THE SPRAY NOZZLE
The spray nozzle transforms the energy of a liquid into kinetic energy.
The kinetic energy is utilized to break up the liquid into small particles, and
to disperse them evenly according to the desired pattern.
In some cases the kinetic energy is used to increase the penetration force of the jet.
The nozzle also makes it possible to obtain pre-set capacities according to the pressure
applied as can be seen from the tables in this catalogue.
The capacity depends on the internal flow area and on the working pressure.
In general the relationship between the capacity and the pressure is the following:
Q1 and P1 are known capacity and pressure. Q2 is the resulting capacity at desired
pressure P2. All the tables of the catalog are based on water. For liquid with a specific
gravity other than 1 multiply the catalog water capacity by the following conversion:
Type of nozzle
It is available a wide range of nozzles suitable to solve every kind of your
spray problems. So you can choose different spray patterns, and precisely:
Hollow cone spray: type A
The liquid particles are distributed evenly forming the outer shell of a hollow
cone. The area covered by the spray, falling perpendicularly to the jet, is in this
case a circumference whose diameter is relative to the distance of the nozzle and
the spray angle.
Full cone spray: type B
In this type of spray the internal part of the cone is also filled evenly
with liquid particles. The area covered by the spray,falling perpendicularly
to the jet, is in this case a circle whose diameter is relative to the distance
of the nozzle and the spray angle.
Flat jet: type C
In this type the area covered by the spray falling perpendicularly in an elongate
elliptical shape. The dimension of the lateral axis is relative to the distance
between the nozzle and the covered area. The dimension of the longitudinal axis
is relative both to the distance from the nozzle and the spray angle.
Atomizing nozzle: type E
In these nozzles the compressed air is mixed with the liquid to provide a
fine atomization. From the tables you can choose the type of atomizer which better
satisfies your specific requirements.
The spray angle is usually measured near the orifice.
Increasing the spray distance the measure of the spray width becomes less exact because
of gravity effect and ambient conditions. It must be considered that an increase of
the viscosity of the products to spray reduces the spray angle. The table lists the
theoretical coverage at various distances in relation with the spray angle.
Droplet size (atomization)
The major factors affecting droplet size are the capacity, the pressure and the
Usually an increase of the capacity, under the same conditions of pressure, produces
larger droplet size.
The increase of the pressure reduces the droplet size, as well as the increase of the spray
angle. Air atomizing nozzles produce the smallest droplet size, full cone nozzles produce
the largest droplet size.
For every spray pattern, the table shows the average droplet sizes relative to the minimum
and maximum capacity values, with a pressure of 3 bar.
The spray impact depends on capacity, pressure and spray pattern. The highest
impact is produced by solid stream and flat spray, the lowest one by wide
full and hollow cone.
The wear effect produced on the nozzle orifice determines an increase of capacity.
Under the same conditions, stainless steel life is five times longer than brass.
Classification of spray measures
The standard material of our product is indicated on the table 1.
Eurospray may also supply the nozzles even with non-standard material according to the customer’s request.
EUROSPRAY’s products are identified by 11 alphanumeric characters.
SPRAY NOZZLES identification method
- the first character is a letter that identifies the material (see table 1)
- the second character is a number that identifies the thread (1/8”-1/4”- 3/8”
etc. see table 2)
- the third character is a letter that identifies if the thread is male (M) or female (F),
where it isn’t specified the thread doesn’t exist (i.e. for DH – BG model) in
that case don’t refer to table 2
- the fourth and the fifth characters identify the nozzle type described
on “nozzle catalogue” ( for example C2 flat spray)
- the sixth end the seventh characters are numerics and correspond to the
capacity according to the “nozzle catalogue” (for example C2-03 MODEL 03 stand for
capacity 1,20 lt. at 3 bar) in MC3E model the capacity is indicated by the seventh
and eighth character (see table 3)
- the eighth and nineth characters identify the spray angles according to the
“nozzle catalogue” (see table 4)