Application
Routing Powder to Multiple Destinations in Chemicals
Answer in brief
One source feeding several reactors or silos is normal in chemical plants, and the junction is where products meet.
Residue left at a diverter after a changeover is the most common route for cross-contamination in an otherwise closed system.
- Choose a diverter geometry that leaves no pocket.
- State the leakage you can accept across the closed leg.
- Match the materials to the product and the cleaning agent.
Reviewed October 21, 2026 · Updated October 21, 2026
The problem
A diverter in a chemical line has to seal against conveying pressure, resist the product and leave no residue behind for the next grade.
Designs with a dead pocket at the junction defeat an otherwise clean changeover procedure.
Desired outcome
A junction that sends the full stream to the selected destination, leaves nothing behind for the next one and holds the line pressure while it does so.
Process approach
Flex tube designs move a flexible hose between outlets and leave almost no dead volume, which makes them the usual choice where changeover matters.
Seal tite plug designs hold higher line pressures and are used where leakage across the closed leg has to be very low.
Wye and pivoting designs suit gravity flow rather than pressure conveying.
- Junction geometry chosen for the changeover requirement.
- Seals and body materials selected against the full product list.
- Position feedback so the control system knows the real state.
Selection factors
- Line pressure and the acceptable leakage across the closed outlet.
- Number of products and the cleaning method between them.
- Corrosion behavior of the products and cleaning agents.
- Abrasiveness, which decides junction wear.
- Whether position feedback is required for the batch record.
Common failure modes
- Residue in the junction carried into the next product
- Leakage across the closed leg into the wrong vessel
- Valve position assumed rather than confirmed
- Junction wear opening a leak path over time
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