Patent ID: 6499505
Filing Date: 2002-12-31
Classification: F15B,Y10T

Abstract:
A hydraulic valve arrangement comprising: a control valve, which, in a first operating position, connects a motor connection with a pump connection, in a second operating position, connects the motor connection with a tank connection, and, in a locking position, disconnects the motor connection from the pump and tank connection, and with a locking valve coupled between the control valve and the motor connection, dividing a motor line into a first section allocated to the control valve and a second section allocated to the motor connection, a pressure release valve made as a seated valve being provided for the locking valve, an operating element of said pressure release valve being loaded in a closing direction by pressure in the first section and a spring and in an opening direction by a constant control pressure acting in dependence of the position of the control valve and, when operated, releasing the pressure in a spring chamber acting in the closing direction of the locking valve to the first section, wherein a seat of the pressure release valve is fixed to a housing.