Profile: Precision Machine & Manufacturing, Inc. is a manufacturer of rotary valves and screw conveyor products. Our products include PMV rotary valve, precision rotary feeders, screw conveyors and precision microvalve. Our precision rotary feeder is available with an optional feeder-mounting frame with an injector tee, check valve and bottom knife access door custom designed to fit line size & centerlines. Our precision micro-valves is developed to handle small to medium applications.