4

www.pnr-nozzles manufacturer.com

SPRAY PATTERNSFLAT JET SPRAY PATTERN

In a flat jet spray the liquid droplets are sprayed in the shape of a flat liquid layer, with differentthickness according to the principle used to generate the spray. A flat jet spray nozzle servesthe purpose of spraying onto a surface or an object moving in a transverse direction withrespect to the one of the jet surface, a typical example being the nozzles in a car washing tunnel. The vast majority of flat spray nozzles used in the industry work according to one of the following principles. IN LINE FLAT JET (PRESSURE NOZZLE) IN LINE STRAIGHT JET (PRESSURE NOZZLE) This is the general purpose flat jet nozzle, where the liquid enters the nozzle in line with the axis length and is fed to a pressure chamber, from where it is ejected through the nozzle orifice. Flow value and spray angle are determined respectively from the orifice cross section and the orifice edge profile. These nozzles can be considered a special kind of flat jet nozzle, with naught degree spray angle. They are designed to produce a sharp stable stream, with powerful impact on a given point, and serve normally to perform cleaning processes or to cut soft materials. SPOON FLAT JET (DEFLECTION NOZZLE) In this type of nozzle the liquid is fed under pressure to a round outlet orifice, and then deflected onto a smooth profiled surface so as to assume a flat jet shape. This sophisticateddesign is of advantage since it offers a stronger jet impact using the same feed pressure.Higher efficiency comes from the very little energy required to just change the direction of the liquid flow, this being the only energy required to generate the flat jet.A hollow cone spray pattern consists of droplets concentrated onto the outer surface of aconical shape volume, with no droplets contained in the inside of the conical jet shape. These nozzles are normally used for smoke washing or gas cooling applications in several industrial processes. HOLLOW CONE (TURBULENCE NOZZLE) HOLLOW CONE (DEFLECTION NOZZLE) These nozzles use a tangential injection of liquid into a whirling chamber to generate centrifugal forces which break up the liquid vein as soon as it leaves the orifice. Precisely designed orifice profiles, making use of the Coanda effect, provides the ability to obtain very large spray angles. A hollow cone can also be obtained taking a liquid flow to change direction onto a properly designed surface, in order to break the liquid into droplets and distributing them as a hollow cone spray pattern. This kind of nozzle is mainly used for applications in dust control and fire fighting systems.

HOLLOW CONE SPRAY PATTERN