Metering / Dosing Pump

Overview

A dosing pump exists to deliver an exact, repeatable amount of a fluid, chlorine into drinking water, coagulant into a treatment line, additive into a process stream, rather than just to move bulk volume. It does this by reciprocating: each stroke draws in and then expels a precisely set slug of chemical, and the dose is trimmed by changing how far and how often it strokes. Accuracy at very low flow, against system backpressure, is the whole point.

The Pump Head is the liquid end where the dose is formed and metered through two check valves. The Stroke Drive supplies the stroke, the Stroke Adjust sets the volume per stroke, and the Control Board paces and trims the dosing. The Housing carries the drive and electronics, and the Connectors brings power and signals in.

How it works

On the suction stroke the Dosing Diaphragm pulls back and lowers pressure in the head; the discharge Check Valve stays shut while the suction check lifts and fills the chamber. On the delivery stroke the diaphragm pushes forward: the suction check closes and the discharge check opens, expelling exactly the swept volume. Each check is a Check Ball on a Check Seat, and because metering accuracy lives or dies on those balls sealing cleanly, dosing pumps usually run two checks in series per port.

The stroke comes from one of two drives. A solenoid type pulses the diaphragm directly with a Copper Winding coil, simple, with rate set by pulse frequency. A motor-driven type spins a Stator Assembly/Rotor Assembly motor through a Helical Gear Pair and a Eccentric Cam, turning rotation into a smooth Push Rod stroke for steadier, higher-pressure metering. The Stroke Adjust caps push-rod travel to set volume per stroke, while the Control Board, a Bare PCB board with an Microcontroller reading a Pressure Sensor, sets the rate and can pace dosing to a flow signal so the chemical tracks the process even as conditions change.