A valve that uses a ball to seal against a seat to stop flow in one direction.
A valve that permits flow in one direction only by lifting a spring loaded ball off its seat when a pressure differential acts in that direction and by forcing the ball more tightly against the seat when a pressure differential acts in the opposite flow direction.
A device mounted at the discharge end of an injection screw used to allow forward flow of plastic during recovery and no flow during the injection stroke. This valving is accomplished by positioning of an internal ball.
Valve assembly (ball) which permits flow of fluid in one direction only.
