72 Maintenance Procedures
Figure 4-12 Outlet Check Valve Removal
Cleaning the Outlet Check Valve
Clean the check valve by sonicating in water, followed by sonicating in methanol. Replace
worn or damaged parts as necessary.
Installing the Outlet Check Valve
If there is no improvement, install a new outlet check valve:
1. Hold the outlet check housing so you can look down into it (Figure 4-13). Drop the
rulon washer in the housing. Place the housing aside.
2. Hold the retainer so the cupped side of the retainer faces up. Place the retainer with
the rulon washer in the housing. Place the insert into the retainer. Place the ball in
the insert.
3. Position the seat over the ball, with the shiny side facing the ball. Add in order the
rulon washer, filter retainer, cup filter, and rulon washer.
4. Fit the retainer with the insert, ball, and seat, into the outlet housing. To insert the
retainer and other parts into the housing without dropping parts or misaligning them,
hold the retainer and with forceps, insert it into the stainless steel housing. Turn the
housing and retainer right side up again.
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