Lap inlet face of check valve body
13. Use the glass lapping plate from the tool kit and
320 grit lapping paper from the repair kit. Lightly
wet the paper with water.
14. Place the check valve body with the inlet face
against the lapping paper. With a light downward
pressure, lap the body in a figure-8 pattern.
CAUTION
Be very careful not to rock the check valve body
while lapping the surface—flatness is very critical.
After 10-12 laps, rotate the check valve body 45°
and continue lapping until the surface has a smooth
matte finish free of any deep scratches or signs of
deformation from the inlet poppet. Re-wet the pa
-
per as needed.
15. Thoroughly clean the check valve body openings to
remove particles from the lapping process.
Installation and reassembly
Assemble the check valve
1. Insert the new outlet poppet into the new outlet
poppet guide.
Note: Install poppet into the outlet poppet guide as
shown, with the radiused back of the outlet poppet
going in first. The counterbore in the outlet poppet
is visible after installation
2. Place the new outlet poppet spring around the
guide. The spring should be loose on the guide.
3. Place the assembly into the outlet cage along with
the outlet poppet seat.
4. Hold the outlet cage assembly (threaded end of the
outlet cage facing up), so that the installed compo
-
nents will not fall out. Apply a thin film of Blue Lu
-
bricant to the threads of the outlet cage.
5. Carefully thread the check valve body onto the
outlet cage assembly.
6. Secure the check valve body in the rebuild clamp
with the inlet face downward.
7. Secure the rebuild clamp in a vise. Torque the outlet
cage to 30 ft-lb (41 N-m).
Repeat Steps 1–7 for the remaining check valves.
58 | M-416 ©FlowInternationalCorporation
HYPLEX PRIME PUMP
Maintenance & Service Manual
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