Monthly Archives: May 2014

Why Matching Accessories is All The Rage in the Pump World

You seldom use a metering pump by itself. You need many if not all of these accessories based upon your application:

Back Pressure Valve
Safety Relief Valve
Calibration ColumnĀ 
Inlet Strainer
Pressure GaugeĀ 
Pulsation DampenersĀ 
Injection Quills, etc.

Shopping around for these accessories could be time consuming and complex when you are trying to match the material of the wetted parts, connection sizes and pressure capabilities. Then when you finally have it all put together and something is not working as expected, the blame game begins. It’s the pump’s fault, no it is the valves’ fault, or may be the pressure gauge or calibration column is not accurate. Call all these vendors who conveniently blame every other component except theirs.

To solve this common problem AquFlow provides a complete set of matching accessories. Just ask for these accessories when you order the pump. So it all comes together and ready to use. In the unlikely event something does not work, you only need to call one company – AquFlow. Please call us and ask us to email you the brochure for these accessories.

By |May 27th, 2014|Metering Pumps Tips, Products, Pump Accessories|0 Comments

Too Many Choices – Which Pump is the One for Me?

Often times we are bombarded with choices in the market place which could get confusing. In metering pump world one faces a similar situation. You can get a metering pump for the same specifications in a wide range of prices. We did a recent study to find the range of prices could be mind boggling from USD 250 to USD 1,500. Which pump would be best suited for your application? How do you make the choice. Well we thought a simple comparison table below will help you navigate through the choices and arrive at the most suitable pump for your needs.

By |May 20th, 2014|Metering Pumps Tips, Products|0 Comments

Controlling the Flow Capacity of a Metering Pump

Since a metering pumps 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: In AquFlow hydraulic diaphragm metering pump all 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.

By |May 13th, 2014|Metering Pumps Tips|2 Comments

5 Things That Will Improve The Accuracy of a Metering Pump

Use a Back Pressure Valve to apply consistent pressure on the check valve balls so they close promptly and firmly.

Ensure there are no air bubbles trapped inside the pump chamber or anywhere else in the discharge line. The air bubble will compress and expand without pushing the liquid through. Remember gas / air is compressible while liquids are not compressible.

Use a degassing valve installed on the pump head when pumping a chemical such as sodium hypochlorite that can off-gas, in low flow rates. This is similar to introducing air bubbles in the line.

Ensure the suction line is clean and there is adequate NPSH. This is to prevent cavitations and consequent diaphragm failure.

Always use hydraulically balanced diaphragm metering pump. This is the only design which takes away the diaphragm stretching out of the equation as it balanced the process side pressure with the hydraulic pressure on the other side. It also ensures that the diaphragm lasts a very long time.

By |May 6th, 2014|Metering Pumps Tips, Products|0 Comments