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Pressure Washer Glossary of Terms

 
Here are some terms commonly used with pressure
washers and in the pressure washing industry.
Also see Pressure Washer Trouble Shooting
 
Term What it means
 
Belt Drive The belt drive system will slow the RPM of the pump depending on the pulley and belt set up. This system increases pump life because the bearings get less wear and the belts and pulleys are separated from the heat of the engine. The downside to belt driven systems is that belts and pulleys create more friction which creates less efficiency
   
Bypass Mode When the trigger is released, the water goes into this mode. If you leave a machine in bypass mode only a few minutes, you risk overheating and damaging the pump.
   
Chemical Injector Allows soap or a chemical to be injected into the water stream to make cleaning surfaces faster and easier
   
Direct Drive In a drive washer system, the washer pump is directly connected to the engine, which spins the pump at the same RPM as the engine. The downside to the direct drive washers is that the bearings receive more wear, which reduces the life of the pump.
   
Gallons Per Minute (GPM) A measure of the volume of water that flows through the pump. The higher the GPM can result in faster cleaning.
   
Pounds Per Square Inch (PSI) The unit of pressure that determines how much pressure is being applied to the surface.
   
Pressure Gauge A gauge that informs the operator of both the working pressure and peak pressure of the unit.
   
Purge A method of abolishing air from the washer so that starting the engine is easier
   
Spray Nozzle (Washer Tip) An interchangeable tip that is able to create different fan angles. The spray nozzle is located at the end of the units wand. Tips come in four different degrees: 0º - Red, 15º - Yellow, 25º - Green, 40º - White
   
Teflon Tape Teflon tape is used to seal pipe threads that are being joined together. It can be used to seal water, air, and gas from leaking through threaded connections
   
Thermal Relief Valve When a unit is run in bypass mode for long periods of time, the water temperature in the pump heats up, which can ultimately cause damage. A thermal relief valve judges the temperature in the pump, and dumps this hot water while bringing in cold water, preventing damage to the pump.
   
Unloader The unloader relieves water pressure in the pump whenever the spray flow is obstructed.
   
Wand Device that extends the water away from the gun