Abstract: A rotary valve of generally cylindrical configuration is arranged to drive two piston-type hydraulic motors by distributing fluid under pressure and return pressures to and from a series of motor ports which match the inlet ports of the motors. Fluid at inlet pressure and at return pressure is distributed through a series of axial passageways to a number of distribution ports. The distribution ports, which would be extremely complex to fabricate with usual casting or machining techniques, are formed of a number of series of stacked disks whose output or input openings are controlled by a rotary member having radial openings and axial passageways. The disks are formed with a symmetrical pattern of ports such that when flow is initiated from a given opening an oppositely disposed opening also will initiate flow, thus radially balancing the forces.