A Controller (10) for a Flow IV dosing precision Medical Liquid, which comprises: a first part (12),A second part (14) with at least a tubular Connector (20) and an integrated output part (16) of the Union for at least a tubular Connector coupling with integrated input (18),In the first part (12),Second part (14) and (16), Union for coupling made of Molded Plastic material and coupled together with the possibility of rotation around an Axis of rotationThe first part (12) in a single piece, a circular Wall (26) with formation of a Hole (28),When the circular Wall (26) provided with a First surface and a Second Surface (68) (70),The circular Wall (26) at least one slot (34). In each of the first and second surfaces (68) (70) in communication with said tubular Connector (18) entry and COn the tubular Connector (20) exit,A First Board (58) Made of elastomeric material is placed in a separate depression (62) entirely made in a Wall (54) basis of the second part (14),Being the first board (58) provided with at least a First Through Hole (228) to step out of the tubular Connector (20) exit,Being the first Bolt Hole (228) located in coaxial connection with a Second Through Hole (128) formed in a Second Wall (54) basis of the second part (14) in Communication CoN the tubular Connector (20) exit,A Second Board (60) Made of elastomeric material is placed in a separate depression (162) entirely made in a Wall (154) of the base part (16) of the Union for acoplamientOr, being the second Board (60) provided with at least a Third Through Hole (228) for the entrance of the tubular Connector input (18),Being the Third Through Hole (228) located in coaxial connection with the second Through Hole (128) formed on the Wall (54) basis of the second part (14) in communication with COnector tubular (18) entry with the at least one slot (34) dispensing Step scheduled between the Boards First (58) and second (60)The Slot Opening (34) dosage gradually Communication between Said tubular Connect
