3
3. OPERATION
3.1 HOW THE PRESSURE WASHER WORKS
The electric motor powers the plunger piston pump to pressurize the incoming water supplied by a standard
garden hose. The pressurized water flows through an operator controlled unloader valve to set the system
pressure. The unloader valve also allows the electric motor and pump to run under a no-load-condition when
the spray gun trigger is released. The pressurized water then goes past the injecting valve to add a liquid
chemical should it be desired. A spray gun wand is used to direct the fluid to the desired spot.
C
F
E
B
D
I
A
G
H
Figure 1: Pressure Washer Components
A Motor
B Pump
C Hose Intake
D Unloading Valve
E Injector Valve
F Thermal Relief
G Spray Gun
H Lance
I Nozzle
