How does an unloader valve work?

The Unloader valve is designed to respond to an increase in pressure or a change in water flow. The trigger shuts off the water flow, causing the unloader valve to re-circulate the water back to the header tank or alternatively back to the inlet side of the pump. This is sending the water into bypass.Click to see full answer. Just so, how does an air compressor unloader valve work?What the unloader valve does is that is responds to the compressor pressure switch turning the power off to the motor and allows any air that may be trapped over the piston, or pistons on a multi-cylinder air compressor, to vent to atmosphere, removing any load that the trapped air may have created over the cylinderSubsequently, question is, how does an unloader work? The unloader diverts the flow of water from the outlet side of the pump back to the inlet side, causing water to flow in a loop back to the pump under virtually no pressure rather than to the nozzle under operating pressure. Flow may be directed back to the pump inlet or to a float tank or other type of reservoir. Additionally, what is the function of unloader valve? Your reciprocating piston compressor will have a smooth start up, thanks to the unloader valve. The air compressor unloader is valve is a small, but important, part of the reciprocating piston compressor. It blows off the pressure inside the discharge pipe when the compressor stops.How do you set an unloader valve? How to Set the Unloader Valve or Pressure Regulator Make sure the engine or motor is spinning at the proper rpm. Use a new high power washer spray nozzles of the proper size orifice for your pressure washer. Remove the nylock nut off the top of the unloader valve and spin the black plastic pressure adjusting knob off.