Agilent InfinityLab LC Series Multicolumn Thermostats User Manual 133
9 Maintenance
Maintain the Column Switching Valve
1 Remove capillaries from ports.
2 Loosen each fixing stator screw two turns at a time. Remove the bolts from
the head.
3 Remove the stator head (and stator face if applicable).
4 Remove the stator ring.
5 Remove the rotor seal (and isolation seal if damaged or contaminated).
6 Install the new isolation seal (if required). Ensure the metal spring inside the
ring faces towards the valve body.
7 Install the new rotor seal.
8 Replace the stator ring. Ensure the stator ring is flush with the valve body.
9 Place the new (if required) stator face in place on the stator head. Reinstall the
stator head.
10 Insert the stator screws in the stator head. Tighten the screws alternately two
turns at a time until the stator head is secure.
11 Reconnect the pump capillaries to the valve ports.
12 Perform the System Pressure Test to ensure the valve is leak tight.
CAUTI ON
Wrong use of the System Pressure Test may damage valve.
Always select an appropriate pressure limit for the test. Do not exceed the
maximum pressure of pressure sensitive components, for example, set the
Maximum Pressure to 800 bar, if an 800 bar Quick Change Valve Head is
installed.
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