Product Overview

This concentric screw valve meters thick adhesives and pastes with positive displacement screws arranged for multi‑channel output. Choose 4, 8 or 16 ports to feed multiple dispense points from one compact unit. The valve handles heavy fluids up to 500,000 cP, gives steady flow with low variation, and provides fast access for nozzle change and cleaning to reduce downtime.

Problem

Assembly lines using heavy pastes often face inconsistent bead shape, nozzle clogging or frequent stops, which increase scrap and labor.

Cause

High‑viscosity materials need positive displacement metering and steady supply. Pressure‑based systems or narrow passages cause pulsation, air pockets and wear, leading to variable deposits and maintenance issues.

Solution

This concentric screw design pushes material forward by screw rotation so flow follows motor speed linearly. Multi‑channel heads share the same drive and feed arrangement to keep output matched across channels. Robust wetted parts, short fluid paths and quick‑release heads reduce deposit variation and make cleaning straightforward.

Application

• High‑viscosity adhesive dosing for power electronics and module bonding.
• Multi‑point dispensing on PCB arrays, connector pads and sensor modules.
• Thermal interface material start points for vapor chamber and heat spreader assembly.
• Automated production lines and robotic workcells requiring matched multi‑head output.

How It Works

The concentric screws rotate to displace material forward; screw speed directly controls delivered volume. Each channel draws from a shared feed and passes through a short path to its outlet. Because displacement is mechanical and positive, the system avoids pressure pulses common in pump systems. Matching nozzle size and screw speed gives target bead width and shot volume.

How To Choose

1. Select channel count (4/8/16) to match number of dispense points or simultaneous heads.
2. Provide fluid viscosity at working temperature and any solids content for final sizing.
3. Choose nozzle diameter to meet target droplet or bead dimensions for each channel.
4. Decide feed method (pressure pot for continuous runs; bulk feed for high volume).
5. Confirm motor driver and encoder compatibility for your robot or PLC interface.
6. Request a bench test if fluids are near upper viscosity range or contain abrasive fillers.
   
   

FAQ

Q1: Can one pump feed all channels without loss of performance?
A1: Yes. With correct feed plumbing and regulator, one supply can feed 4/8/16 channels; flow distribution depends on nozzle size and feed layout.

Q2: What nozzle sizes are recommended for high‑viscosity paste?
A2: Larger nozzle diameters reduce clogging for heavy pastes; typical sizes start at 0.30 mm and increase as viscosity and solids rise. We can advise based on your fluid.

Q3: How is repeatability ensured across channels?
A3: Repeatability comes from positive displacement screws, matched fluid paths and stable feed. Encoder feedback and flow sensors can further improve per‑channel verification.

Q4: Can it handle abrasive or filled adhesives?
A4: Yes — specify ceramic or coated wetted parts and plan spare parts. We recommend a bench wear test for abrasive materials.

Q5: Do you provide on‑site integration and tuning?
A5: Yes. Mingseal offers bench trials, parameter tuning and on‑site commissioning to transfer settings to production.

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