What To Do If You Detect A Leaking Valve; Removing Differential Pressure From A Leaking Valve; Repairing Or Replacing A Leaking Valve; Repairing Valves On The Analysis Manifold - Micromeritics ASAP 2020 Confirm Operator's Manual

ASAP 2020 Confirm

What To Do If You Detect a Leaking Valve

If you determine that a specific valve is leaking, remove differential pressure from the valve
and continue testing the remaining valves for leaks.
As an alternative, you may repair or replace the leaking valve after removing the
differential pressure on the valve. However, opening the analysis system to
replace or repair a valve exposes the analyzer manifold to atmospheric gases and
moisture. These gases and moisture greatly increase the time required to
evacuate the analyzer and prepare it for further testing or operation.

Removing Differential Pressure from a Leaking Valve

1. Select either of the following actions:
• Close the regulator outlet valve for the gas supply line to the valve.
• Reinstall the plug that was removed to test the valve.
2. Open the leaking valve.
3. Evacuate the analyzer until you obtain an outgas rate of less than 0.7 mHg per minute.
Refer to
outgas rate for specific valves.

Repairing or Replacing a Leaking Valve

Whether you repair or replace a valve depends on the type of valve that is leaking.
• Valves on the Analysis manifold should be repaired
• Valves on the Degas and inlet manifold should be replaced.

Repairing Valves on the Analysis Manifold

1. Backfill the manifold with nitrogen to approximately 800 mmHg.
• Close off the helium gas supply if you are repairing the helium inlet valve.
• Turn off the vacuum pump system if you are repairing a vacuum valve.
2. Remove and replace the plunger and the thin gasket on the leaking valve.
D-8
Testing Individual Valves for detailed instructions on determining the
, page D-1
Appendix D
202-42811-01 - Mar 2011