Vacuum Check Valve: Testing and Inspection

Fig. 78a Testing Check Valve:

1. Remove check valve from vacuum line.
2. Check that air blows from the orange pipe through to the black pipe without resistance. Fig. 78a
3. Air should NOT flow from the black side through to the orange side.
4. If a problem is found, replace the check valve.
5. Reinstall the check valve in the vacuum line.