Thermo Scientific Dionex Aquion RFIC Operator's Manual page 93

Thermo Scientific
Figure 28. Pump components
Secondary pump
head
5. Using a 1/2-inch wrench, loosen both check valve assemblies. Remove the check valve
assemblies from the pump head.
Note The inlet check valve assembly housing has a 1/4-28 port. The outlet check valve
assembly housing has a 10-32 (smaller) port (see
Figure 29. Inlet and outlet check valve assemblies
Inlet check valve
1/4-28 port
Inlet check valve
cartridge (double-hole
end visible)
Flow
6. If you are installing new cartridges (P/N 045994) in the existing check valve housings:
• When placing the cartridge in the inlet check valve housing, be sure the double-hole
end of the cartridge is visible (see
the housing and install it correctly.
• When placing the cartridge in the outlet housing, be sure the single-hole end is visible
(see Figure 29). If it is not, remove the cartridge from the housing and install it
correctly.
IMPORTANT If you do not orient the check valve cartridges correctly, the pump will
not operate properly (and may be damaged). Liquid must enter the check valve
through the large single hole and exit through the small double holes.
7. Install the inlet check valve assembly (P/N 045722) on the bottom of the primary pump
head.
8. Install the outlet check valve assembly (P/N 045721) on the top of the primary pump
head.
Cleaning and Replacing the Pump Check Valves
Outlet check valve
Primary pump head
Acorn nut
Inlet check valve
Figure 29).
Flow
Figure 29). If it is not, remove the cartridge from
Dionex Aquion RFIC Operator's Manual
6
Service
Outlet check valve
10-32 port
Outlet check valve
cartridge (single-hole
end visible)
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