118 Agilent 1200 Preparative Pump User Manual
7 Maintenance
Simple Repairs
Removing an Outlet Ball Valve (Top of the Pump Head)
1 Disconnect the solvent outlet capillary at the valve adapter, with a 1/4 inch
wrench. Beware of leaking solvents.
2 Using a 17-mm wrench loosen the outlet valve adapter and remove the valve
adapter from pump head.
3 Lift the valve adapter out of the housing in the pumphead.
4 With a pair of tweezers carefully remove valve assembly.
Replacing an Inlet/Outlet Valve
1 Before inserting the new valve assembly, clean the valve adapter by placing
it into an ultrasonic bath, if it shows visible signs of contamination. Clean
the valve housing in the pumphead by filling a syringe with alcohol and
flushing the housing thoroughly.
2 Insert a new valve assembly into the valve adapter. The arrow on Figure 25
on page 117 indicates the flow direction. Make sure the valve assembly is
fully inserted into the valve adapter.
3 Insert the valve adapter with the new valve assembly into the housing and
screw tight.
4 Reconnect all capillaries and tubings.
When If internally / externally leaking (back flow)
Tools required • Wrench 17 mm
• Wrench 1/4 inch
Parts required # Part number Description
1 G1361-60012 Valve assembly
The outlet valves do not necessarily have to be replaced in pairs. Use the built in Leak Test
(see “Prep Pump Leak Test Description” on page 98) to identify the valve, that is not
working properly.
The side of the valve assembly that has the two holes must always face in flow direction!
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