Installing the HyPlex® Prime Major Maintenance Kit
SB-0259 Rev A Status: PRODUCTION
4 of 10
2011 Flow International Corporation
UNCONTROLLED COPY
PRINTED 7/29/11
14.
Place the end cap vertically on a work bench with the check valve end up.
15.
Remove the check valve assembly from the end cap: use two pry bars in the circumferential groove
in the OD of the check valve body, prying gently on the body. Be careful not to damage the end
cap.
16.
Place the check valve body in a soft-jawed vise. Loosen the outlet cage.
17.
Remove the outlet poppet and guide, outlet poppet spring, and outlet poppet seat from the outlet
cage. Retain the cage. Discard the outlet poppet and guide, outlet poppet spring, and outlet poppet
seat.
Lap inlet face of check valve body
18.
Use the glass lapping plate from the tool kit and lapping paper from the repair kit.
19.
Lightly wet the paper with water. 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 paper as needed.
20.
Thoroughly clean the check valve body openings to remove particles from the lapping procedure.