Working Principle of FC100 MC Matching High Precision Dispensing Valve

FC100 MC Precision Needle Dispensing Valve: Complete Working Principle Explained

I. Basic Structure Breakdown (Corresponding to Valve Body in the Diagram)

Fluid Inlet (Top Quick-Connect Connector): Connects to the glue cartridge/pressure tank, conveying fluids such as glue, ink, solder paste, and UV adhesive;
Pneumatic Drive Cylinder (Red Main Body): Dual air path interface (two quick-connect air hoses), built-in piston and spring;
Micrometer Fine-tuning Scale Rod (Bottom Metal Scale Knob): Precisely limits the downward stroke of the ejector needle, controlling the dispensing flow;
Sealed Valve Chamber + Ejector Needle Sealing Assembly: Valve needle, polyurethane/Teflon sealing ring, leak-proof gasket (as shown in the matching bag accessories);
Dispensing Nozzle Interface: Replaceable with various colored plastic and stainless steel dispensing needles shown in the diagram.

II. Complete Pneumatic Workflow (Two-Position Three-Way Pneumatic Control Logic)

1. Closed State (Normally Closed, Standby)
Air is introduced through the lower pneumatic port, and the air pressure pushes the piston inside the cylinder downwards;
The piston, in conjunction with the valve needle push rod, presses down to tighten the sealing seat inside the valve nozzle;
The metal valve needle completely blocks the fluid outlet channel, preventing glue from flowing out and achieving zero leakage;
The bottom micrometer knob presses against the lower limit of the push rod, locking the maximum downward stroke and preventing excessive wear on the sealing seat.

2. Dispensing Open State (Dispensing Operation): Air enters through the upper pneumatic inlet and exits through the lower inlet. The upward air pressure pushes the piston, compressing the built-in return spring.

The piston lifts the valve needle upward, creating an annular fluid gap between the valve needle and the sealing seat.

The upstream pressure tank continuously applies constant pressure to the fluid, causing the adhesive to flow through the gap, through the valve nozzle, and out of the dispensing needle.

Flow control core: A micrometer-scale knob limits the maximum height the valve needle can lift. The scale value directly corresponds to the gap size; a larger scale number indicates a higher valve needle lift and a larger dispensing volume. Micrometer-level fine-tuning ensures uniform dispensing volume for each drop.

3. Reset and Dispensing Cut-off (Single Dispensing End): Air is cut off in the upper air path and re-enters in the lower air path.

The combined force of air pressure and the built-in return spring pushes the piston and valve needle downward rapidly, sealing the flow path.

Instantly cuts off the fluid, resulting in a clean, crisp dispensing cut-off without stringing or trailing, suitable for precision electronic micro-dispensing needs.

III. Core Sealing and Leak-Prevention Principle (Function of Matching Gaskets and Spare Parts)
* **Multi-layer O-ring seals and wear-resistant gaskets built into the valve cavity:**
* **Cylinder and fluid cavity isolation seal:** Prevents adhesive from flowing upwards into the pneumatic cylinder, avoiding piston jamming.
* **Valve needle dynamic seal:** Teflon gasket adheres to the reciprocating valve stem, preventing leakage even with long-term use of high-viscosity or solvent-based adhesives.
* **Valve nozzle end face sealing gasket:** Provides a buffer seal when replacing the needle, preventing adhesive overflow at the interface.
* **Matching bagged sealing rings and wear-resistant plugs are replacement consumables, extending the valve body’s service life.**

IV. Compatibility and Collaboration Principles with the FC100 MC Model

The FC100 MC dispensing controller outputs two independent timing air pressure signals, precisely controlling the airflow sequence in the upper and lower air paths of the valve body.

The controller adjusts the air pressure, working in conjunction with the valve body’s micrometer mechanical fine-tuning, providing dual control over the dispensing volume.

The controller outputs a switch signal to synchronously trigger the valve’s opening and closing, and when paired with different inner diameter colored dispensing needles (consumables shown in the image), it allows switching between fine-diameter micro-dispensing and wide-diameter high-flow-rate dispensing.

V. Applicable Fluids and Operating Conditions Adaptation Logic

Low viscosity fluids (UV adhesives, thinning inks): Reduced micrometer stroke + fine needle, low air pressure dispensing;
Medium-high viscosity fluids (red adhesives, silver adhesives, solder paste): Increased valve needle lifting stroke, thicker needle, increased dispensing pressure;
Instantaneous dispensing interruption structure: Suitable for high-precision micro-dispensing of PCB components, camera modules, electronic chips, etc., preventing adhesive overflow and product contamination.

VI. Summary of Core Advantages and Principles
* **Pneumatic Double-Action Drive:** Spring + air pressure bidirectional reset, opening and closing response speed <0.01s, no tailing in high-speed production lines;
* **Micrometer Mechanical Measurement:** Purely mechanical limit, unaffected by air pressure fluctuations, dispensing consistency far superior to ordinary simple valves;
* **Separate Fluid/Pneumatic Chamber:** Adhesive does not contact the cylinder piston, less prone to valve clogging, easy to disassemble, clean, and maintain;
* **Standardized Threaded Dispensing Port:** Universal for various plastic base stainless steel dispensing needles, strong consumable versatility.

• FC100 MC compatible precision thimble dispensing valve
• Pneumatic micro metering glue dispensing valve with micrometer adjustment
• Anti-drip high speed industrial glue valve for electronic PCB
• Industrial fluid dispensing equipment with spare sealing gaskets & dispensing needles