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Types of Valve Gates for Injection Molding
Here’s a detailed types of valve gates for injection molding, which includes design features, advantages in injection molding, and typical applications for your check…
Types of Valve Gates for Injection Molding |
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| Valve Gate Type | Design Features | Advantages in Injection Molding | Typical Applications |
| Solid Wedge Valves | Monolithic rigid gate plate, no moving parts | Simple structure, high-pressure resistance, suitable for high-viscosity materials | Thick-walled products, engineering plastics (e.g., PA, PC) |
| Parallel Slide Valves | Dual parallel gate plates sealed via mechanical pressure | Excellent sealing prevents melt leakage, enables precise control | Multi-cavity molds, high-precision medical components |
| Flexible Wedge Valves | Elastic gate design with thermal expansion compensation | Adapts to mold temperature fluctuations, reduces jamming risks | High-temp materials (e.g., PEEK, LCP) or rapid thermal cycling systems |
| Bellow Seal Valves | Bellows-sealed stem completely isolates melt leakage | Zero contamination for cleanroom/medical-grade production | Medical tubing, optical lenses, food packaging |
| Split Wedge Valves | Segmented gate plates with self-adjusting angle | Self-cleaning function minimizes material residue | Biodegradable materials (e.g., PLA) or frequent color changes |
| Non-rising Stem Valves | Fixed stem with internal thread drive | Space-saving for compact hot runner systems | Small multi-cavity molds (e.g., electronic connectors) |
| Rising Stem Valve (OS&Y) | Externally threaded rising stem design | Visual operation status, easier maintenance and monitoring | Large automotive parts or molds requiring frequent adjustments |
Key Selection Criteria for Injection Molding Valves
Material Properties:
- High-viscosity materials (e.g., ABS) suit Solid Wedge or Parallel Slide valves
- Corrosive materials (e.g., PVC) require Bellow Seal designs
Mold Configuration:
- Multi-cavity molds prioritize Parallel Slide Valves for synchronized control
- Quick color changes need Split Wedge Valves
Process Requirements:
- High-temperature processes (>300°C) recommend Flexible Wedge Valves
- Medical-grade production mandates Bellow Seal Valves
Maintenance Considerations:
- Rising Stem (OS&Y) valves facilitate maintenance but require more space
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