Patent ID: 6443419
Filing Date: 2002-09-03
Classification: F02B,F15B

Abstract:
Hydraulic switching valve, comprising a valve casing within it a valve body movable between an opened and closed position, and generally experiencing a permanent spring force in the direction of the closed position, the high pressure level prevailing at the entrance of the valve and the exit pressure prevailing at the exit which pressure has a value between the low system pressure and the high pressure, the valve body having a first sealing edge and a second sealing edge and with it in the closed position of the valve forming three adjacent chambers with the valve casing, the first sealing edge only sealing in the closed position, between the first chamber and the third chamber, and the second sealing edge sealing between the third chamber and the second chamber, the valve body having a first surface on which pressure is exercised in the first chamber which pressure causes a force in the direction of the opened position and a second surface on which in the closed position the pressure is exerted in the second pressure chamber as a result of which a force is caused in the direction of the closed position, characterized by switching valves to selectively and respectively connect the first chamber to high and low pressure, wherein in the closed position the first chamber is connected to low pressure whereas the third chamber is at all times connected to the valve entrance for the high entry pressure and wherein the first surface of the valve body is lager or equal to the second surface.