Your Guide to Pressure Washer Unloader Valves

Published: 23rd February 2011
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Pressure washer unloader valves are the major "safety" within your pressure washer system. Probably the most widely used is a "pressure actuated" sort of valve. As soon as the pressure gun trigger is pressed the valve detects the stress accumulate and like a "traffic cop" it diverts water flow from the pump outlet directly into the inlet part of the pump. This is whats called "bypass mode." Without this fundamental ingredient this closed-gun situation would increase pressure enough where it might stall the power source, split the washer hose or maybe the pump as well.


The standard feature of the unloader is always to act as a "policeman" to the water flow in your system. Dependent on the sort of valve it will either sense "pressure build" or "reduction in flow". Depending on type, when one example of these circumstances is achieved the unloader will actuate to divert the water flow back again to the inlet side of the pressure pump, where it will rotate through the pump back again to the inlet side of the valve to the inlet side of the pump again in what is known as bypass loop.





Whenever this is taking place the pump is said to be in "bypass mode" and the unloader valve is said to be "cycling". This finishes as soon as the trigger is squeezed alerting the unloader valve to redirect the flow to the high pressure nozzle just as before. Although this may appear to resolve the trouble it's not necessarily without hazards. When the water flow is in bypass new cool water will not be entering the system. The moving parts in the pump are generating friction which creates heat that may be transmitted to the water flow in bypass. Since a limited amount of water is in bypass this exchange of heat can take place quickly.





Most pumps are created to manage water temperatures of 140 F. In the event the water in bypass reaches 155 deg Fahrenheit damage to the pump might commence. Damages can take place to the pump packings, plungers and seals and in many cases to the short bypass hose in external bypass setups. It can be a wise course of action to have a pump that has a thermal relief valve to offer some protection against excessive heat buildup. It can be a better idea never to leave a pump in bypass mode for much more than 2-3 minutes, as by just squeezing the trigger gun you will introduce new cool water in to the system.





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