9. Loosen and remove the outlet cage.
10. Remove the outlet poppet, outlet poppet spring, outlet
poppet guide, and outlet poppet seat. Place these items to
the side.
Note: It is important to lap the check valve body with the
outlet poppet and seat removed to prevent contamination
when lapping.
Lap inlet face of check valve body
and inlet poppet
11. Use the glass lapping plate from the tool kit and
320 grit lapping paper from the repair kit.
12. Lightly wet the paper with water. Place the inlet face of the
check valve body 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 re
-
peat until the surface has a smooth matte finish free of de
-
formation from the inlet poppet.
13. Lap the inlet check valve poppet in same method.
14. Thoroughly clean the check valve body openings and inlet
poppet to remove particles from the lapping process.
© Flow International Corporation M-416 | 47
CHAPTER 4
Service
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