Abstract: A hydraulic control device for an automatic transmission including a valve device. The valve device comprising a switching valve, featuring a switching component and a check valve. The switching valve is formed in a housing and is hydraulically connected to a first pressure adjusting device and a second pressure adjusting device along with a shift element for transferring a certain torque. The switching valve is formed as a directional seat valve.

Abstract: A hydraulic control device for an automatic transmission featuring at least one valve device (1), the valve device (1) comprising a switching valve (10), featuring a switching component (11) and a check valve (20), whereas the switching valve (10) is formed in a housing (30) and is hydraulically connected to a first pressure adjusting device (HCU) and a second pressure adjusting device (EDS) along with a shift element (K) for transferring a certain torque, whereas the switching valve (10) is formed as a directional seat valve.

Abstract: Described is a radial piston pump with a pump housing (3), which has a plurality of cylinder bores (5) arrayed in star shape around a cam (4), for the reception of pistons (6) and possesses inlet (7) and outlet (8) when penetrate to each cylinder inner chamber (9) with a therein compressible working volume. In accord with the invention, each cylinder inner chamber (9) is provided with at least one relief opening, which connects the working volumes during a compression stroke of the piston (6) with a space of lesser pressure for the reduction of the pressure gradient and also thereby reducing the noise of the pump.