Arag 459 series pressure relief valve 1/2 inch BSP(M) x 19 mm hose tail 200 lpm 10 to 50 bar (145 to 725 psi)Arag 459 series pressure relief valve 1 2 inch BSP(M) x 19 mm hose tail 200 lpm 10 to 50 bar (145 to 725 psi) Pressure relief device protects sprayer liquid circuits according to the current European standard UNI EN ISO 4254 6: 2010 which requires all overflow to be returned to the tank in discharge and a maximum overpressure up to 20% of the rated value This relief does not replace a safety valve No valve manual reset operation is required following