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10m Hose for Pressure Washer
10m Hose for Pressure Washer
£60.00  £42.22
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Eco Pressure Washer
Eco Pressure Washer
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Safety Valve and Blow Off Valve

Safety Valve and Blow Off Valve
The safety or blow off valve on a pressure washer are essentially the same thing, this is a small valve which is located after (in series) the unloader or bypass valve. these are oftem placed under the coil of the boiler or on the outlet as these valve just dump the water on to the floor to stop the coil or other piping inside the machine from blowing.
The reason for the use of the safety valve is for over pressure reasons, the reason that the pressure washer will often over pressure is due to blockages in the jets or piping, but more often than not it is the unloader valve sticking. The unloader or Bypass valve will stick either due to not enough greasing up or foreign bodies in the unloader valve itself. Now if the safety valve is a blow off of a certain type some are not repairable as they are of 'single use' often having a membrane plate set to a certain pressure and if the pressure washer goes over that rating the the plate will blow letting the over pressure water out of the pressure washer. If the safety valve is the spring type the ones the over pressure problem is fixed then the valve will be fit for use again.
If the overpressure was caused by the jets blocking simply turn the jets around and wash them through if this does not clear the blockage then simply put a pin down the jet and push the debris out.
If over pressure was caused by a piping blockage simply clear the blockage either with pipe clearing equipment or by using a descaler liquid in the case of the coil being blocked.
If the unloader bypass valve is not doing its job it needs to be stripped and cleaned out and an inspection of especially the seals, spring, shaft and seat. then the worn part need to be replaced with new and the whole thing reasebled and tested, if this does not fix it, a new valve is usually best, the stripping and reasemble can often take 2 hours and a lot of people just replace the complete valve now adays as its cheaper to do this than to play with it.


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