Pressure proportioning regulator valve and vane machine including same

A vane machine comprising a housing provided with an inlet connector and an outlet connector;

• a rotatably mounted rotor (112) provided with a plurality of circumferentially distributed radial slots (114);
• a plurality of vanes (15) each having a first end (116) and a second end (118) opposite the first end, each of said vanes (115) being guided movably in one of the radial slots (114) with the first end thereof inside said radial slot to form a compression chamber (117) therein bounded by walls of said radial slot, and the second ends (118) of said vanes being located outside the radial slots;
• a mechanism wall (119) on which said second ends (118) bear to move each of the vanes in the radial slots through a compression stage, a vacuum stage and two reversing stages during a revolution of the rotor (112) thus changing a volume of each of the compression chambers (117);
• at least one housing-side compensation duct (132) provided for a pressurized medium supplied to the compression chambers (117) to permit a flow of the pressurized medium from the inlet connector to the outlet connector and a pressure proportioning valve (10) for supplying the pressurized medium to the compression chambers (117) at an intermediate pressure depending on the system pressure so as to maintain a constant pressure ratio of the intermediate pressure to the system pressure, the least one housing-side compensation duct (132) being arranged so that the pressurized medium located in each of the compression chambers (117) loads the first ends (116) of said vanes with the intermediate pressure when each of said vanes passes through at least one of the two reversing stages;
• wherein said pressure proportioning valve comprises
• a valve housing (11) provided with a throughgoing passage (12) having an inlet (13), a return duct (15) and an outlet duct (14), said outlet duct (14) being connected with said at least one compensating duct (132) and said inlet (13);
• a valve gate (22) guided movably in the throughgoing passage (12), said valve gate (22) having a pressing surface (43) acted on by a pressure at the inlet (13) and another pressing surface (44) acted on by a pressure in the outlet duct (14);
• and means for reducing said pressures while maintaining a constant pressure ratio of said pressure at said inlet (13) to said pressure at said outlet duct (14), said means for reducing said pressures including a first control edge (29) arranged on the valve gate (22) between the inlet (13) and the outlet duct (14);
• means for controlling a connection between the outlet duct (14) and the return duct (15) and a flow of a pressurized medium between the outlet duct (14) and the return duct (15), said means for controlling comprising a second control edge (30) provided on the valve gate (22);
• wherein the valve gate (22) is divided into two parts consisting of a piston (24) and a sliding control member (23), said pressing surface (43) and said control edge (30) are arranged on said sliding control member (23), said another pressing surface (44) is provided on said piston (24), said another pressing surface (44) is larger than and coaxial to said pressing surface (43) and said pressing surfaces (43,44) are arranged in said throughgoing passage (12).