Flowserve 82 Series Flanged One-Piece - Manual (Page 2)

2 18510-P
Flow Control Division
Worcester Controls
C. MAINTENANCE
Tighten retaining nut if seepage is noted at stem.
CAUTION: For maximum stem seal life, proper stem adjustment
procedure must be followed. Excessive tightening causes higher
torque and shorter stem seal life.
For 1 /
2
"-1 1 /
2
" 82/83 Valves
FOR VALVES WITH TWO STEM NUTS AND A LOCKWASHER:
1. Tighten retaining nut (lower nut) until Belleville washers are flat,
the nut will “bottom”.
2. Back off retaining nut 1 /
6
turn.
3. Tighten handle nut securely to lock retaining nut in place. (On
some automated valves, two retaining nuts are used with a
lockwasher in between. Hold the bottom nut securely with a
wrench while tightening the top nut to lock the two nuts in place.)
FOR VALVES WITH SELF-LOCKING STEM NUT:
1. Tighten self-locking stem nut until Belleville washers are flat, the
nut will “bottom”.
Back off nut 1 /
3
turn.
CAUTION: The self-locking stem nut is difficult to tighten, and
must fully flatten Belleville washers before backing off.
For 2"-10" 82/83 Valves
1. Tighten retaining nut 1 /
6
turn at a time until seepage stops.
D. REBUILDING
a WARNING: BALL VALVES CAN TRAP PRESSURIZED FLUIDS IN
BALL CAVITY WHEN CLOSED
If the valve has been used to control hazardous media, it must be
decontaminated before disassembly. It is recommended that the
following steps be taken for safe removal and disassembly:
• Relieve the line pressure. Operate the valve prior to attempting
removal from line.
• Place valve in half-open position and flush the line to remove any
hazardous material from valve.
• All persons involved in the removal and disassembly of the valve
should wear the proper protective clothing such as face shield,
gloves, apron, etc.
CAUTION: If the seats and seals installed differ from those
removed, the valve nameplate or stop must be replaced or
remarked to indicate the altered materials and ratings or valve
tagged to so indicate.
1. A standard repair kit may be ordered for the valve. Specify the
size, series, material of seats and body seal and R# (revision
number) of valve or for non-standard valves, the “P” number, “T”
number, “C” number, or similar number, as found on the
nameplate. Some series, such as AF & V51 option have their own
repair kits, which are ordered by the prefix or adding V51 suffix. If
valve body is stainless steel, place a “6” after valve size in repair
kit ordering code. (Use Series 82 designation for both 82 and 83.)
NOTE: V51 high cycle stem packing option is used on 2"-6" sizes only
and is not used with AF Series valves.
2. Special handling and cleaning procedures are necessary for
oxygen and vacuum service valves. Refer to industry practices
when overhauling these units.
3. To Disassemble 1 /
2
"-1 1 /
2
" One-Piece Valves:
a. Remove valve from line. Unscrew end plug and set aside. If
the body seal was not removed with the end plug, remove it
from the valve and discard. Remove and discard the near
seat. Place valve in closed position and remove the ball.
NOTE: If required, end plug disassembly tools are available from your
distributor or from Flowserve.
b. Remove handle nut, lockwasher, also separate handle and
stop or one-piece handle/stop (if manual valve). (This step is
not applicable to valves with self-locking stem nut.)
c. Remove retaining or self-locking stem nut. Prevent stem from
turning with wrench.
d. Remove and discard Belleville washers. Push stem into ball
cavity and remove. On the 1 /
2
" size, the far seat must be
removed before pushing stem into cavity.
e. Remove and discard stem seal(s), stem seal protector (if
any), thrust bearing, and thrust bearing protector (if any),
Example Repair Kit Orders
Valve Size Prefix RK Series Material Revision # or P, T, C, etc., Number
(if required)
3" AF RK 82 TZ R1 —-
2" RK 82 T R1 V51 —-
4" RK 82 RT —— T0914