Routine Maintenance: Inlets
Maintaining a PTV
Released: March 2004 6850 Series II GC User Information page 153 of 256
3. Unscrew the sealing element from the head. Carefully remove the Viton
seal and the pressure spring.
4. Unscrew the guide cap from the head and remove the Teflon ferrule.
Caution Do not use a sharp object to extract the valve body—this can leave scratches that
cause leaks.
5. Insert a syringe with a 23 gauge needle carefully 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 so far out that you can grasp it with your fingers.
6. Remove the seal from the valve body.
7. Carefully clean all components in hexane.
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.
9. Use this opportunity to check the Teflon ferrule. If it must be replaced, see
page 154 for instructions.
10. Check the entire system again for leaks; if necessary, carefully retighten
the guide cap slightly more with the syringe needle inserted and/or replace
the Kalrez seal.
11. If the head leaks when a syringe is inserted, the Teflon ferrule is the
problem. If the head leaks without a syringe inserted, the seals may need
to be replaced.
Guide cap
Teflon ferrule, 5182-9748
Kalrez® seal, 5182-9759
Valve body, 5182-9757
Pressure spring, 5182-9758
Viton seal, 5182-9775
Sealing element, 5182-9760
Carrier gas line
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