Cashco SAP - Manual (Page 6)

IOM-SAP 6
3. Slide seat (21) over the lower end of the cage.
Place cage over plug into the body. Ensure
that the cage/seat are not cocked to one side.
4. Position seat retainer (37) on shoulder of plug.
NOTE: Flat surface of retainer touches guide
bearing. Install o-ring (39) on inner shoulder
of plug.
5. Align hole in clamp ring (42) with dowel pin
(43) and install clamp ring on cage (19).
6. Slide new dynamic seal (27) over end of guide
bearing. Ensure u-cup seal (27) is oriented
with the center-open-down wards as shown in
Fig ure 1, as the u-cup seal de pends upon the
P1-Inlet pressure to activate prop er seal ing
ac tion.
7. Carefully position guide bearing (13) over
plug and into the cage.
8. Place a new u-cup seal (35) with the center-
open-upwards into the recess at the top of the
guide bearing. Place the seal retainer (36) on
top of the guide bearing.
9. Thread nut (40) on to plug threads and tighten.
Torque to 120-130 ft. lbs.
10. Place new loading chamber seal (28) in
recess in the body fl ange face. Set loading
chamber on top of body. Align matchmarks
from step B.3. and insert nuts and bolts (11 &
12). Tighten bolting equally in a star pattern.
Torque to 35-40 ft. lbs.
For 3" & 4" Sizes:
1. Insert the return spring (22) into the body (23).
2. Secure the lower part of the valve plug (20) in
a bench vise; grasp in "smooth jaws" directly
under plug's seating disc portion on hub "fl ats"
provided. Do not hold on the ma chined sur face
in the plug's spin dle area.
3. Slide seat (21) over the lower end of the cage.
Lower and position cage over plug. Ensure
that the cage/seat are not cocked to one side.
4. Place seat retainer (37) on shoulder of plug.
NOTE: Flat surface of retainer touches guide
bearing Install o-ring (39) on inside shoulder
of plug.
5. Slide new dynamic seal (27) over lower end
of guide bearing. Ensure u-cup seal (27) is
oriented with the center-open-down wards as
shown in Fig ure 1, as the u-cup seal de pends
upon the P1-Inlet pressure to activate prop er
seal ing ac tion.
6. Carefully position guide bearing (13) over plug
and into the cage.
7. Place a new u-cup seal (35) with the center-
open-upwards into the recess at the top of the
guide bearing. Place the seal retainer (36) on
top of the guide bearing and engage threads
of cap screw (40) tight into the guide bearing.
Torque to 180 - 200 ft. lbs.
8. Remove this sub-assembly from the vise and
install it inside the body cavity.
9. Place new loading chamber seal (28) in recess
in the body fl ange face. Place new o-ring (41)
on top edge of cage. Set loading chamber on
top of body. Align matchmarks from step B.3.
and insert cap nuts and bolts (11 & 12). Tighten
bolting equally in a star pattern. Torque to
35-40 ft. lbs.