Flowserve Cryogenic Three-Piece Bodied Extended Bonnet Ball Valve - Manual (Page 3)

17646-L Cryogenic Three-Piece Bodied Extended Bonnet Ball Valve: Installation, Operation and Maintenance 3
IV. REBUILDING:
THIS MANUAL CONTAINS EXPLODED VIEWS OF THE VALVES
COVERED BY THE TEXT. THEY HAVE BEEN INCLUDED TO AID IN
THE REBUILDING OF VALVES. PLEASE REFER TO THEM WHEN
FOLLOWING THE WRITTEN INSTRUCTIONS.
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.
A. A standard repair kit can be ordered for the Worcester Cryogenic
Valve containing all necessary parts for normal valve rebuilding
(all seat springs, and Belleville washers). To order a repair kit you
must specify the size, “CRK44”, and revision letter (“R” and
number). This information will be found in the valve code on the
valve body, stop plate, handle, valve nameplate or mounting
bracket nameplate. Example:
1 /
2
" CRK44 R6
If the valve is a non-standard product, then there will be a 5
character suffix in valve code called a “P”-Number, “T”-Number,
“C”-Number, or similar found on the valve body, stop plate, handle,
valve nameplate, or mounting bracket nameplate. To order repair
kit includes size, “CRK44”, and “P”, “T”, “C”, or similar number.
Example:
1 /
2
" CRK44 P2577 or 1 /
2
" CRK44 T0914
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.
B. If replacement parts other than those included in the repair kit are
needed, order the part by name and size, and include the
complete valve code; and for non-standard product add “P”, “T”,
“C”, or similar number found on valve body, stop plate, handle,
valve nameplate, or mounting bracket nameplate.
Example:
Ball; 1 /
2
" C416 PM SE R6 or
Ball; 1 /
2
" C466 PM SE T0914
Porting (if diverter cryogenic valve) must also be specified when
ordering these parts:
Example:
Ball; 1" C416 PM SE V1 R6
To Replace the Seats and Rings in 1 /
4
" - 2" Cryogenic Valves:
C. 1. Open valve.
2. Remove three body bolts and loosen fourth to swing the
center section out from between pipe ends or remove all four
bolts to remove valve from line, whichever is more
convenient.
3. Close valve and remove the ball, seats and fluoropolymer
coated stainless steel gasket body seals. Discard seats and
gaskets.
4. Remove handle nut, lockwasher, handle and stop (if manual
valve), retaining nut, Belleville washers, and top packing
follower. For Rev. R7 actuated valves remove self-locking
stem nut, Belleville washers, and top packing follower.
5. a. Push stem into the body cavity.
b. Remove split ring and split thrust bearing from recessed
diameter above stem tang.
c. Remove stem from top of valve.
d. Remove packing ring, bottom packing follower, and thrust
bearing(s) from stem.
6. Clean all sealing surfaces of valve including ball.
NOTE: 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 fingertips are acceptable. The stem and body
surfaces that the thrust bearings and packing ring contact
must be undamaged, clean and free from pit marks or
scratches.
To Reassemble:
7. a. Insert stem down through the bonnet and extension into
the body cavity.
b. Place new split thrust bearing in the recessed diameter
above the stem tang. Place new split ring (two pieces) in
recessed diameter, under split thrust bearing. Pull stem
up so split thrust bearing and split ring are withdrawn
into the stem hole recess in the ball cavity. (IMPORTANT:
Thoroughly lubricate the split thrust bearing and the split
ring with a lubricant compatible with media. White
petroleum jelly is a good general purpose lubricant.)
c. Install, over extended stem, two new thrust bearings,
bottom packing follower, new packing rings (three
pieces), and top packing follower. (IMPORTANT: Lightly
lubricate thrust bearing packing and follower with a PTFE-
based lubricant such as fluorolube S-30 or equivalent,
except for valves with V20 or V33 options, which are
assembled dry.
NOTE: Polyfill thrust bearings (black in color) are now
used and included in repair kits. If PEEK thrust bearings
(tan in color) were removed, they must be replaced with
the Polyfill.
Flow Control Division
Worcester Controls