Liquid metering device for metering pumps

Liquid metering device (1) for metering pumps, characterized in that it is formed by a main longitudinal conduit (2) with a first and second opposite ends (2.1, 2.2) comprising

• a fluid inlet (3) suitable for the connection thereof to a metering pump, arranged at the first end (2.1) of the main conduit (2) in a manner perpendicular thereto;
• a first backpressure fluid outlet (4) arranged at the second end (2.2) of the main conduit (2), and;
• a first connection (5) to backpressure control means (6), a second connection (7) to safety means (8) and a second overpressure fluid outlet (9), arranged in one and the same connecting section (10) of the main conduit (2) close to the second end (2.2) thereof, where said first and second connections (5, 7) are located opposite one another with respect to the axis of the main conduit (2) such that the backpressure control means (6) and the safety means (8) act in parallel and in an independent manner, and where the main conduit (2) has inside said connecting section (10) an inclined wall (11) for concentrically distributing the fluid to the backpressure control means (6) and to the safety means (8) and allows the fluid to exit through the first backpressure fluid outlet (4) when the fluid pressure is equal to or greater than a fixed backpressure pressure value and the fluid to be discharged through the second outlet (9), when the fluid pressure is equal to or greater than a fixed safety value.