SNP introduces plastic alternative to metal eductor nozzles

The Spray Nozzle People (SNP), a standard and custom-designed spraying solutions provider, has introduced a new range of PVDF (Kynar) eductor nozzles.

Storing liquids in tanks is essential for many process industry applications, as is the need to agitate the contents to avoid separation and sedimentation.

Fluids can be recirculated through tanks to achieve separation, which helps to optimise chemical action in dip tanks, although the process can be enhanced by the introduction of eductor nozzles.    

For many applications eductor nozzles made from brass or stainless steel (as opposed to plastics such as polypropylene) will be the preferred choice, especially if the chemicals are aggressive, or are stored at higher temperatures.

A more economical alternative to these more expensive nozzle materials is PVDF (Kynar), a chemically resistant fluoroplastic with superior heat resistance compared to many other plastics.

Eductors are submerged inside the tank and the motive liquid is pumped under pressure though the discharge orifice.

The jet of liquid enters the venturi section, entraining additional liquid from the tank and moving it through the venturi.

A discharge plume of combined motive and entrained liquid exits the venturi and continues the mixing and agitating action for a substantial distance effectively multiplying the liquid flow.

Depending on the model and the operating pressure, the volume of liquid discharged from the eductor will be up to four or five times greater than the volume of motive liquid being pumped, which reduces energy use and therefore cuts costs.

Eductors can be used effectively wherever chemicals are being stored inside closed tanks yet need to be agitated.

Eductors are commonly used in tanks used for sludge, pulp, slurries, chemicals, plating, electrocoating and pre-treatment, phosphating, paint, anodising, and agricultural fertilisers.