Agilent Technologies 6890 Series, Service Manual, Page: 140 / 867

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Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
Programmed Temperature Vaporization Inlet (PTV) 240
Replacement procedures
Figure 240-20 Disassembling the septumless head
3. Unscrew the guide cap from the head and remove the Teflon ferrule.
4. Carefully insert a syringe with a 23 gauge needle into the head to press
the valve body (with the Kalrez seal) slightly out of the head. Carefully
tap the head on a soft smooth surface so that the valve body falls out
completely or slips out far enough to grasp it with your fingers.
5. Remove the seal from the valve body.
6. Carefully clean all components in hexane.
7. Inspect the Teflon ferrule, seals, and valve body for damage, and replace
if necessary.
8. Assemble the head in reverse order. Make sure that you work absolutely
lint-free and that the seals and the pressure spring are not damaged.