Rotary valve and directional valve combination

A rotary distribution valve and directional spool valve in combination with a selectively reversible air motor for use with an air motor operated hoist or the like comprising:

• a selectively reversible air motor;
• a valve body for receiving a supply of compressed air and selectively distributing said compressed air to said selectively reversible air motor;
• a rotary valve disposed in a valve first body bore in said valve body and driven in rotation by said selectively reversible air motor receiving a circumferentially distributed supply of air from said rotary valve in sequential order to operate said air motor;
• a spool valve disposed in a valve second body bore for reciprocation from a forward position supplying air to said rotary valve to effect forward rotation of said air motor and to a rearward position supplying air to said rotary valve to effect reverse rotation of said air motor;
• said first body bore and said second body bore are interconnected by a first passageway and a second passageway alternately supplying and exhausting air from said spool valve to a first rotary valve end air chamber and a second rotary valve end air chamber and therefrom respectively to a first face end of said rotary valve exposed to said first rotary valve end air chamber and to a second face end of said rotary valve exposed to said second rotary valve end air chamber to effect distribution and exhaust of air to and from said motor;
• said rotary valve is further provided with opposed circumferential distribution ports which sequentially registers in rotation with distribution ports for said air motor to effect supply and exhaust of air to and from said air motor;
• said rotary valve is provided with end face entry and radial exit of supply air and conversely radial entry and opposite end face exit of exhaust air;
• said rotary valve is provided with radial exit slots having different timing in registering with said distribution ports for said air motor to effect a different supply and exhaust timing for said air motor;
• and
• said rotary valve is mounted on an air motor driven shaft and reversible on said shaft at assembly to accommodate the difference in valve timing for selected primary clockwise or counterclockwise rotation of said air motor.