6
3.2 CONTROLS
(cont’d)
f) Nozzle
To select the correct nozzle size, determine the pressure (PSI) and flow (GPM) rating of your
pressure washer. This can be found on the manufacturer’s serial plate or literature.
Using the chart for nozzle requirements (see Figure 3 below) read across the top to the PSI of
your pressure washer then read down the column to the GPM of your pressure washer. The
correct orifice size is the number in the far left column. Most manufacturers will imprint an
identification code that will tell you the spray angle and the orifice size. For example, “25040”
means the nozzle has a spray angle of 25
°
and has a 4.0 size orifice.
F
C
A
B
D
E
APPROXIMATE GALLONS PER MINUTE (GPM)
Orifice
Size
800
PSI
1000
PSI
1200
PSI
1500
PSI
2000
PSI
2500
PSI
3000
PSI
3500
PSI
4000
PSI
3.0
1.4
1.5
1.6
1.8
2.1
2.4
2.6
2.7
2.8
4.0 1.8 2.0 2.2 2.5 2.8 3.1 3.5 3.8 4.0
4.5
2.0
2.2
2.4
2.8
3.0
3.6
3.9
4.3
4.5
5.0 2.2 2.5 2.8 3.1 3.6 4.0 4.4 4.7 5.0
6.0
2.7
3.0
3.3
3.7
4.2
4.7
5.2
5.6
6.0
7.0 3.1 3.5 3.9 4.3 4.6 5.5 6.1 6.5 7.0
Figure 3: Spray Gun Components and Nozzle Chart
Nozzle
Spray
Patterns
0
°
15
°
25
°
40
°
