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Nozzle: A device for the metering of uids. The size and machining of the orice
determines the spray pattern as well as the rate of ow for a given pressure.
Unloader Valve: A mechanical device that adjusts itself due to the rate and pressure
of uid owing through it. In a pressure washer, the unloader valve reroutes water
through the pump when the gun trigger is released. This allows the water to circulate
through the pump without undo pressure building. The unloader valve can be used as
a pressure regulating device in certain situations.
Pressure Switch: An electrical switch that activates at preset pressure levels through
the function of a diaphragm. The pressure switch is used to control the fuel solenoid
in the burner system.
Pressure Relief Valve: A protective mechanical device that opens to atmosphere
when the system pressure exceeds a preset level. NEVER tamper with or modify the
pressure relief valve in anyway. SERIOUS INJURY or DEATH may result.
Pressure Wand Assembly: The collection of parts that includes the gun, wand and
nozzle.
Hour Meter (if equipped): An analog or digital display timing device that records how
many hours the pressure washer engine has ran in its lifetime. Use this information
for preventative maintenance service intervals.
PSI: Pounds per Square Inch. The unit of measurement for uid or gas pressure.
Exceeding the maximum operating pressure could result in damage to the unit,
SERIOUS INJURY or DEATH.
Pump: Mechanical device that accelerates the movement of water through the
pressure washer system. The pressure is created by the restrictive ow of the nozzle.
Temperature Control: A device that controls the temperature of the water. The
adjustable temperature control (if equipped) allows the operator to tailor the
temperature to the cleaning requirements. Never set the control above 195
o
F. The
burner will automatically shut o if insucient water ow through the burner coil
causes the temperature to rise above the setting.
Temperature Relief Valve (TRV): A protective device that opens to atmosphere
should the temperature rise above a preset level. The TRV is typically located on
the output side of the pump. Should the water temperature rise too high due to
recirculation, the valve will open allowing cooler water to enter the pump. The valve
will then close.
Water Column (if equipped): A measurement of NG or LP gas pressure by the
displacement of water within the manometer measuring device.
Water Supply: The source of water for the pressure washer. Typically the minimum
requirement is twice the rated volume for the machine at 20 PSI.
Wand: Also known as a lance, is the extension piece from the gun to the quick
connector for the nozzle.
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