Why Can Gear Valves Achieve Continuous Variable Adhesive Dispensing?

As a high-precision fluid control device, gear metering valves are widely used in continuous dispensing processes for medium-to-high viscosity, single-component, non-abrasive fluids (such as sealants and potting compounds). Their core advantage lies in the ability to achieve high-speed, stable, and flexibly adjustable output, making them particularly suitable for complex trajectories and long-term uninterrupted production scenarios. So, how exactly do gear valves accomplish this precise control?

1. Working Principle: Gear Meshing and Volumetric Transport

The core structure of a gear valve consists of a pair of precisely meshed gears that rotate synchronously in opposite directions driven by a motor. As the gears turn, a series of sealed chambers are formed between the gear teeth and the valve body, drawing fluid from the inlet side and pushing it toward the outlet. Since the volume of fluid delivered per revolution of the gears is fixed, this structure operates as a positive displacement metering pump, ensuring high output stability unaffected by variations in fluid viscosity.

2. How Is “Continuous Variable Dispensing” Achieved?

• Precise Speed Control via Servo Motor
  Gear valves are typically equipped with servo motors featuring high-precision encoders, enabling real-time monitoring and adjustment of gear rotation speed. By increasing or decreasing the speed, the amount of adhesive dispensed per unit time can be adjusted continuously and steplessly.

• Smooth Fluid Transition Mechanism
  The gears maintain fluid chamber continuity even during engagement and disengagement, avoiding interruptions or pulsation and ensuring stable dispensing even during speed changes.

• Rotary Nozzle Enhances Path Adaptability
  Some gear valves integrate a rotary nozzle function, allowing flexible angle adjustments during dispensing to easily handle complex 2D/3D paths or curved surfaces, further expanding the process versatility of variable dispensing.

3. Key Structures Ensuring Performance and Reliability

• Pressure Monitoring and Release Device: Monitors internal pressure in real time and automatically relieves pressure in case of abnormal increases, preventing leakage or equipment damage.

• Lubrication Viewport: Allows easy observation of lubrication status, ensuring long-term stable operation of the gear pair.

• Sealed Structure and Material Compatibility: The valve body and gears are typically made of hardened steel or special alloys, offering wear resistance and compatibility with various fluids.

4. Conclusion

Gear valves achieve flexible, stable, and continuous controllable output at high speeds through the combination of volumetric transport principles and servo speed control systems. Their structural design balances precision and reliability, making them suitable for high-demand industrial applications involving non-abrasive fluids. With profound expertise in this field, HOLS is committed to providing customers with high-performance, reliable gear valve products and professional technical support.