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Pressure Relief Valve, AKA an insurance policy. Relief valves should be fitted to all water pumps. If something goes wrong, this valve will stop your pump exploding.
Fitting a pressure relief valve to your water truck will minimise the effects of water hammer on your water pump and spray valves.
Relief valves are factory set to 80PSI but are adjustable, Once the water pressure spikes over the set pressure the valve will open momentarily to release the pressure then close again.