Common problems and simple solutions for dispensing machine valves

Rubber valve leakage?

Reason: The needle is too small, causing poor liquid flow or too many bubbles in the glue.

Solution: Replace the needle with a larger one (recommended conical angled needle to reduce resistance); Use a centrifuge to remove bubbles from the glue, or buy low bubble glue directly.

Inconsistent adhesive size?

Reason: The pressure tank or gas source is unstable, and the glue dispensing time is too short.

Solution: Set the pressure gauge 10-20 PSI lower than the lowest pressure in the factory to avoid using low-pressure areas; The pressure of the glue valve should be at least 60 PSI to extend the glue dispensing time.

Slow flow rate?

Reason: The pipe is too long or too thin, or the design of the glue outlet is unreasonable.

Solution: Use 3/8-inch thick pipes to shorten the length of the pipes; Expand the rubber outlet and increase the air pressure by 10% -15%.

There are bubbles in the glue?

Reason: The pressure is too high but the valve opening time is short, causing air to mix into the glue.

Solution: Reduce pressure and replace the conical angled needle to assist in exhaust.

Instant glue blockage?

Reason: Moisture entering or old adhesive residue.

Solution: Clean the pipeline with new glue and anhydrous acetone; Install an air filter (use nitrogen if it's not working).

UV glue curing problem?

Reason: Ultraviolet radiation causes bubbles to form in the old adhesive, which affects the dispensing process.

Solution: Replace the black tube to avoid light; Empty the old glue and pour new glue into the pressure tank.

Needle dripping or dripping?

Reason: Small needles are prone to air ingress, and flexible materials are prone to deformation.

Solution: Use large metal needles or conical angled needles; Do not use soft materials such as Teflon.

Leakage of sealing ring adhesive?

Reason: The sealing ring is aging, worn, or installed incorrectly, causing glue to seep out.

Solution: Stop the machine and check the sealing ring. If it is worn, replace it with a new one; Align the position during installation to ensure there are no gaps.

Residual epoxy resin?

Solution: Clean the pressure tank and pipelines with toluene at the end of each shift. The more frequent the cleaning, the better the effect.

Summary of Optimization Points

Needle selection: conical oblique type: reduces back pressure and makes liquid flow smoother.

Stable pressure above 60 PSI: Avoid low-pressure areas and extend the dispensing time.

Adhesive treatment: centrifugal defoaming, UV glue avoiding light, regular cleaning of pipelines.

Key to anti blocking: Do not use old glue, add a dry filter to the trachea.

Pipeline upgrade: Coarse pipe (3/8 inch) with short length, significantly speeding up.