a four way directional control circuit ports 56 c and 56 d of bridge passageway 56 are hydraulically connected across a face of conical base end 52 of rotor 51 rotor passageways 55 a and 55 b hydraulically connect a face of conical base end 52 through to the opposite side of rotor 51 this hydraulic path provides pressure balancing of rotor 51 as well as a continuous flushing of particles from the valve housing 20 when in service when rotor 51 is rotated 90 degrees to the second rotational position fig4 radial passageways 38 a and 38 d are connected via partial circumferential bridge passageway 58 and radial passageways 38 b and 38 c are connected via first rotor passageway 55 a and second rotor passageway 55 b in the present configuration rotor 51 is designed to operate in two positions 90 degrees apart the present configuration provides a four way direction control circuit in position 1 radial passageways 38 a b and 38 c d are hydraulically connected in position 2 radial passageways 38 a d and 38 b c are hydraulically connected in the embodiment shown two ports associated with radial passageways 38 a d are slowly closing during rotation while the other two ports associated with radial passageways 38 a d slowly open this prevents pressure spikes during rotation radial alignment is provided by the mating of the two conical surfaces 36 52 in a preferred embodiment the angle of the mating cone shaped components 36 and 52 is 30 degrees the angle is designed to give sufficient centering forces for rotor 51 when rotor 51 and seat.