The Precision Operation of Dispensing Valves: Unlocking the Mystery of Dispensing Syringe Fittings

Shown here are dispensing valve fittings that, notwithstanding their small size, play a vital role in the dispensing process, and have a subtle and complex principle of operation.

Pressure Drive Basics

The operation of a dispensing valve is usually based on a pressure drive system. When the dispensing equipment is started, an external pneumatic or hydraulic device applies pressure to the dispensing syringe, pushing the glue inside the syringe in the direction of the dispensing valve. It's like giving the glue a “power booster” that pushes the glue to move in the direction we expect.

Valve Control Core

The valve structure inside the dispensing valve is the core of achieving accurate dispensing. Common types of valves are thimble-type, diaphragm-type, and so on. Take the thimble type dispensing valve in the picture as an example, when there is no external force, the thimble relies on the elasticity of the spring to block the glue outlet tightly to prevent the glue from flowing out, just like a “gatekeeper” guarding the gate. When the dispensing equipment issued a command, through air pressure or electromagnetic force, etc. to promote the thimble to overcome the spring force upward movement, the glue outlet was opened, under the action of the pressure in the syringe, the glue will be squeezed out of the outlet, accurately dripping to the target location.

Precise control mechanism

In order to realize different dispensing requirements, the dispensing valve is also equipped with a precise control mechanism. On the one hand, the amount of glue extruded can be controlled by adjusting the amount of pressure applied externally. The higher the pressure, the more glue is extruded per unit of time; the lower the pressure, the less is extruded. On the other hand, by controlling the time of opening and closing the dispensing valve, the amount of glue and the frequency of dispensing can be precisely controlled. For example, in electronic chip packaging, the need for a very small and precise amount of glue, you can open the dispensing valve through a short period of time to accurately control the amount of dispensing, to ensure the quality of chip packaging.

These small dispensing valve accessories, by virtue of the subtle working principle, in electronics, automotive, medical and many other fields, to help realize the high precision, high quality dispensing operations, has become an indispensable key role in modern industrial production.