High Viscosity Eccentric Screw Valve 2.5–50 mL/min Flow Rate Supports up to 1,000,000 cps

Product Overview

The eccentric screw valve delivers steady metered flow from 2.5 to 50 mL per minute and is designed for very thick adhesives up to 1,000,000 cps. It uses positive displacement screws for uniform output, a short fluid path to reduce air entrapment, and a quick‑release head for fast cleaning. Choose this valve for production where high-viscosity pastes must be placed reliably with low maintenance and repeatable bead or dot shape.

Problem

Production lines using heavy pastes often face uneven beads, missed deposits, or frequent cleaning stops, which lower yield and increase labor.

Cause

Thick materials resist flow, and systems that rely on pressure or small clearances can stall, produce pulsation, or let air in. Incorrect nozzle choice and unstable feed cause inconsistent deposit volume and shape.

Solution 

This eccentric screw valve meters material directly by screw displacement, avoiding pressure‑driven instability. With selectable nozzle options and robust wetted materials, the valve maintains consistent output and reduces nozzle blockages. The quick‑release mixer and easy access to screws minimize downtime for cleaning or part replacement.

Application

• Structural bonding in electronics: dispensing thick adhesives for power modules and large pads.
• Thermal interface assembly: controlled paste placement for vapor chambers and heat spreaders.
• Motor and actuator assembly: gap filling and thick bead application.
• Industrial sealing: wider bead or heavy sealant application in enclosure assembly.
• Pilot lines and small-series production where high-viscosity handling is required.

How It Works 

The rotating eccentric screws create positive displacement and push material forward at a set rate. Screw speed directly controls flow, so output is proportional to motor RPM. Material moves through a short, straight channel to the mixer and outlet, which reduces air pockets and keeps shot volumes consistent. Nozzle diameter and motor speed set shot size and bead width.

How To Choose

• Determine required flow (mL/min) and pick a model covering peak demand with margin.
• Provide paste viscosity at operating temperature and solids content to size screws and choose wetted materials.
• Select nozzle diameter based on target dot or bead size.
• Choose feed method (pressure pot, bulk, cartridge) that keeps reservoir supply steady.
• Consider static vs dynamic mixer depending on cure and pot life.
• Request a bench trial for abrasive or very heavy fillers to confirm wear and settings.

FAQ 

Q1: Can this valve handle abrasive or filled pastes?
A1: Yes. Specify ceramic or coated screws and PTFE inserts for abrasive fillers; we recommend a bench test to confirm wear rates.

Q2: What is needed to control flow precisely?
A2: A stable feed supply, a motor controller with steady speed, and proper nozzle selection. Optional encoder feedback or a flow sensor improves verification.

Q3: How often should the head be cleaned?
A3: Cleaning interval depends on material and duty cycle. The quick‑release head makes short cleaning breaks possible; frequent runs with filled pastes need more frequent checks.

Q4: Can the valve feed multiple dispense heads?
A4: Yes. With proper mixing and supply layout, the pump can feed downstream dispensers or split lines; consult our engineering team for layout and pressure drop checks.

Q5: Do you offer sample testing?
A5: Yes. Send paste samples and working temperature; we will run bench tests and return results with recommended settings.