CATALOGUE - AIR ASSISTED ATOMIZERS
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SPRAY NOZZLES FOR INDUSTRIAL APPLICATIONS

INTRODUCTION INDEX Air assisted atomizing and atomizer Properties of an atomized spray Ultrasonic atomizers Classic atomizers Atomizing set-ups and atomizer code Atomizing systems layout Body styles and atomizer options Pressure atomizers - internal mix Siphon atomizers Pressure atomizers - external mix Large size atomizers Special atomizers Hydraulic atomizers TECHNICAL PUBLICATIONS PNR manufactures a complete range of spray nozzles for industrial applications, as well as products and systems specially designed for specific industries. Information about our Company and our product range is...

INTRODUCTION AIR ASSISTED ATOMIZING Several industrial processes need the atomizing of liquids into fine and very fine droplets. This result might be achieved by means of a purely hydraulic nozzle, with the liquid being fed at high pressure through a very small orifice, but the process would originate two main problems: A Requiring costly investments and complicated lay-out. B Originating plugging problems because of the small orifice dimensions. In the majority of industrial processes a fine liquid atomization is obtained by means of air assisted atomizers, where compressed air supplies...

INTRODUCTION PROPERTIES OF A LIQUID SPRAY The atomization of a liquid by means of a compressible fluid, like air, steam or a gas, is defined two-phase or twin-fluid or pneumatic atomization. Many industrial processes require using finely atomized droplets and the techniques to produce finely atomized sprays have been largely improved in recent years with new types of atomizers being developed. In addition more sophisticated process techniques have increased the demand for a precise definition about the characteristics of a given spray for the purpose of getting precisely repeatable results....

ULTRASONIC ATOMIZERS Ultrasonic atomizers operate on a very sophisticated process which is based on two steps: In the first one tiny water jets are injected into an high speed air flow which provides a first break up and atomization of the fluid. In the second step the two phase flow, air entraining liquid droplets, goes trough a field of sound waves which produce a further break up and a lower droplet dimension. This is realized through an impact between the two phase flow and a resonator located in front of the nozzle orifice. Ultrasonic atomizers can only be manufactured with high...

ULTRASONIC ATOMIZERS ATOMIZERS AND FITTINGS Ultrasonic atomizers produce the finest sprays available with air assistance for industrial processes, with a narrow angle full cone jet. Water and air do not mix in a confined volume before leaving the nozzle and therefore their feed pressures can be adjusted independently without influencing each other: this allows for a very wide regulation range on the liquid capacity and makes it easier to reach the desired operating conditions. Please note that the code given in the table only refers to the atomizing head and must be completed with the...

ULTRASONIC ATOMIZERS NOTE

CLASSIC ATOMIZERS Classic atomizers are devices producing an atomized spray with the assistance of compressed air, where the liquid is broken into droplets when its outer surface is subjected to shear action from the high speed air flow. By assembling together a range of standard components in different materials, several different capacity values, spray patterns, spray angles and operation modes can be obtained. In addition, specific application problems can be addressed by the use of special accessories available on request. ATOMIZER SET-UP The set-up is the device where air and liquid...

CLASSIC ATOMIZERS SPRAY SET-UP A spray set-up is made out of a liquid nozzle and an air nozzle. When assembled the air nozzle fits precisely onto the liquid nozzle and the combination of the two provides the correct inside geometry to produce the spray. Such parameters of the two parts as the number, dimensions and profile of their inside passages determines all the characteristics of the atomized spray produced by that given set-up. A set-up can be selected according to the choices beside. The capacity tables in the following catalog pages show the specification of each individual set-up,...

CLASSIC ATOMIZERS ATOMIZER FEEDING An atomizer can work on two different liquid feed principles, that is • Liquid is supplied to the atomizer through a line under pressure • Liquid is aspirated by the atomizer from a container at ambient pressure. PRESSURE PRINCIPLE PRESSURE PRINCIPLE It is the most widely used, and therefore a large range of capacities and spray patterns are available. Liquid capacity, air capacity and droplet sizes can be adjusted by regulating air and liquid feed pressures and the two fluids are mixed inside the atomizer prior to be ejected (Internal mix atomizers). A...

CLASSIC ATOMIZERS BODY TIPES AND OPTIONS COMPLETE CODE To obtain the complete code for an atomizer it is necessary to use the set-up code you have choosen from the performance table and complete it with the code for body and options as follows: • Replace the first two letters in the set-up code (SU) with the code for standard body (MW). • Add the code for the material you require. • Add the code for the required options, if any, and the thread type code. CONNECTION G = BSP Female (EU) N = NPT Female (US) OPTIONS AISI 303 Stainless steel AISI 316L Stainless steel PVC LUCITE ® (PMMA) Nickel...

CLASSIC ATOMIZERS BODY TIPES AND OPTIONS 110 AA 1/4" AIR ACTUATED ATOMIZER MX bodies contain an air actuated cylinder which controls the spray operation by means of a needle, opening or closing the water inlet in the liquid nozzle. STANDARD SIZE MINI SIZE AA = atomizing air inlet (1/4” F) LI = liquid inlet (1/4” F) AC = cylinder air inlet (1/8” F) AA = atomizing air inlet (1/8” F) LI = liquid inlet (1/8” F) AC = cylinder air inlet (1/8” F) Normally the air used for atomizing the liquid flows continuously, while the air to the actuator is used to start and stop the atomizing cycles. For...