Valve gate
Single drop shutoff pin.
Valve gateGlossary
What Is Sequential Valve Gating? Injection Molding Explained
Sequential valve gating opens mold gates in timed stages to control fill and weld placement.
Glossary
Sequential valve gating opens hot runner drops in stages to steer fill
Large flat panels use staged gates to move weld lines away from cosmetic zones.
Controllers time each valve pin so fill fronts merge where the drawing allows.
Adds hot runner cost and tuning complexity versus simultaneous fill.
Justify SVG when part size and cosmetics require the control investment.
Programs
When sequential gating is worth discussing
Not every large part needs staged valves.
- TV bezels and wide flat covers with strict cosmetic maps
- Parts where simultaneous fill creates visible weld on Class A
- Multi drop layouts with documented fill sequence in mold spec
Go deeper
Where this term connects
Each link is a different angle on the same program, not a duplicate definition.
Gate
General gate and weld vocabulary.
GateCavity pressure
Sensors verify fill stages.
Cavity pressureScientific molding
Data driven process setup.
Scientific moldingVisual reference
Photos from molding and tooling programs
Images are selected from the NetProto Forge media library for this topic.
Injection molded production parts on a tray
Injection molded production parts on a tray
Engineer reviewing a molded part drawing
Engineer reviewing a molded part drawing
Plastic housing components from a steel tool
Plastic housing components from a steel tool
FAQ
Sequential valve gating questions
Do I need SVG on my part?
Only when size and cosmetics justify hot runner and control cost.
Can SVG hide all weld lines?
It moves lines. Some witness may remain and need acceptance.
Does SVG change cycle time?
Sequence can add seconds versus simultaneous fill on some tools.
Next step
Document weld line acceptance
Upload CAD with cosmetic maps before drop sequence is frozen.