Flowserve J Series Ball Valve - Manual (Page 2)

Flow Control Division
McCANNA/MARPAC Valves
2 1 /
2
" - 2" JRP1/JRP3 One-piece, Flanged Ball Valves FCD MMAIM2011-00
REBUILDING
a WARNING: BALL VALVES CAN TRAP PRESSURIZED FLUIDS IN
BALL CAVITY WHEN CLOSED.
Special handling and cleaning procedures are necessary for oxygen
and vacuum service valves. Refer to industry practices when
overhauling these units
If the valve has been used to control hazardous media, it must be
decontaminated before disassembly. It is recommended that the
following steps are 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.
Disassembly of Valve:
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 and seat back seal (if any).
Place valve in closed position and remove the ball.
NOTE : If required, end plug disassembly tools are available from your
supplier or from Flowserve.
Removing Stem Assembly
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.)
Remove retaining or self-locking stem nut. Prevent stem from turning
with wrench.
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.
Remove and discard stem seal(s), stem seal protector (if any), thrust
bearing, and thrust bearing protector (if any), which may be on the
stem or in the body stem cavity. Remove and discard the far seat and
the seat seal (if any). Retain the follower.
Visual Inspection:
The ball and the surfaces against which the seats and seals 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 finger tips are acceptable.
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.
Reassembly
Lightly lubricate the ball, seats, body seal, stem seal(s), stem seal
protector and seat back seals (if any), thrust bearing, and thrust
bearing protector (if any), with a lubricant compatible with the
media being handled. White petroleum jelly is a good general
purpose lubricant.
On all except the 1 /
2
" size, install the far seat and seat back seal (if any)
in the body cavity.
The seat should appear to sit flat into the back of the cavity indicating
that the seat back seal is properly located on the seat. If the seat back
seal is not correctly positioned it could be damaged or cause the
valve to leak.
For stem area rebuilding, refer to exploded view and also the stem
build illustrations on the following pages that pertain to the valve
being rebuilt.
Order of Assembly:
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. PEEK thrust bearing and stem seal protectors
are placed outside of seals and bearings. The seals/bearings must
contact the body.
NOTE : For valves having graphite stem seal(s), care must be taken
when installing the graphite parts because they are easily damaged by
squeezing the OD of the seals. Handle gently by holding seal(s) on flat
surfaces rather than on the OD. If resistance is encountered when
installing seal(s) over the stem, use follower to gently push the stem
seal(s) down.
Stem seals, stem seal protectors and thrust bearings that are the
same size and color are interchangeable.
Place two new Belleville washers in position with the larger diameter
sides touching each other.
For those valves with single-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.
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.)
Install far seat and seat back seal (if any) ( 1 /
2
" valves only), ball (see
Caution below), body seal, second seat and seat back seal (if any) and
end plug. When end plug and body are metal-to-metal, end plug face
may project up to .009" beyond surrounding serrated surface. End
plug must be fully tightened against machined step in body. If in
doubt, assemble end plug without seat and seal, make a witness
mark, and reassemble the full assembly.
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.