4.3
Pump Head Configuration
The picture below shows components of the IP300 pump head. Use this as a reference for
parts replacement.
1. Pump Head
2. Piston Seal and small O-Ring
3. Seal Backup Washer
4. Large O-Ring
5. Piston Housing
6. Flush Seal
7. Seal Backup Plate
8. Metal Spring
9. Piston Adapter
10. Piston
11. Bearing
12. Spacers
4.4
Cleaning Check Valves
Check valves need periodic cleaning to avoid clogging up of solvents. When left unwashed,
dried solutions may leave crystallized deposits inside the check valves. One way to clean
check valves is to pump laboratory-grade detergent by using prime purge mode and then
flush out the detergent with distilled water. If this method does not work, remove the tubing
from both the inlet and outlet check valves and use a wrench to unscrew the check valves
from the pump heads. Place the check valves in a beaker filled with alcohol or distilled
water and give them an ultrasonic bath for 10 to 20 minutes. Make sure to place the inlet
check valves to the inlets and the outlet check valves to the outlets. Tighten them firmly
with your own hands and use a wrench to provide extra tightening (turn the wrench about 60
to 90 degrees more).
DO NOT OVER-TIGHTEN THE CHECK VALVES!
The most
common damage to check valves is the crashing of seat holder, caused by excessive
tightening. “Firm feeling” is sufficient for tightening check valves.
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