Evaporative Check Valve: Testing and Inspection

Fig. 4 Tank pressure control valve check:

1. Remove rubber hoses from valve, Fig. 4.
2. Apply vacuum to pipe (A) and blow air into inlet pipe (B). Ensure valve is open.
3. Apply pressure to inlet pipe (B) with outlet pipe (C) capped. Ensure air does not pass through valve.
4. If valve does not operate as specified, replace valve as required.