Waters Prep Series Installation And Maintenance Manual page 137

To reassemble inlet check valves:
1. Position the retainer cup so that you can look down into it.
2. Insert the sleeve into the retainer cup.
3. Place the ball in the retainer cup.
4. Place the seat guide over the ball with the shiny side of the seat facing
the ball.
5. Place the seal into the check valve housing and press into place.
6. Lower the housing carefully over the stack of parts and invert the
assembly.
7. Place the housing seal into the threaded hole on the bottom of the pump
head.
8. Screw the assembly up into the pump head being careful to not tip the
housing.
9. Firmly tighten the inlet check valve and attach the tubing.
To disassemble outlet check valves:
1. Shut down the controller, and disconnect the power cord. The
proportioning valve stops all solvent lines.
2. Disconnect the tubing from the outlet check valve, and loosen the outlet
check valve with a 1/2-inch open-end wrench.
3. Disassemble the check valve assembly with a forceps.
4. Check the retainer cup. Also check the ball and seat assembly for
damage or debris. The
shows the outlet check valve assembly in an exploded view.
5. Clean and replace worn or damaged parts.
figure "Outlet check valve assembly" on page 3-54
Maintenance procedures 3-53