Unloader valve · Brass 39439.ENPT

• Flow10–30 l/min
• Pressure range22–220 bar
• Inlet connection3/8" BSP(F)

Brass unloader valve with NBR seals for CAT PUMPS high-pressure plunger pumps, typically used with trigger gun, lance and nozzle in a high-pressure cleaning system. When the gun closes, the pressure wave opens the by-pass fully and the entire pump flow circulates at low pressure – this reduces wear, noise and energy consumption while the pump keeps running. When the gun opens again, full flow and full pressure are available at once. The valve regulates the working pressure and protects pump and system against damage from overpressure. The valve mounts directly to the pump (pump connection inlet 1/2" NPT(M), discharge 3/8" NPT(M)); surplus water returns to the pump inlet. Fluid temperature up to 60 °C in continuous duty and up to 90 °C for short periods.