Patent ID: 9744990
Date: 2017-08-29
CPC Classifications: B62D

Claim:
1. A hydraulic steering system comprising a steering unit and a priority valve, said steering unit comprising a working port arrangement (L, R) having two working ports, a supply port arrangement (P, T) having a high pressure port (P) and a low pressure port (T), a load sensing port (LS), a main flow path having a main bleed (A an amplification flow path having an amplification bleed (Au) and being arranged between said high pressure port (P) and said working port arrangement (L, R), said main bleed (A wherein said priority valve comprises a priority outlet (CF) connected to said high pressure port (P) of said steering unit, a valve element moveable in a priority direction to connect an inlet (P and a load sensing connection (LS said priority outlet (CF) being connected to said load sensing connection (LS a pressure at a point downstream said priority bleed acting on said valve element in said priority direction, wherein said load sensing port (LS) is connected to said low pressure port (T) via a drain bleed being (Ad) open in neutral position of said steering handle and closing upon actuation of said steering handle out of said neutral position.