Walchem Chemical Metering Pumps

Walchem offers diaphragm metering pumps for every flow rate, pressure and chemical your application requires. Our E Series chemical metering pumps are powered by advanced microprocessor-based electronics and superior mechanical design. These E Series pumps, with capacities up to 20 GPH (76 g/h) and pressures to 290 psi (20 bar) are backed with a comprehensive 2-year warranty that covers the entire pump, including the liquid end and diaphragm. IX series pumps feature intuitive control with capacities up to 80 GPH and pressures to up to 247 PSI. The LK series of pumps can produce high flow rates up to 856 GPH and pressures up to 220 PSI.

All of these chemical metering pumps will fit most industrial, municipal, agricultural or water or wastewater application requirement. If you have any questions regarding our chemical feed pumps, feel free to get in contact with us at 508-429-1110, and we will be happy to assist. Walchem metering pumps are some of the highest-quality chemical dosing pumps on the market today!

How to Choose the Right Metering Pump for Your Applications?

Here are some factors to consider which may be useful when choosing a metering pump suitable for your application.

Output Range
This is flow rate, which means the amount of liquid dispensed in a specified amount of time or the volume per unit time. This is expressed in Gallons per hour (GPH) or liters per hour (LPH). The number of hours depend on the application requirement. In case of certain applications, where the dosing is in small amounts or needs to be calculated per minute, the output range may be expressed in ml/min.

System Pressures
System is the amount of pressure within the application that the pump must overcome. This pressure is measured in the pipe with a help of a gauge. Viscous fluids add to this pressure. Hence, it is crucial to choose a chemical dosing pump that can withstand the pressure changes and buildup. The changes in the type and consistency of the fluid in the pump may create uncertainties as chemical feed pumps are sensitive to system pressure.  

Chemistry to be Pumped
It is essential to know the physical and chemical properties of the fluid that is being pumped. Based on this information, one can determine the material of construction for the pump liquid end. The material chosen must be able to withstand properties such as acidity, abrasion, and more. Many people only refer the Material Safety Data Sheets (MSDS), which may not serve the purpose. They must also refer the product data sheets, corrosion guides, and manufacturer’s user manuals to study these properties in detail.

Electrical Connections
The main drive power for these pumps is an AC motor operating at a set speed. Our chemical metering pumps operate at voltages of 115VAC and 230 VAX at a frequency of 50-60 Hz. In case of a 3-phase distribution of power, the voltage utilized is 230 or 460 VAC.

Method of Control
The method of control may be manual or electronic. There are many control features of our metering pumps. They are equipped with stop, pulse, and pre-stop inputs, such as STOP, PosiFlow and AUX. The analog input control is between 0 and 20mA, and may be fixed or scalable, and is proportional to pump flow. The digital pulse input decides the multiply up and divide down capability. The simple yet versatile programmable timer control can be set during each cycles, such as daily or weekly. Alarm outputs are available in some types such as EWN and IX series chemical metering pumps.

Applications of Chemical Metering Pumps

Here are some application areas of our chemical metering pumps.

• Neutralization
• Water & Waste Water Treatment
• Polymer Feed
• Fracture Water Treatment
• Enzyme Feed for Food Processing
• Industrial Laundry
• Chemical Processing