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2-4 Automatic Pressure Control DevicesAutomatic Pressure Control Devices Types of Devices Pressure relief valves Pressure governor Purpose Control excessive pressure Protects fire fighters and equipment from water hammer Works on the principle of pressure differential Discharge Pressure Relief Valve OPERATION Pressure side of the pump to the inlet Adjustable Components Pilot valve/controller Four-way valve Relief valve Four-way valve Pilot valve Discharge Pressure Relief Valve Intake Pressure Relief Valve OPERATION Excess pressure from the supply line Some not easily adjustable External to pump panel or internal on pump External Relief Valve Internal Relief Valve Control Pressure Governor PURPOSE Controls excessive pressure Protects fire fighters and equipment OPERATION Opening and closing the throttle to the engine Electronic Manual Pressure Governor