A metering pump is a pump used to accurately dose and deliver liquids or chemicals. Its primary function is to accurately deliver a liquid to a target location based on a predetermined dosage or flow rate. Metering pumps usually have adjustable flow controls that allow the output flow rate to be precisely adjusted as needed.
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A dosing pump is a pump used to accurately add chemicals or other additives to a fluid system, with an adjustable flow control device that allows for precise adjustment of the amount of chemicals to be delivered as needed. This ensures that the concentration and dosage of the chemical is within a specific range to meet the requirements of the treatment process and to guarantee optimal treatment results. Dosing pumps are usually made of high-quality materials and advanced technology to ensure their stable and reliable performance, and at the same time, they can adapt to different working environments and requirements. For example, pH adjustment, disinfectant delivery, and control of chemical reactions in water treatment.
Dosing/metering pumps are used in various industries such as pharmaceuticals, food industry, water treatment industry and many more.
In each of these industries, there is a need for a system that can inject measured quantities of substances into the fluid stream, and dosing/metering pumps fulfill this need perfectly.
The choice of different dosing/metering pumps depends on:
A piston/plunger metering pump consists of a housing in which a plunger or piston is placed. As the piston reciprocates within the housing, fluid is drawn into the chamber during the suction stroke and then pushed out during the discharge stroke. The volume of the chamber and the position of the piston allow us to know precisely the amount of fluid being metered into the fluid stream.This system makes piston/plunger metering pumps the most accurate of the different metering pumps for metering fluid. Chemical feed pumps, for example, inject precise amounts of chemicals into process streams.
Using the peristaltic principle, through the compression and relaxation of the pipeline to promote the flow of liquid, applicable to the need for accurate measurement of the occasion.
Diaphragm metering pump is a pump that uses a diaphragm to transfer liquid. A diaphragm is a membrane made of flexible material that is located between two chambers of the pump. As the pump operates, the diaphragm moves up and down, pressing liquid from one chamber into the other. It uses a flexible diaphragm instead of a piston to change the volume of the pump chamber, thereby increasing and decreasing the pressure of the fluid inside. So it is suitable for liquid transporting flocs.
Pulse metering pump realizes metering and conveying by controlling the frequency and width of pulse wave, which is suitable for occasions requiring fast metering.
Mechanical dosing pumps are commonly used in dosing pumps and are a common type of dosing pump. Mechanical diaphragm pumps move diaphragms back and forth by mechanical actuation for fluid intake and discharge. They are also subject to different levels of wear than piston pumps , mechanical diaphragms are also subject to pulse discharges and other effects. However, this can be mitigated by having two diaphragm settings. Another advantage of mechanical dosing is that their construction makes them hermetically sealed, making them the best choice for toxic fluids.
A hydraulic dosing pump is a dosing pump that uses hydraulic power to drive the dosing mechanism. It controls the flow of dosing liquid by utilizing hydraulic pressure to move a diaphragm or plunger. Hydraulic dosing pumps are widely used in a variety of industries and applications where precise dosing of chemicals or additives is required. One of the advantages of hydraulic dosing pumps is that they can handle a wide range of flow rates and pressures, making them flexible for a variety of dosing needs. HY-ZR series hydraulic dosing pump is an integrated pump that provides precise dosing performance with minimum maintenance. It is integrated with a safety valve to prevent overload pressure.
Dosing pumps provide low volume, controllable discharge rates that are used to inject various chemicals, solutions of various viscosities.
Dosing pumps are also called metering pumps because they pump accurate volumetric rates of fluids.
Dosing pumps are usually made from plastic, thermoplastic, or stainless steel and provided with mounting holes or accessories such as suction, discharge tubes, and fittings.
Dosing pumps are generally attached with an electronic controller that enables the fluid flow to be monitored and adjusted easily.
Depending upon the design requirements, Dosing pumps can be operated based on the principle of dynamic pumps or positive displacement pumps.
Variable flow rates are produced by dynamic pumps, suitable for generating high flow rates with low viscosity fluids.
On the other hand, the positive displacement pumps produce a constant flow suited for producing high pressures (and low flow rates) with high viscosity fluids.
Most dosing pumps are positive displacement pumps, which provide steady, low flow for various types of viscous media.
Positive displacement pumps are of two types
Reciprocating pump work on repeated forward and reverse motion of Diaphragm, Piston, or plunger inside a chamber.
It makes the fluid move from suction to the discharge end.
It utilizes a flexible diaphragm membrane. By expanding the diaphragm, the volume in the chamber increases. The increased volume draws the fluid into the pump.
By compressing the diaphragm, the fluid is pushed out of the pump.
Non-return valves are installed at suction and discharge of the pump.
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By moving the plunger or piston creates a vacuum in the chamber, which draws the fluid into the chamber.
Forward movement of the piston compresses the fluid and pumped out.
This kind of pump provides a continuous flow of solution, chemical dosing. They are Peristaltic, Vane, Lobe, Gear, and Screw pumps.
The PLC systems or independent controllers are used to provide proportional and integral action in dosing control.
The Vane pump consists of a cylindrical chamber in which the vane rotates and dosing of high viscosity fluids against the short head.
Used for dosing liquids having a higher viscosity than water. Pumping action is generated by rotating so-called lobes, which are of two, three, and four-lobe configurations.
The function of gear, screw, and lobe pumps are similar.
In this kind of dosing pump, two gears rotate in the counter-clockwise direction. Forwards the fluid that enters between the gear teeth, provides pulse-free dosing.
Gear positive displacement pumps are selected in applications where accurate dosing, or high pressure output is required. It helps in simple transfer of viscous liquids, with higher pressure. They pump constant amount of fluid for each rotation.
Peristaltic pumps consist of flexible rubber or plastic, friction-resistant tubes. They are often used for dosing pumps because the volumetric flow is proportional to the rotational speed and independent of discharge pressure.
Peristaltic pumps operate by rotating a roller across a hose thereby pushing liquid through the pump.
They are very accurate.
They can handle extremely small flows.
They are self-priming, requires no check valves.
Useful for low pressure applications.
Materials: The base materials of a dosing pump is essential to consider, as it affects the type of media that can be carried out effectively.
Dosing System fluids of different nature may be abrasive, acidic, caustic, very hot, very cold, or otherwise hazardous. Base materials such as plastic, cast iron, and stainless steel own different advantages for handling these various characteristics.
The basic parts of a chemical dosing system are as follows.
As dosing pumps deal with hazardous chemicals, with high temperature and pressure following precautions need to be taken.
Dosing pumps are
It is used for pH neutralization in various industries such as
Reference: Pumping Manual by Ronald Horace Warring.
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