Flowserve CPT Series Metal Characterized Seat Control Valve - Manual (Page 4)

4 Metal Characterized-Seated Control Valve !?4
" –4" CPT 44 and !?2
" –4" CPT 51/52 Installation, Operation and Maintenance 17812-N
A?f
"– 2" CPT 44 Valves:
Revision RO Valves:
a. Place new thrust bearing on stem and insert through body cavity.
The stem seal is generally thicker than the thrust bearing.
b. Place new stem seal, new stem seal protector of PEEK material
(only if valve has High-per Fill (“X”) seat on one end), follower
and (2) new Belleville washers, with outer edges touching, on
stem. If the stem seal does not easily go down over stem or into
the body, use the follower to gently push the seal down.
c. Place bottom retaining nut on stem and, using a wrench to
prevent rotation, tighten retaining nuts as noted in Paragraph C
(Maintenance). Excessive tightening causes higher torque and
shorter seal life. For graphite stem trim, tighten retaining nut to
35 inch pounds, do not bottom.
Revision R1-R4 Valves:
d. Place a new PEEK thrust bearing protector (except for Revision
R1 valves) and a new thrust bearing on the stem and insert
assembly through body cavity. Place a single new thick stem seal
or a new thin stem seal and a new thick stem seal, depending on
seat material, a new stem seal protector, and the follower in
position. Stem seals, stem seal/thrust bearing protectors and
thrust bearings that are the same size and color are generally
interchangeable.
e. Add (4) new Belleville washers (two pairs of Belleville washers
must have the larger diameter sides touching each other).
f. Place the self-locking stem nut on stem and, using a wrench to
prevent stem from turning, tighten as noted in Paragraph C
(Maintenance).
Revision R0-R4 Valves:
g. With the valve in the closed position (stem flats going across
pipeline), replace ball, seats and seat back seal(s) (used with “A”
or “G” filled metal seats only). The characterized seat has a “V”
or “Slot” cut in it for improved flow control. It must be properly
oriented to function and the seat can only fit in the pipe end with
an oversized port hole. A locating pin is provided in the body and
a groove in the seat to assure that proper alignment is
accomplished. This valve seat can only be assembled one way
and must fit properly, not jam, on the pin. The opposite seat has
a standard round port in it.
h. Open the valve and add body seals (if coated stainless steel “S”
gasket body seals are used, install them with wide flange facing
the body. See View A-A on page 6). Before putting the center
section between the pipe ends, make sure that the seat back seal
is located on the seat correctly. If it is not, it could be damaged
or cause the valve to leak.
i. Place center section between pipe ends by separating the pipe
ends from the body by at least !?8" to allow locating diameter on
the back of the metal characterized seat (for insertion into
oversized pipe end bore) to clear pipe and flange. Replace
actuator and body bolts and evenly tighten and torque the body
bolts to the figures in Paragraph A.3.h.
A?s
"– 2" CPT 51/52 Valves (All Revisions):
j. On all sizes except the !?2", insert far (characterized) seat and seat
back seal. The seat has a “V” or “Slot” cut in it for improved flow
control, and must be properly oriented to function. A locating pin
is provided in the body, and a groove in the seat, to assure that
proper alignment is accomplished. This valve seat can only be
assembled one way and must fit properly, not jam, on the pin.
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.
k. Place a new PEEK thrust bearing protector and a new thrust
bearing on the stem and insert assembly through body cavity.
Place a single new thick stem seal or a new thin stem seal and a
new thick stem seal, depending on seat material, a new PEEK
stem seal protector, and the follower in position. Stem seals,
stem seal/thrust bearing protector and thrust bearings that are
the same size and color are generally interchangeable.
l. Add (4) new Belleville washers (two pairs of Belleville washers
must have the larger diameter sides touching each other).
m. Place the self-locking stem nut on stem, and using a wrench to
prevent stem from turning, tighten as noted in Paragraph C
(Maintenance).
n. (Insert the far [characterized] seat and seat back seal into A?s"
valves per Paragraph j.)
o. With valve closed, install ball, opposite seat, seat back seal (used
with “A” or “G” filled metal seats only) and body seal (if coated
stainless steel “S” gasket body seal is used, install it with wide
flange facing center of valve. See View A-A on page 6). The
opposite seat has a standard round port in it.
p. Install end plug into body until body and end plug are metal to
metal. The end plug 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.
3"– 4" CPT 44/51/52 Valves (All Revisions):
q. Assemble the far (characterized) seat insert and seat (A or G
filled metal), or for Revision R2 and later valves only, one-piece
characterized seat, and seat back seal into the body cavity. The
one-piece characterized seat or seat insert has a “V” cut in it for
improved flow control and must be properly oriented to
function. To assure that proper alignment is accomplished,
Revision R0-R1 valves have a locating pin provided in the body
cavity, and a groove in the seat insert. This valve seat insert can
only be assembled one way and must fit properly, not jam, on
the pin. For Revision R2 and later valves, the one-piece seat has
a locating nib that aligns with a groove 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.
r. Reinstall stem centering washer(s) into the recesses in the body.
When only one washer is used, it goes inside recess on top of
the body and under the stem seal(s).
Flow Control Division
Worcester Controls