HOW CAN DOSING PUMPS HELP YOU?

A Dosing pump is a small, positive displacement pump. It is designed to pump an exact chemical or substance flow rate into a water, steam or gas flow.

OPERATION PRINCIPLE

Irrespective of the excellent diversity of pump sorts, the quantity of delivered liquid will be adjusted solely in volumetrical pumps with a unique system. In pumps with the liquid pumping principle supported by centrifugal or mechanical phenomenon forces (centrifugal pumps, vortex pumps, screw pumps and others), the delivered fluid flow management is insufficiently precise and delayed; the running flow is measured, the flow is analyzed, and also the feedback procedure is employed to send the management signal to the mechanism (the management valve, the hydraulic clutch, the variation or the motor variable frequency driver) that implements ordered repetitious interpretations to manage the flow. In pumps implementing the volumetrical operation principle, the specifically fastened liquid volume is rapt in every complete pumping cycle; this volume may be an operation of the effective pump operational volume, i.e. the distinction between the functional house volume at the time once the suction method is complete and also the residual practical house volume at the time once the liquid discharge method is comprehensive. As a result, metering is feasible with a high degree of accuracy; for this purpose, the frequency of operational cycles or adequate functional volume of the metering pump shall be adjusted. In volumetrical pumps (unlike the pumps during which the centrifugal or mechanical phenomenon operation principle is used), the metered volume doesn’t rely considerably on external method factors like pumped-up liquid consistency variations or pressure variations at the suction water or at the metering chamber (these variations arise from time to time as a result of changes to raw materials, method disturbances or variations of external temperature or method temperature). Also, as the parameter, ers will be calculated precisely and stay stable no matter the external factors; these pumps will be integrated into the systems with a high level of automation and high exactitude of metering. These factors unit the backgrounds for the broad application of volumetrical pumps for metering functions.

Peristaltic metering pump area unit is foremost effective in using Associate in a Nursing operational house during a single cycle. One process’s functional volume is injected into the metering chamber and meets the excellent working book. During this sort of pump, hoses stuffed with medium-to-be-metered area units are placed into special pass chutes, with the concave surfaces of those hoses clamped by rollers; the rollers, fixed on the motor rotor, rotate and roll over the hose on its length. Whereas the rollers move, they press the liquid from the suction water towards the injection chamber. Rollers transfer unceasingly on the complete length of the hose; as a result, the liquid volume fastened within the hose between 2 ordered rollers is the adequate operational volume. To manage the metering, a rotor’s rotation frequency bearing the rollers shall be adjusted for existing pump models. n essence, the factors determine the plant characteristics in terms of the metered liquid flow area unit, the diameter of hoses (the good working book), the number of passes within the pump and the peripheral speed of rollers that confirm the frequency of active volume injection cycles.

Peristaltic pumps area unit with success utilized in laboratories and small-scale producing facilities with low flow rates, low pressures, and low automation levels. These pumps area unit terribly effective to pump small amounts of aggressive and caustic liquids, as a result of the operational medium is totally separated from the mechanism, and there are not any seals that area unit the foremost sources of leaks throughout operation; to an outsized extent, responsibility and safety of a peristaltic metering pump rely on the fabric of hoses and on their resistance to the pumped-up liquid and to multiple deformations.

Diaphragm (membrane) metering pumps area unit less effective than peristaltic ones; however, they’re additional convenient for operation and additionally reliable. During a membrane pump, the operational volume of the pump is within the chamber with a membrane, which is restricted by the suction check valve and the injection check valve. The minimum functional book is the chamber volume obtainable at the time once the valve is closed at the suction water facet; the most operational book is the chamber volume available at the time once the check valve is closed at the pressure side, i.e. once the metering pump membrane displaces the metered liquid from the chamber during the most extent and starts to manoeuvre backwards. The practical operational volume in membrane pumps is considerable. Still, in peristaltic pumps, due to the diaphragm not pressing the whole book from the bouncy house and, as a result, li, little stray flows exist once the check valves operate. The factors determine the characteristics of the membrane metering pump area unit, the realm of a membrane (a diaphragm), the membrane movement amplitude and the frequency of injection cycles. For existing pump models, the frequency of injection cycles or membrane movement amplitude shall be adjusted to manage the metering.

The advantages of diaphragm metering pumps area units are as follows:

The area unit is applicable in varied branches of trade and is appropriate for integration into machine-driven method lines.
The area unit is the foremost reliable metering pump in terms of operation safety; as a result, they’re freed from seals which will be the source of operational liquid leakages into the surroundings.
Membrane (diaphragm) metering pumps are particularly effective for metering aggressive and toxic liquids; conjointly, they’re most reliable for delivering suspensions containing solid particles. (However, valves will suffer from wear additional intensively, and the adequate operational volume per cycle ought to be exaggerated, whereas the frequency of cycles ought to be belittled as potential.)

Plunger (piston) metering pump area unit is the foremost common in the trade due to their style being capable of achieving high and high flow rates; however, these pumps have many drawbacks in their operation. Like diaphragm metering pumps, the effective operational volume may be a distinction between the functional chamber volumes: the most volume existing at the time once the check valve is closed at the pressure facet minus the minimum volume living at the time once the valve is closed at the suction water side; but, the volume-forming active part during this sort of pumps isn’t a membrane, however, a piston or plunger. as a result of the piston or plunger used, the operational house will be used additional effectively than for the membrane; but, stray flows conjointly exist whereas the check valves gap or closing is current. The factors determining the characteristics of plunger metering pumps are unit the piston diameter and stroke, the number of pistons (single-, double-, three- or five-plunger pumps) and the frequency of operational cycles. For existing pump models, the frequency of piston stroke cycles or length shall be adjusted to manage the metering.

The advantages of the plunger (piston) metering pumps area unit are as follows:

They are appropriate for integrating machine-driven processes with a high exactitude of management and programmable parameters.
High flow rates and pressures will be reached for metering by the customer’s necessities. In several cases, this can be crucial for producing processes.
Plunger (piston) pumps demonstrate high potency and minimum power consumption throughout the metering process.
Small sizes of metering pumps and complete metering units.