Cleaning and replacing check valves 4-19
Replacing the inlet check valve
To replace the inlet check valve:
1. Purge the pump with methanol as described in “Purging the system” on
page 3-17. If methanol is not miscible with your current eluent, use an
intermediate eluent.
2. Disconnect the eluent supply line from the inlet manifold on the pump.
3. Disconnect the outlet tubing from the pump and install a fitting plug
into the outlet. Tighten the plug with the 5/16-inch wrench.
4. Insert the priming syringe into the luer fitting at the center of the
draw-off valve handle, then turn the handle counterclockwise about 1/2
turn to open the valve.
5. Use the syringe to withdraw all the methanol.
6. Use the 5/16-inch open-end wrench to disconnect the tubing from the
inlet and outlet check valves of the pump head. If you notice that a check
valve turns while you are disconnecting the tubing, use the 1/2-inch
wrench to hold the check valve in place.
Disconnecting the inlet tubing
Caution: Before you continue with this procedure, lower the
eluent reservoir to eliminate gravity flow of eluent.
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