Rotary valve

A rotary valve including a housing, said housing having a center section and an end section attached to each end of said center section, seal means located between the ends of said center section and said end sections, a shaft extending axially through said center section into said end sections, bearing means in each of said end sections rotatably supporting an end of said shaft, said center section and said end sections cooperating with said shaft to define a pair of individual chambers within said housing, a cylindrical rotor having opposed substantially parallel faced located in each individual chamber, said rotors being fixed to said shaft for rotation with said shaft relative to said housing, a continuous groove formed in the periphery of each of said rotors, a plurality of radially and angularly spaced arcuate slots formed in each face of each of said rotors, a plurality of passages formed in each of said rotors, said passages intersecting said arcuate slots and said continuous groove to connect arcuate slots with other arcuate slots and with said continuous groove, passageways formed in said end sections, said passageways having a first end opening into one of said individual chambers and selectively aligned with arcuate slots in said rotors when said rotors rotate with said shaft and a second end opening out of said housing, a plurality of ports formed in said center section of said housing extending between one of said individual chambers and the exterior of said housing, and drive means connected to an end of said shaft to rotate said shaft and said rotors to move said arcuate slots into and out of alignment with the first ends of said passageways formed in said housing end sections.