Common problems with the use of dispensing valves

The dispensing valve is one of the indispensable spare parts in the operation of the automatic dispensing machine. How to solve the problems encountered by the dispensing valve during the entire process of the automatic dispensing machine? JEENOCE has summarized the following points for you:

1. The dispensing valve cannot stop dispensing

① Rubber dispensing valve transfer station pole or sealing equipment worn out

② The dispensing valve cannot be opened with standard air pressure

2. Glue dispensing valve needle dripping

Leakage of the glue valve in the dispensing machine often occurs after the glue valve is closed. 95% of such cases are caused by the small size of the needle used in the application. A very small needle can harm the fluidity of the liquid and cause condensation, resulting in leakage shortly after the rubber valve is closed. A too small needle can also harm the position of the exhaust bubble when the rubber valve is gradually applied. If a large needle is replaced, this type of problem can be solved. The conical side needle causes less condensation and smoother liquid flow. Gas inside the liquid can cause leakage after the rubber valve is closed.

3. The dispensing valve does not release glue

① Check if the strong adhesive in the rubber cylinder is sufficient

② Checked if the rubber hose was smooth

③ Check if the gluing equipment of the dispensing valve is smooth

④ Check if the dispensing valve has standard air pressure provided

⑤ Check if the calibration cartridge yellow is stuck

4. The water flow rate of the dispensing valve is very slow

If the rubber hose is too long or too narrow, the standard air pressure of the branch pipe is not enough, causing the water flow rate of the automatic dispensing machine to be too slow. Change the rubber hose route from 1/4 to 3/8, and minimize the number of pipes if not needed. In addition, it is necessary to improve the glue mouth and standard air pressure, so as to accelerate the water flow rate.

5. Bubbles in liquids

If the liquid pressure is too high and the valve opening time is too short, it is possible to penetrate gas into the liquid. The solution is to reduce the liquid pressure and apply a conical side needle.

6. Quick drying glue (instant glue) is blocked on the connection head and pipeline of the glue valve

The key reason for such situations is that there is too much internal moisture or repeatedly used quick drying adhesive. Fresh quick drying adhesive should be applied, and the pipeline should be cleaned with Aceton toluene that does not contain internal moisture. The applied gas should be clearly dry and the filtering device should be modified between the air pressure and the rubber valve system software in the factory.

7. Inconsistent adhesive size

The key to inconsistent dispensing is the unstable pressure of the pressure cylinder or gas used to store the liquid. The inlet pressure variable pressure gauge should be set 10 to 15 psi lower than the minimum pressure inside the factory. The pressure applied to the pressure cylinder should be close to the pressure above the middle of the variable pressure gauge, and the application pressure should be prevented from approaching the low pressure part of the pressure gauge. The operating pressure of the rubber valve should be at least 60psi to ensure smooth dispensing. The final adhesive time should be checked. If it is less than 15/1000 seconds, it will lead to unstable dispensing, and the longer the dispensing time, the smoother the dispensing.