Nominal flow: 13gpm (60L/min); Relief valve: Adjustable; Center system: Open; A, B ports: 1/2 BSPP; P, T, N port: 1/2 BSPP. A, B ports: 1/2 BSPP. P, T, N port: 1/2 BSPP. Max Flow: 13 GPM. Inner relief valve: The relief valve inside the valve body is able to adjust the hydraulic system working pressure.