In automated fluid dispensing equipment, the Screw Dispensing Valve and Jet Dispensing Valve are the two most commonly used high-precision types with significant differences.
Screw Dispensing Valve: Motor-driven screw, volume proportional to rotation, precision ±1%, immune to pressure fluctuations, full viscosity range. Limitations: contact, speed limited (50/sec), regular cleaning needed.
Jet Dispensing Valve: Piezoelectric/pneumatic striker, non-contact micro-droplet jetting, speed 200+/sec, min volume 0.5nl. Limitations: low-medium viscosity only (<20000cps), 1-5mm distance, higher cost.
Comparison: Screw→contact ±1% medium-speed full-viscosity flat surfaces; Jet→non-contact ±2% high-speed low-medium-viscosity concave/precision surfaces.
Selection: PCB sealing→Screw; IC underfill→Jet; Thermal silicone→Screw; High-speed UV→Jet.
As the core execution component of automated fluid dispensing equipment, correct selection of the Dispensing Valve is key to ensuring dispensing process quality.
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