Monthly Archives: December 2016


Controlling the Flow Capacity of a Metering Pump

Since a metering pump is usually a positive displacement pump there are two possible ways of controlling the flow capacity. The first one is by adjusting the volume of liquid displaced per stroke of the pump and the second is by adjusting the speed of the strokes.
I. Stroke Length – control the displacement volume per stroke
II. Speed of Strokes per minute

1. Stroke Length – Manual: All AquFlow hydraulic diaphragm metering pumps come with a standard manual knob to adjust the volume from 100% down to 5% or 10% without compromising the accuracy. On AquFlow pumps you can adjust the manual knob even while the pump is running unlike some other pumps where you have to turn the pump off before adjustment.
2. Stroke Length – Automatic ECCA: The stroke length can also be controlled automatically with an electronic signal (usually 4-20mA) coming from a source such as SCADA, PLC or a computer.
3. Stroke Speed / Frequency – VFD: We can adjust the speed of the pump by connecting a VFD to run the motor. Here again you can achieve very low flows by reducing the speed of the pump.
4. Dual Axis Control – Stroke Length And Stroke Speed Combined: Here we get the ultimate in control to the finest resolution by combining both the Stroke Length as well as the Stroke Speed. This can e done with a manual adjuster or automatic with electronic signal.

Introducing: Chem-Bot by AquFlow

Chem-Bot System

Self Regulating Proportional Chemical Injection System.
Water quality and its consistency is critical in many industries and applications. Very often the water is chemically treated to improve its quality for a given application. This treatment depends upon maintaining an exact proportion between the volume of the water being treated and the volume of chemical being used for the treatment. Variations in the volume of water with constant chemical flow such as in an irrigation pipeline where fertilizer is being added could show up as patches of green and brown.

▪ Chem-Bot is the solution to automatically and intelligently change the volume of the chemical in proportion to the flow in the pipe
▪ .It works by monitoring the flow in the irrigation water line sending a signal into the controller when flow changes
▪ The controller then sends a corresponding signal to the VFD
▪ VFD increases or decreases the chemical flow to keep desired ratio
▪ All of this without any human intervention and round the clock
▪ This system is designed around simplicity and dependability