Leading Chemical Metering Pump Manufacturers

Factors to Consider When Choosing a Chemical Metering Pump

Although the definition of a metering pump sounds fairly clear, the criteria for selecting the best pump rely far more on the application. There can be wide variations in maximum flow rate, maximum pressure, supply voltage, the type of control used, and material compatibility.

Maximum Flow Rate

A pump one requires can be determined by how much chemical solution needs to be added to the process in gallons or liters per hour. Metering pumps with lower maximum flow rates are typically easier and less expensive than other pumps. Some applications, such as smaller factories, require a chemical dosing pump to adequately treat their water before it leaves their plant to comply with local regulations. The pump requirements for these smaller facilities are usually low. Metering pumps are an example that works well for smaller manufacturers who don't require big outputs, with a 3.2 gallon per hour output.

However, some applications, such as those in agriculture or water treatment plants, call for higher outputs from more expensive metering pumps. However, a higher maximum flow rate puts the pump under additional strain and wear. High-output chemical dosing pumps will frequently have extra features to handle this and increase the performance of the pump's longevity.

The roller bearings and oil bath lubrication on the chemical metering pump ensure durability and wear resistance during extended use. A chemical metering pump with high output and stable features is often the best choice for demanding water treatment or greywater procedures.

Maximum Pressure Range

Large pressure ranges may logically correspond with high flow rates for flow instrumentation. However, this is only sometimes the case for metering pumps. Consider the example of pumping chemicals into a pressurized mainline at a water treatment plant. Although the water treatment metering pump's pressure range is relatively high, the flow rate required for chemical injection is quite low. This process may be done to achieve highly exact pH, chlorine, or other water quality parameter balancing.

Additionally, higher pressure ranges frequently necessitate additional characteristics for the pump's stability. For example, a bearing at each end of the pump's armature and shaft enables proper axial movement even when the pump operates at high-speed rates, such as 360 strokes per minute. This design guarantees chemical feed with great resolution across a wide range of applications.

Types of Chemical Metering Pumps

There are numerous types and sizes of metering pumps. A metering pump is ideal for the job, whether used in food processing applications, manufacturing operations, or anywhere else where a liquid needs to be pushed in consistent and accurate amounts. The four common metering pumps were created to handle various pressures, chemicals, and applications. However, by pumping action and mechanism, they differ:

Constant injection diaphragm pumps fill and empty their chambers using pistons, diaphragms, and valves at the inlet and output. When the piston is pumped, the chamber is filled, and a predetermined amount of chemical is injected at a predetermined rate, typically expressed as a percentage of the maximum flow rate. The dose rate can be changed in some pump models.

Additionally, using a diaphragm mechanism, a solenoid coil draws in the chemical and pulse-injects it in the case of diaphragm (pulse jet) pumps. The interval between pulses is the flow rate. Although it is less precise than a constant injection pump, the design is straightforward and low-cost.

A nozzle pump allows a specific amount of fluid to flow via an impeller with meshing. It only works with high-viscosity fluids that have a self-lubricating effect of reducing wear, making it less precise than a diaphragm pump. Low flow rates are not suitable for them since it is difficult to ensure precision.

Metering with peristaltic pumps is extremely precise. The fluid can pass through the flexible, bent tube, and a roller manipulated by an external robotic arm regulates the flow rate. Finally, the substance in the tube is pushed into the metering tube and the main fluid stream.

Method of Control

Operators have access to a wide variety of controls, similar to most flow instruments, depending on what is required for their application.

Manually controlling the stroke length is best for simpler applications when the process is very predictable and can be set and forgotten; there is no need for a flow controller. Other chemical metering pumps may require control of digital input. This is an improvement over "set it and forget it" pumps and is ideal for predictable applications. A flow controller can change the feed rate based on the pulse rate.

For more demanding applications where automation and control from a central place without walking to each pump is a top priority, 4-20mA analog input control is perfect. It allows for high-resolution chemical feed and utilizes the pump's whole operating range with a flow controller. Additionally useful for local governments who already have to keep track of numerous water quality indicators like pH and TDS.

Choosing the Right Chemical Metering Pumps Supplier

To make sure you have the most constructive outcome when purchasing Chemical Metering Pumps from a Chemical Metering Pumps Supplier, it is important to compare at least 5 or 6 Suppliers using our list of Chemical Metering Pumps manufacturers. Each Chemical Metering Pumps Manufacturer has a business profile page that highlights their areas of experience and capabilities and a contact form to directly communicate with the manufacturer for more information or request a quote. Review each Chemical Metering Pumps business website using our patented website previewer to get an idea of what each business specializes in, and then use our simple RFQ form to contact multiple Chemical Metering Pumps companies with the same message.