common problem
The most common problem encountered by the dispenser is the valve problem. The dripping of the valve often occurs after the valve is closed. 95% of this situation is due to the small diameter of the needle used.
A needle that is too small will affect the flow of liquid and cause back pressure, resulting in dripping shortly after the valve is closed. A needle that is too small will also affect the bubble discharge action of the valve when it starts to use. Just replace the larger needle to solve this problem. The tapered oblique needle produces the least back pressure and the liquid flow is the smoothest. The air in the liquid will leak after the glue valve is closed. It is best to remove the air in the liquid in advance, or use a glue that is not easy to contain bubbles. Or centrifuge the glue to degas before use.
Inconsistent glue size
When the glue is inconsistent, it is mainly caused by the pressure cylinder that stores the fluid or the unstable air pressure.
The inlet pressure regulator should be set at 10 to 15 psi. lower than the lowest pressure in the factory. The pressure used in the pressure cylinder should be above the middle of the regulator. Avoid using the low pressure part of the pressure gauge. .
The control pressure of the glue valve should be at least 60psi to ensure stable glue output.
Finally, check the glue time. If it is less than 15/1000 seconds, the glue will be unstable. The longer the glue time, the more stable the glue will be.
The flow rate is too slow
If the flow rate is too slow, change the pipeline from 1/4” to 3/8”.
The pipeline should be as short as possible if not necessary.
In addition to changing the tube, the glue port and air pressure must also be changed to speed up the flow rate completely.
Air bubbles in the fluid
If the fluid pressure is too large and the valve opening time is too short, air may leak into the liquid. The solution is to reduce the fluid pressure and use a tapered needle.

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