What is a Dosing pump and its uses

A Dosing pump is a special volumetric pump that can meet the needs of various strict process flows. The flow rate can be adjusted steplessly within the range of 0-100% and is used to transport liquids (especially corrosive liquids). A Dosing pump is also called a quantitative pump or a proportional pump. A Dosing pump is a reciprocating positive displacement pump used for precise metering. The stability accuracy of the Dosing pump is usually required to be no more than ±1%. With the continuous development of modern industry towards automated operation and remote automatic control, the advantages of Dosing pumps with strong matching and wide adaptability to media (liquids) are particularly outstanding.

Structure and working principle of Dosing pump: The Dosing pump consists of three parts: a transmission base component, a pump head component, and a motor. The transmission base component is driven by the motor to rotate the worm, and the power is transmitted to the N-shaped shaft through the worm gear and the lower sleeve. The N-shaped shaft and eccentric block drive the crank connecting rod mechanism and the crosshead to drive the plunger to reciprocate; the stroke of the plunger is adjusted by adjusting the rotary eccentricity through the N-shaped shaft and the stroke adjustment mechanism, thereby adjusting the flow rate; as the plunger reciprocates in the cylinder, the suction and discharge valve groups open and close alternately, and the liquid is continuously sucked in and discharged from the hydraulic end; during the suction stroke, a negative pressure is formed in the liquid cavity of the pump head, causing the suction valve to open and the liquid to flow into the cylinder cavity; during the discharge stroke, the movement of the plunger increases the pressure on the liquid, causing the discharge valve to open and discharge the liquid.

Working principle of Dosing pump The Dosing pump is mainly composed of three parts: power drive, fluid delivery and regulation control. The power drive device drives the fluid delivery diaphragm to achieve reciprocating motion through a mechanical linkage system:

The diaphragm (piston) sucks in the delivered fluid in the first half of the stroke and discharges the fluid from the pump head in the second half of the stroke; therefore, changing the reciprocating motion frequency of the stroke or the stroke length of each reciprocating motion can achieve the purpose of adjusting the fluid delivery amount. Precise machining accuracy ensures the amount of each pump out and thus achieves precise metering of the delivered medium.


A pump specially used for metering and delivering liquids. Most Dosing pumps use the structure of plunger pumps and diaphragm pumps (see reciprocating pumps), and some use the structure of gear pumps, because they can maintain

Mechanical diaphragm Dosing pumps

constant flow rate that is independent of the discharge pressure. Metering pumps are of two types: adjustable flow rate and non-adjustable flow rate. The former has a wider range of applicability.