SYSTEM INFORMATION 11
NOZZLES: The spray nozzle is a precisely machined
orifice made of hardened stainless steel. The
orifice size is matched to the output of your
machine to attain the proper flow and pressure
that your machine was designed for. The orifice or
hole of the nozzle will begin to get larger as the nozzle
becomes worn. For optimum performance, replace the
spray nozzle to maintain the full output pressure of your
machine. The nozzle installed in your machine from the
factory is designed to allow only about 90% of the water
being pumped to discharge out of the nozzle. The remain-
ing 10% is bypassed back into the inlet water supply by the
unloader/regulator valve. If an incorrect nozzle size is used
the maximum flow and pressure of the machine cannot be
achieved and the pressure unloader valve can wear prema-
turely. When replacing the nozzle match to one size under
the flow and pressure output of the pump.
The nozzle is usually connected to the wand with a quick
coupler. Be sure the collar on the quick coupler snaps
back to the locked position, or the nozzle could be lost
when the trigger on the spray gun is squeezed. Never
connect the spray nozzle directly to the trigger gun without
a wand or injury could result. Never place hands or fingers
over the nozzle tip.
The nozzles generally come in three different spray
angles, 0º, 15º, and 40º. The different spray angles of a
given size of nozzle do not change the output pressure of the
machine, just the impact force and surface coverage of the
water spray. The 0º nozzle sprays a straight stream which
impacts the surface very hard but does not cover a very
wide area. Use the 0º nozzle with care because it can
damage the surface you are spraying with its high impact
and long reaching spray.
The 15º nozzle sprays out a flat stream at a 15º width. It
gives you less impact power but covers a wider area with
one pass of the spray wand. As you back away the
spraying nozzle from the surface, the spray impact will
decrease.
The 40º nozzle spreads the water stream over an even
wider area to give you less impact for delicate surfaces.
Some machines come with one 15º nozzle which covers
most cleaning applications. Additional nozzles can be
added and fitted with quick couplers so that the nozzles can
be interchanged for various applications.
The steam nozzle sprays less water than the other high
pressure nozzles, so the water is discharged at a higher
temperature. (Up to 250º F).
