Waters 1500-Series, Operator'S Manual

Page: 125 / 188

Replacing check valves 5-17
4. With the check valve held upright to prevent the cartridge from falling
out, hand-tighten the check valve into the pump head. Tighten the check
valve another 1/2-turn with the open-end wrench.
5. Reconnect the eluent supply line to the inlet manifold on the pump.
6. Prime the pump as described in Chapter 4 . Check for leaks.
Replacing 1525EF check valves
The 1525EF pump employs ball and socket check valve assemblies that are
installed in the pump inlet and outlet housings.
Replacing the 1525EF inlet check valve
To replace the inlet check valve:
1. Purge the pump with methanol (see Chapter 4 ). If methanol is not
miscible with your current eluent, use an intermediate eluent.
2. While holding the inlet check valve housing with the adjustable wrench,
use the 5/16-inch open-end wrench to loosen the compression screw and
remove the tubing assembly from the check valve housing (see the
figure, below).
3. Use the adjustable wrench to remove the entire check valve assembly,
including the housing, from the pump head.
4. Replace the entire old check valve housing with a new one.
Finger-tighten the new check valve housing onto the pump head.
Tighten the check valve with the adjustable wrench.
5. Reinstall the tubing assembly. Holding the housing with the adjustable
wrench, tighten the compression screw with the 5/16-inch open-end
wrench.
6. Repeat step 2 through step 5 to replace the other inlet check valves on
the pump.
7. Prime the pump as described in Chapter 4 . Check for leaks.