Concentric Screw Valve — 10–500 RPM, 98% Repeatability, 5,000–500,000 cps Viscosity

Product Overview

This concentric screw valve meters high‑viscosity materials using a robust screw drive that runs from 10 to 500 rpm. It supports a wide viscosity range and delivers steady, repeatable output with typical repeatability around 98% after tuning. The valve features a short fluid path, quick‑release head and replaceable wetted parts to minimize downtime and simplify maintenance.

Problem 

Many production lines struggle with inconsistent bead shape or variable deposit volume when using pumps not matched to heavy pastes.

Cause 

Thick materials require positive displacement and steady feed. Systems relying on pressure swings or narrow clearances are prone to pulsation, air ingress and nozzle blockages that change deposits over time.

Solution 

This concentric screw valve provides positive displacement metering with direct screw control so flow follows rpm linearly. The short flow path and sturdy wetted parts reduce air pockets and wear. Nozzle options and quick access head make it straightforward to tune and to clean when needed.

Application

• Gap filling and structural adhesive dots for power modules and large PCBs.
• Thermal interface material placement for vapor chambers and heat spreaders.
• Sealant and bead application in small housings and connectors.
• Dispensing filled pastes and greases in manufacturing cells.

How It Works

The concentric screw rotates to push material forward at a controlled rate. Screw rpm sets flow; higher rpm increases output. Because the material is moved by positive displacement, the valve avoids pressure-driven pulses and keeps shot volume steady. Nozzle diameter and rpm together determine shot size and bead width. For abrasive pastes, choose ceramic or coated parts.

How To Choose

• Provide your fluid viscosity at operating temperature so we can confirm screw size and clearances.
• Decide required flow and peak demand per head; pick a model that covers peak with margin.
• Select nozzle diameter to match target dot or bead dimensions.
• Choose inlet feed method (pressure pot for long runs; gravity pot for short runs).
• If material is abrasive or filled, request ceramic/coat options and plan spare parts.
• Ask for a bench trial to set rpm, nozzle and inlet pressure for stable repeatability.

FAQ 

Q1: What does 98% repeatability mean in practice?
A1: It means shot volumes are consistent across a run after tuning; results depend on steady feed, correct nozzle and tuned rpm.

Q2: Can the valve handle abrasive pastes?
A2: Yes. Use ceramic or coated wetted parts and schedule more frequent inspections; we recommend a bench test.

Q3: How do I control flow precisely?
A3: Use the motor speed controller and optional encoder feedback. Flow scales linearly with rpm once tuned for your fluid.

Q4: What cleaning is required?
A4: The quick‑release head allows fast disassembly for cleaning. Frequency depends on material; keep spare mixer and nozzle parts for fast swaps.

Q5: Do you offer sample testing?
A5: Yes. Send fluid samples and operating temperature; we run tests, log results and recommend settings.