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Conveying System Mechanical Components Chapter 3: Installation 52 of 138
Figure 26: 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.