Patent ID: 6430923
Filing Date: 2002-08-13
Classification: F15B,F16H

Abstract:
A loop flushing circuit comprising:a variable displacement hydraulic pump; a hydraulic motor fluidly connected to the pump in a closed loop circuit by first and second system pressure lines; the first and second system pressure lines each having a respective pressure therein, one of the first and second system lines having lower pressure therein than the other of the first and second system pressure lines whenever the pump has a non-zero displacement; a case drain line associated with at least one of the motor and the pump; a two-port loop flushing valve having an inlet port fluidly connected to only one of the first and second system pressure lines and having an outlet port selectively connected to the case drain line; the loop flushing valve having an open first position wherein the system pressure line to which the inlet port is connected and the case drain line are fluidly connected; and the loop flushing valve having a closed second position wherein fluid flow between the system pressure line to which the inlet port is connected and the case drain line is blocked in two directions by the valve.