and the seats and body seal are
now exposed in either body or end connector. These should
now be removed. Care must be taken to avoid scratching the
machined faces on which they make contact with valve body
and end connector.
General Note: Depending on whether a standard or AF Series
valve is being disassembled, stem seals may be three-piece
or one-piece. Also, the 2
1 /
2
"-10" 82/83 Series valves have one
metal stem washer, and the 2 1 /
2
"-10" AF82/83 Series valves
have two metal stem washers under the stem seal(s).
i. Remove handle assembly (if any) by loosening handle screw.
j. Remove retaining nut. Prevent stem from rotating by holding
stem with wrench.
k. Remove stop or valve stem spacer (2"-6" actuated valves).
Remove and discard Belleville washer(s) (if present). Remove
and retain the follower.
l. Push stem into body cavity and remove. Remove and discard
stem seal(s) and thrust bearing. Remove and retain stem
washer(s) (if any).
4. Visual Inspection:
a. The ball and the surfaces against which the seats are installed
should be undamaged, clean and free of pit marks and
scratches. Light marring from the action of the ball against
the seats is normal and will not affect the operation of the
valve. Flaws which can be seen but barely detected with
fingertips are acceptable.
b. The stem and body surfaces that the thrust bearing(s) and
stem seal(s) contact, must be undamaged, clean and free of
pit marks and scratches.
5. Reassembly:
Refer to exploded views and also stem build illustrations on the
following pages for proper reassembly.
NOTE: Care must be used when handling graphite stem seals, thrust
bearings, and body seals. These parts can be easily damaged by
squeezing the O.D. of the seal. Parts are to be handled on the flat
surfaces rather than the O.D. These parts will not work if they are
cracked or broken. Light flaking of the material is acceptable. If
resistance is encountered when installing stem seals over the stem,
use follower to gently push the stem seal down. If metal stem
washer(s), 2
1 /
2
"-10" sizes only, and/or Belleville washer(s) were
furnished on valve, they must be reused.
Valves with a pressure relief hole in the ball (V3) must be
reassembled and installed with the hole upstream (end connector
side) to ensure that cavity relief is upstream when valve is closed.
Any valve with the V3 option 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.
For all valves, except for valves with V20, V33 or V38 options,
which are assembled dry, lightly lubricate the ball, seats, body
seal, stem seal(s), and thrust bearing(s), with a lubricant
compatible with the media being handled. White petroleum jelly is
a good general purpose lubricant. For oxygen prepared valves
(prefix “X”) use a PTFE-based lubricant such as Fluorolube S-30
or equivalent.
1 /
2
"-1 1 /
2
" One-Piece Valves:
a. On all except the 1 /
2
" size, install the far seat in the body cavity.
b. Place new thrust bearing(s) on stem and insert assembly
through body cavity. Place new stem seal(s), stem seal
protector (if any), and the follower in position. 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 generally interchangeable.
NOTE: Anti-static fire-rated valves (AF82 & AF83) use a graphite stem
seal which is metallic silver gray in color. Also a black, carbon-filled
fluoropolymer or a gray graphite thrust bearing must be used for
proper grounding of the stem to body.
c. Place two new Belleville washers in position with the larger
diameter sides touching each other.
For those 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).
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.
d. Replace separate stop and handle or one-piece handle and stop
(if manual valve), lockwasher and handle nut on stem. (This
step is not applicable to valves with self-locking stem nut.)
e. Install far seat ( 1 /
2
" valves only), ball, body seal, second seat
and end plug. When end plug and body are metal-to-metal,
end plug raised face may project up to .009" beyond flange
surface. End plug must be fully tightened against machined
Flow Control Division
Worcester Controls