Flowserve CPT Series Metal Characterized Seat Control Valve - Manual (Page 5)

17812-N Metal Characterized-Seated Control Valve !?4
" –4" CPT 44 and !?2
" –4" CPT 51/52 Installation, Operation and Maintenance 5
s. Place new thrust bearing onto stem and insert through body
cavity. The thrust bearing can be distinguished from the stem
seals by the darker color of the 25% filled fluoropolymer used in
the thrust bearing. A graphite stem seal which is metallic silver
gray in color is larger than the thrust bearing. Stem seals and
thrust bearings of the same size and color are generally
interchangeable.
t. Assemble new stem seal(s) over the top of the stem and down
into the recess in the top of the body. For Revision R1 and R2
valves only, install a new PEEK stem seal protector over stem
seals. The follower is assembled on top of the stem seal(s). If the
stem seal does not easily seat into the body recess, use the
follower to gently push it in place. Place spacer onto the valve
stem. For valves with graphite stem seal and all Revision R1 and
R2 valves, add two Belleville washers with large diameter sides
touching each other and do not use stem spacer.
u. Place retaining nut on stem. Using a wrench to prevent rotation,
tighten retaining nut to fully compress packing, then back off 1/6
turn. Excessive tightening causes higher torque and shorter stem
seal life. For graphite stem trim, tighten retaining nut to fully
flatten Bellevilles, then back nut off !?6 turn.
v. With the valve in the closed position (stem groove going across
pipeline), place ball inside the body cavity engaging the stem
slot. Assemble body seal into its recess in the body making sure
that it is seated properly. (Caution: If the body seal is installed on
the end plug, it will be damaged.) Assemble round port seat and
seat back seal (used with “A” or “G” filled metal seats only) into
the seat recess of the end plug. Then slide the end plug into the
body as far as it will go.
w. Finally, secure end plug in place by threading in the end plug
retaining set screws, and tightening each one firmly. Proper
installation will allow not more than .010" protrusion of the end
plug beyond the valve body.
Upon reinstallation of the valve in the line, retighten the end plug
retaining screws after the flange bolts are fully torqued up.
After the valve is assembled, it should be cycled a few times to ensure
that the valve operates smoothly with no chattering of the ball. The
normal operation is an initial high torque to “break” from the closed
position to a smooth running lower torque mid-cycle, to a high torque
at the end of the 90° cycle or open position. The torque is similar
when closing.
When ordering parts, please provide the part name and the
following information from the valve nameplate or mounting bracket
nameplate: Valve Size, Style and Revision Number, e.g.,
!?2
" CPT 44 46 GG SE G30 R1 Ball; or for non-standard product,
valve size and “P” number, “T” number, “C” number, or similar e.g.,
1" CPT 44 66 XG SW A30 T0726 Stem.
The terminology shown in the following exploded view parts listings
is standard.
Flow Control Division
Worcester Controls
3" and 4" 150# and 300# Flanged Construction
3" and 4" 151/301 Wafer Construction