What causes pneumatic injection valve adhesion?

Main reasons for pneumatic nozzle clogging:

1. Improper air pressure setting

Air pressure is pneumatic nozzle one of the key factors driving its operation. When the driving air pressure is too low, the force of the compressed gas acting on the lower surface of the piston is insufficient to allow the piston to overcome the spring force and lift completely. The speed at which the impactor moves downward may be less than the critical injection speed, resulting in incomplete atomization and ejection of the fluid, which instead flows out of the nozzle and accumulates at the outlet, eventually causing clogging. Conversely, when the driving air pressure is too high, although the impactor stroke and injection speed will increase, the excessive impact force may cause uneven dispersion of the fluid during injection, producing satellite droplets, which is also a form of clogging. Therefore, reasonably setting the air pressure is key to preventing clogging.

2. Nozzle misalignment

Nozzle alignment is pneumatic nozzle crucial to the injection effect. If the nozzle is not adjusted to the optimal position during alignment, it may cause the fluid to deviate from the predetermined trajectory during injection, failing to accurately reach the target position, and accumulating around the nozzle, causing clogging. In addition, improper alignment may also cause poor sealing between the nozzle and the valve seat, causing fluid leakage during injection, further exacerbating clogging.

3. Nozzle contamination

Nozzles are easily contaminated by dust, oil, and other pollutants during use. These contaminants not only affect the injection effect of the nozzle but may also cause nozzle blockage or wear, preventing the fluid from being completely ejected during injection, thus forming clogging. Therefore, regular cleaning of the nozzle is one of the important measures to prevent clogging.

4. Influence of fluid properties

The viscosity, surface tension, and other properties of the fluid also affect the injection effect of the pneumatic injection valve. When the fluid viscosity is too high or the surface tension is too large, the fluid may not be easily dispersed during injection and is easily accumulated around the nozzle, forming clogging. In addition, some fluids may undergo chemical reactions or phase changes under specific conditions, causing changes in fluid properties, which in turn cause clogging.

Measures to prevent clogging of the pneumatic injection valve:

1. Reasonable air pressure setting

According to pneumatic nozzle the model and fluid properties, reasonably setting the air pressure is crucial for preventing clogging. In actual operation, the optimal air pressure range can be determined through experiments and observations to ensure that the fluid can be completely atomized and ejected, avoiding clogging.

2. Regular nozzle calibration

Regularly calibrate the nozzle to ensure that it is in the optimal position and that the seal between the nozzle and the valve seat is good. During calibration, strictly follow the operating procedures to avoid clogging caused by improper calibration.

3. Regular nozzle cleaning

Regularly clean the nozzle to remove contaminants and residues and keep the nozzle clean and unobstructed. During cleaning, use appropriate cleaning agents and tools to avoid damaging the nozzle.

4. Select appropriate fluids

Select suitable fluids based on production needs and avoid using fluids with high viscosity or high surface tension. If necessary, methods such as adding diluents or surfactants can improve fluid properties and enhance the injection effect.