A True Blue air actuated ball valve with a limit stop can maintain any desired set flow from virtually closed up to full capacity of the valve. Two types are available, one for air x air actuators (Actuators ABVA & ABRA) and one for air x spring "fail safe" actuators (ABVS & ABRS).
A simple stainless steel adjusting screw is used to limit the stroke of the air actuator position. Turning the adjusting screw clockwise limits the opening of the ball valve. The limits stops can also be used with limit switches for throttling.
