Spiral Nozzles

Spiral Full Cone (Deflection Nozzle)

This is not properly a full cone, but rather a continuous liquid curtain evolving with the shape of a spiral inside a conical volume. The disadvantage of a scarcely even distribution is compensated by an exceptionally good resistance to plugging, which makes this nozzle the best choice in those applications where safety or system reliability are the prime concern, e.g. fire fighting systems.

Multiple Full Cone (Turbulence Nozzle, Air Atomiser)

This spray pattern is used in two cases, that is:

A. When a wide spray angle is to be reached with nozzles which inherently can only 
produce a narrow one, or in such cases where small size droplets and rather high capacities are required. Therefore several nozzles are grouped in a cluster with different spray directions:  the resulting spray pattern occurs from the additional group of single nozzle sprays and the droplet size of the spray remains the same as one of single nozzle. It must be noted that a smaller nozzle will normally make smaller drops as compared to a larger size nozzle of the same type operating under the same conditions.

B.When it is necessary to obtain a wide angle jet using nozzles which inherently deliver a limited angle spray. In the case of a wide angle air atomiser, for example, the droplet distribution is obviously not homogeneous and the result is rather a number of small angle sprays with different directions, but still the liquid is atomized towards all the parts of the volume to be treated.

Spiral Nozzles

Spiral nozzles work on the impact principle, by deflection of a water stream onto a spiral profiled surface which provides the desired spray angle.
The spray angle value is maintained even at low pressure and when spraying high viscosity liquids. While the droplet spray distribution is not comparable to the one provided by a standard full cone nozzle, the fact that a whirling vane is not required makes them virtually clog-free in most cases. Since spiral nozzles work on the impact principle and have no inherent turbulence losses, they produce faster and smaller droplets as compared to a standard full cone nozzle. Capacity values on a grey background should be obtained with metal nozzles only, plastic materials being too weak to assure structural nozzle resistance.
See next page for materials, applications and assembly fittings.

Materials B31 AISI 316L Stainless steel T1 Brass
The two above materials are usually available in stock, while several other materials as listed on page 25 can be obtained on request. Spiral nozzles can be delivered in brass and all the plastic materials in the following list. Most types are also available from stock or with short delivery in cast 316 stainless steel. Please contact our sales offices for delivery time in a given material.

Materials
B31 AISI 316L Stainless steel D1 PVC D2 Polypropylene D8 PVDF E1 PTFE
L8 Hastelloy C 276 T1 Brass

Spiral Nozzles / Wide Passage

E-X type nozzles feature the same design and advantages as the E-type nozzles, while the resistance to clogging is enhanced by a longer spiral pitch. The spiral pitch length is typically equal to the inlet orifice diameter, therefore any foreign particle entering the nozzle can also find a way out through the spiral opening. Material list at the bottom of previous page.

Coding
Extra wide passage spiral nozzles are often supplied in a special design, where the nozzle has no thread and it is assembled onto a nipple by means of a retaining nut. This design is the only one possible with Silicon Carbide nozzles, while it can be obtained as an option for nozzles cast in special alloys or stainless steel. To identify such nozzles please note the following coding EHW 3747 xx Xy
xx = Material code,   see material table on the previous page
y = Connection code / B=Bspt male thread / N=NPT male thread / F= Locknut fitting

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