Patent ID: 6280159
Filing Date: 2001-08-28
Classification: F01C,F04B,F04C,F16H,G05D,Y10T

Abstract:
A valve arrangement for use with a pump, the valve arrangement comprising:a pressure limiting valve;a flow regulator valve, the pressure limiting valve being connected with the flow regulator valve for limiting the pressure in the flow regulator valve;the flow regulator valve comprising a valve chamber with a direction of extension,a flow regulator piston in the flow regulator valve chamber and movable therealong in opposite directions;the flow regulator piston separating the valve chamber;the piston having a pressure side for receiving pressure in a first pressure chamber of the valve chamber, the first pressure chamber is at one side of the piston, the piston having a pressure return surface at an opposite side of the piston from the one side, the pressure return surface receiving pressure in the valve chamber at the opposite side of the piston;the pressure return surface of the flow regulator piston includes a first part which communicates on the pressure return side of the piston as to be operable at a first pressure p1 and includes a second part which communicates on the pressure return side of the piston so as to be operable at a second pressure, wherein the first and second pressures may be different.