In automated dispensing production, manufacturers commonly encounter issues such as inconsistent dispensing, stringing, valve clogging, adhesive corrosion, and insufficient dispensing accuracy. In most cases, these problems are not caused by equipment failure or improper operation, but by a mismatch between the dispensing valve and the adhesive properties.
The dispensing valve is the core dispensing component of an automated dispensing system, directly determining dispensing accuracy, stability, and production yield. Since different adhesives vary significantly in viscosity, stringing behavior, corrosiveness, filler content, and curing characteristics, they require completely different valve structures, wetted materials, and dispensing methods.
All dispensing valves from Second Intelligent are independently designed and developed in-house. Leveraging years of expertise in precision fluid control technology, each valve is optimized for specific adhesive characteristics, helping eliminate common dispensing issues caused by improper valve selection and ensuring stable, high-volume production across a wide range of industries.
This guide focuses on the key properties of adhesives and introduces the application scenarios, advantages, and selection considerations of Second Intelligent’s six major dispensing valve series, providing a practical and standardized valve selection reference.
I. Core Selection Principle: Choose the Valve Based on Adhesive Properties
Many users prioritize dispensing accuracy, price, or brand when selecting a dispensing valve. However, the first and most important criterion is compatibility between the valve and the adhesive.
1. Adhesive Viscosity: Determines Dispensing Force and Valve Structure
Viscosity is the most fundamental physical property of an adhesive and directly determines the dispensing mechanism and flow channel design.
2. Stringing and Flow Characteristics: The Key to Preventing Tailing and Overflow
Silicone, epoxy, and hot melt adhesives naturally exhibit stringing characteristics. Conventional valves may leave adhesive strings after closing, resulting in tailing, uneven bead width, adhesive overflow, and contamination of the workpiece.
3. Chemical Activity and Curing Characteristics: Determine Valve Type, Materials, and Mixing System
The chemical activity, curing speed, and whether an adhesive is single-component or two-component are often overlooked during valve selection
The following selection guidelines are recommended:
● Low-viscosity fluids: Choose a diaphragm valve; for highly reactive fast-curing adhesives, select chemically inert wetted materials.
● Medium-viscosity, stringing adhesives: Choose a suck-back needle valve or piston valve.
● High-viscosity adhesives: Select a needle valve or screw valve according to dispensing accuracy requirements.
● Particle-filled adhesives: Use a wear-resistant screw valve or a large-orifice dispensing valve.
● Two-component adhesives: Employ a complete two-component meter mix dispensing machine, mixing, and dispensing system rather than a single dispensing valve.
● High-speed micro dispensing: Use a piezo jet valve.
● Large-area coating: Use a spray valve.
Successful dispensing valve selection is determined not by price or specifications, but by the precise match between adhesive properties, valve structure, wetted materials, and dispensing process.
With its complete portfolio of independently developed dispensing valves , Second Intelligent provides optimized solutions for a wide range of adhesives, production environments, and dispensing applications, effectively solving common manufacturing challenges such as inconsistent dispensing, stringing, valve clogging, corrosion, and dispensing inaccuracies while improving production yield and reducing maintenance and rework costs across diverse industries.
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