Programmable flow water delivery pump

[asimpson]

I wish to source a programmable flowrate potable water pump for a product. I wish the flowrate to remain resonable constant irrespective of delivery pressure.

Flow rate: 0-300 l/hr (0-1.3 gal/min)
Delivery pressure: 0-8 bar (0-116 psi)
Temperature: 5-50 C (40-150F)

I am looking at a rotary vane or gear pump with variable speed drive however the flow gange is limited, 80-300 l/hr or 15-200 l/hr. I am hoping to control flow down to 10 l/hr

http://www.fluidotech.it/Contents/D...vane pumps-motor units TMFR 30-200 series.pdf

I have not found many other similar suppliers.

Can anybody recommend alternative method or other suppliers?

Many thanks

 

[btrueblood]

Alternative method: a positive displacement pump (vane, gear, plunger) and a stepper motor, with suitable controller and some programming skills. Cole Parmer probably has something like what you described, but at a pretty high markup.

 

[LittleInch]

If your flow range in 10-300, you will search long and hard to discover a single pump able to perform this duty as this flow range is simply too large for the vast majority of pumps. Therefore you probably need two or perhaps three units as parallel pumps. Maybe what you need is a 10-100 and then your 80-300 unit to allow some overlap before you change duty. Variable speed is good, but often struggles at the low end to provide enough torque and can sometimes stall or become quite variable in flowrate.

If you want fixed flow regardless of pressure you need some sort of pd pump.

Another alternative is to take your unit as found and then introduce a bypass / return unit, but how you control it will need some sort of flow control on both the pump outlet and the return loop.

If it was me I'd go for two pumps.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[Artisi]

Have you looked at peristaltic pumps (hose pumps) with variable speed - well worth considering and discussing with the supplier / manufacturer.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)