5 Metering Pump Manufacturers in 2022
This section provides overview, applications, and principles of metering pumps. Also, please take a look at the list of 5 metering pump manufacturers and their company rankings.
Table of Contents
What Is a Metering Pump?
A metering pump is a device that repeatedly pumps a fixed volume of liquid, making it suitable for accurate injection of liquids such as chemicals with excellent repeatability of discharge volume.
In order to accommodate liquid pumping applications in various fields, metering pump use electric or air drive systems as the drive source, and reciprocating mechanisms such as diaphragm pumps. Rotating mechanisms such as vane pumps are used for the mechanism of metering pumps that pump a fixed amount of liquid.
For metering pump with excellent corrosion resistance to chemicals and other liquids, another feature is that they are made of materials that can withstand low to high viscosity chemicals and other liquids.
Uses for Metering Pumps
Metering pumps are suitable for accurately injecting liquids such as chemicals with excellent discharge volume reproducibility, and at the same time, some pumps are made of materials that can withstand chemicals. These are used in a variety of fields.
In particular, the use of metering pumps in the medical field requires more accurate control of liquid volume and reproducibility since a minute increase or decrease in the amount of chemical solution may endanger human life.
Principle of Metering Pumps
Metering pumps can be broadly classified into reciprocating pumps and rotary pumps.
1. Reciprocating Metering Pumps
Reciprocating plunger pumps are designed to suction and discharge liquid by changing the volume of the plunger repeatedly, which is a rod-like piston, through a reciprocating motion, thereby continuously pumping high-pressure, constant volume liquid.
Piston pumps use the same reciprocating piston motion as plunger pumps, but the seals and valves used for pumping are on the piston side, while the seals and valves used for pumping are on the plunger pump body.
A diaphragm pump with a reciprocating mechanism pumps a fixed volume of liquid by changing the volume through the reciprocating motion of an elastic membrane, such as resin.
2. Metering Pumps with a Rotary Mechanism
Screw pumps with a rotary mechanism pump a constant volume of liquid with very little pulsation by rotating a threaded rotor inside a cylindrical pump or by repeating rotation and eccentricity to pump along a threaded groove.
A gear pump with a rotary mechanism pumps a fixed volume of liquid by meshing two gears and rotating the gears and moving the space inside the casing.
A vane pump with a rotary mechanism has an impeller-like vane slightly off-center of the pump and pumps a fixed volume of liquid by centrifugal force generated by the rotation of the vane and the movement of the space inside the casing.
Other Information Related to Metering Pumps
1. How to Eliminate Pulsation in Metering Pumps
Metering pumps ensure time-averaged metering by repeatedly suctioning and discharging a fixed volume of liquid. Because the flow rate increases or decreases during a single suction and discharge operation, the discharge rate of many metering pumps pulsates in a short period of time.
Diaphragm pumps are particularly prone to pulsation, with fluid flowing at the moment the diaphragm is actuated and no flow occurring while the diaphragm is stationary. Rotary positive displacement pumps, such as gear pumps, do not seem to pulsate when the flow rate is high, but pulsation appears when the flow rate is reduced and the rotation speed decreases.
Pulsation is a major problem in applications where a constant discharge rate must be maintained. Also, when a diaphragm pump produces a large instantaneous flow rate, the piping diameter must be larger to match the peak flow rate compared to a pump without pulsation.
To reduce pulsation, it is effective to introduce a mechanism called an air chamber or accumulator downstream of the pump to absorb pressure changes. It is also possible to cancel pulsation by installing multiple diaphragm pumps in parallel, with the phases shifted so that there is virtually no pulsation. Pumps such as plunger pumps and syringe pumps, which dispense a fixed volume by pushing a piston in one direction, do not cause pulsation.
2. Flow Rate Adjustment Method for Metering Pumps
For rotary positive displacement pumps, such as gear pumps and tube pumps, the flow rate is adjusted by controlling the rotation speed with an inverter.
For diaphragm pumps, the flow rate is adjusted by adjusting the stroke width and changing the number of strokes. Diaphragm pumps are available in a variety of drive systems, but for metering applications, motor-driven pumps and electromagnetic (solenoid) pumps are the main types.
3. Types of Small Metering Pumps
The following types of metering pumps are typical for handling minute flow rates of a few µL/min.
Micropumps: Micropumps are sometimes used to refer to pumps with extremely small flow rates in general, but the most commonly used type is the ultra-compact diaphragm pump that uses a piezoelectric element.
Tube Pumps: These pumps use multiple rollers attached to a rotating rotor to push liquid through a tube continuously. It has a simple mechanism with high quantitative performance and is used for pumping liquid for analytical instruments and adding medicines.
Syringe Pumps: Syringe pumps are designed to push a syringe at a constant speed and are capable of supplying minute flow rates with absolutely no pulsation. However, it is a batch process and cannot be used for continuous supply. This pump is used for medical applications.
List of 5 Metering Pump Manufacturers
*Including some distributors, etc.
Sort by Features
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- Company Size: largest first
- Year Founded: oldest first
- Year Founded: earliest first
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Milton Roy
Metering pumps
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LMI Pumps
Metering Pumps
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Metering Pump Manufacturer Ranking
*Including some distributors, etc.Ranking as of January 2023 in United States
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | LMI Pumps | 66.7% |
| 2 | Milton Roy | 33.3% |
Ranking as of January 2023 Globally
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | LMI Pumps | 66.7% |
| 2 | Milton Roy | 33.3% |
Derivation Method
The ranking is calculated based on the click share within the metering pump page as of January 2023. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
- The ProMinent Group: 1960 (63 years ago)
- LEWA GmbH: 1952 (71 years ago)
Company with a History
- LEWA GmbH: 1952 (71 years ago)
- The ProMinent Group: 1960 (63 years ago)
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