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John Carberry
Participant

Join Date: Jul 2009
Posts: 3

Low Volume Variable Flow Positive Displacement Pump

07/13/2009 11:12 PM

I am looking for a supplier of of a reasonable cost pump that can provide the following:

Positive displacement. Discharge pressure up to 150 psig

Controllable flow in the milli-liters/hour range without needing to use a flow meter and recycle loop. Therefor, probably by controlling the motor speed.

Handle low amounts (a few percent or less) suspended solids

120 VAC power supply

Piston pumps with check valves fail due to the solids. I have found several vane pumps and gear pumps that would do the job but they require an accompanying converter to DC power supply. That will probably not be acceptable unless it is fully integrated into a single unit. (I really need a highly robust, fairly fool-proof unit.)

Thanks to anyone who can contribute the name of a pump and/or supplier.
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Pathfinder Tags: handle low solids low volume pump variable flow control
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PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: Low Volume variable flow Positive Displacement Pump

07/14/2009 3:29 AM

Look at dosing pumps, used to dose chemicals routinely into streams in water treatment applications. Gee, Milton Roy and Bran & Luebbe spring to mind (usual disclaimer).

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Nilesh
Commentator
India - Member - New Member

Join Date: Aug 2008
Posts: 61
Good Answers: 1
#2
In reply to #1

Re: Low Volume variable flow Positive Displacement Pump

07/15/2009 12:55 AM

I recommand to use Diaphragm metering pumps for Explosive mixer / Hydrocarbon application (supplier as specified above). You can also check with Milton roy / OMG for small size metering pumps.

If application is not for explosive fluid, you can take Plunger pumps also.

For capacity Control - You can use either the following combination (In addition to Motor + VSD panel )

1. Manual - Stroke adjustment.

2. I2P Converter

3. Serve motor stroke control signal - Electonic 4-20 mA

With regards,

Nilesh.
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realist
Associate

Join Date: Jul 2009
Posts: 32
#3

Re: Low Volume Variable Flow Positive Displacement Pump

07/15/2009 9:15 AM

Consider a peristaltic (hose) pump with a VFD. Some will provide the 150 psi pressure, most are very rugged and accurate and will handle solids.
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John Carberry
Participant

Join Date: Jul 2009
Posts: 3
#4
In reply to #3

Re: Low Volume Variable Flow Positive Displacement Pump

07/15/2009 9:24 AM

Good suggestion. Do they not require DC power supply to achieve variable motor speed that will give the variable flow control? Do you know a good vendor?

Thank you
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realist
Associate

Join Date: Jul 2009
Posts: 32
#5
In reply to #4

Re: Low Volume Variable Flow Positive Displacement Pump

07/15/2009 11:26 AM

Cole-Parmer, Verderflex, Watson-Marlow for a few vendors. Variable speed drive would probably be less than $500 but usually will be supplied with the smaller pumps.
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John Carberry
Participant

Join Date: Jul 2009
Posts: 3
#6
In reply to #5

Re: Low Volume Variable Flow Positive Displacement Pump

07/15/2009 1:22 PM

Excellent

Thanks
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Anonymous Poster
#7

Re: Low Volume Variable Flow Positive Displacement Pump

07/15/2009 1:52 PM

My recommendation is to look at a Wanner Hydra-Cell pump. They are designed for high pressure and solids handling. Here is their website: http://www.hydra-cell.com/

Regards, Bob Sygiel

R.F. MacDonald Co.

Hayward, CA
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Users who posted comments:

Anonymous Poster (1); John Carberry (2); Nilesh (1); PWSlack (1); realist (2)

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