AEC VacTrac Series Conveying Systems - Manual (Page 56)

Figure 30: Typical Single Line Y-Tube System Installation
Material Check Valves in Single Line Y-Tube Systems
•
•
•
•
•
•
•
Check valves are a critical feature on single line Y systems. You must have a check
valve installed on the material inlet inside the receiver on all vacuum hoppers in single
line Y installations.
Check valves must open when the receiver is being loaded and seal to prevent a
vacuum leak when other hoppers are being loaded.
Vacuum receivers for these systems have a special factory-installed extended material
inlet tube to hold the check valve.
The check valve must not be pressed too far onto the inlet stub to prevent proper
sealing.
The hinge of the check valve should be up to prevent material from being deflected up
into the vacuum hopper filter.
Do not allow vacuum receivers with check valves to be over-filled to a point above the
bottom of the check valve. Over-filling prevents the check valve from sealing and
creates a vacuum loss. Adjust the conveying time on Time-Fill systems to prevent this
from happening.
Inspect periodically for erosion or wear. Replace as required.
Conveying System Mechanical Components Chapter 3: Installation 55 of 136