March 15, 2022

Points for judging that the nozzle needs to be replaced

Due to the small design shapes of nozzles, fan nozzles, atomizing nozzles, two-fluid air atomizing nozzles, spiral nozzles, metal nozzles, humidifying nozzles, etc., various nozzle models are easily blocked by dirt residues during long-term use in production, and can not be normal. After using the nozzle for a period of time, different shapes will appear. Through these shapes, our technicians have come to the following conclusions in various ways, and then we can clearly see whether the nozzle is in ideal use condition or not. Whether it needs to be replaced, cleaned, maintained, repaired, etc.

12 standard reasons for nozzle replacement

1. Use the pressure gauge of the pump from the nozzle to observe whether there is a pressure drop or increase in the pressure gauge of the pump. The drop of the pressure gauge of the nozzle means that the nozzle mouth is severely worn and the water volume becomes larger. A rise in the pressure gauge of the nozzle means that the nozzle orifice is blocked.
2. Whether the spray shape of the nozzle has changed, such as uneven spraying, obvious streaks, and inability to spray, indicating that the nozzle mouth is damaged.
3. From the appearance of the nozzle, whether the nozzle body occurs: external deformation, wear, corrosion, blockage, meltdown, sticking scale and other phenomena, indicating that the nozzle needs to be replaced due to the influence of the external environment.
4. The nozzle cannot achieve the required spray effect, such as the angle becomes larger and the impact force becomes less.
5. Put the nozzle on the special test machine for actual measurement, and then compare it with the new product or data to see if it is significantly different from the new product.
6. The material on the surface of the nozzle nozzle and the inner flow channel gradually becomes larger or deformed, which in turn affects the flow rate, pressure and spray shape.
7. The chemical action of the spray liquid or the environment causes corrosion and damages the nozzle material.
8. Dirt or other impurities in the liquid block the mouth of the nozzle, thus limiting the flow of the nozzle and disturbing the spray shape and its uniformity.
9. The spray, mist or chemical accumulation on the material inside or outside the edge of the nozzle mouth caused by the evaporation of the liquid can leave a dry solidified layer and block the nozzle mouth or inner flow channel.
10. Overheating will have a certain damage effect on the nozzle material designed for non-high temperature use.
11. During installation and cleaning, the nozzle may be accidentally damaged due to the use of incorrect tools.
12. Washers that deviate from the axis, over-tightening or other problems that change their position can have adverse effects.

The use of nozzle precautions

1. Flow and pressure, spray angle and coverage are proportional. The purpose of spraying any nozzle is to maintain continuous contact of the bath fluid with the workpiece, and flow is a more important factor than pressure.
2. The temperature of the liquid does not affect the spray performance of the nozzle, but it affects the viscosity and specific gravity, and also affects the selection of materials. The material of the nozzle should also be determined according to the chemical characteristics of the bath fluid. For non-corrosive bath fluid, bronze casting or plastic die casting can be used according to the difficulty of processing.
3. In order to prevent corrosion, non-metallic materials can be used; for strongly corrosive baths such as sulfuric acid and hydrochloric acid, nylon plastics can be used; the nozzle material used for phosphating baths is generally acid-resistant stainless steel, and the nozzles to prevent corrosion can also be directly selected Made of stainless steel or nylon.


The above manifestations indicate some basic special needles of the nozzle after a period of use. Through these nozzles with special needles, we can clearly see whether the nozzle has reached the ideal state, whether the nozzle needs maintenance, regular inspection, cleaning or even replacement. , in order to guarantee the quality of the final product and maintain the economics of the production process.

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