flow divider/combiner

  • Thread starter Jeffrey D. Brandt
  • Start date
J

Thread Starter

Jeffrey D. Brandt

Off topic, perhaps but, somebody knows the answer..

Is there a source (U.S.) for a device that would mechanically
proportion two liquid flows?

Specs:
Fluid 1: Water, 60GPM
Fluid 2: Soap, 10GPM

The divider/proportioner should always maintain a 6:1 ratio, regardless
of flow rate.

Any ideas?

Jeff Brandt
[email protected]
 
J

Johan Bengtsson

I don't know of such a device, but some ideas about how one could be built would be:

Use 2 volumetric flow sensors and mecanically connect them. Some of these sensors use the principle that for a certain amount of liquid to pass an axis have to move exatly one complete turn. it two of these devices are mecanically connected they have to move syncronised and thereby let the fixed relations (due to gear and difference in size) pass of each liquid.

Talk to someone building volumetric flow sensors about this if you don't find any other device.


/Johan Bengtsson

----------------------------------------
P&L, the Academy of Automation
Box 252, S-281 23 H{ssleholm SWEDEN
Tel: +46 451 49 460, Fax: +46 451 89 833
E-mail: [email protected]
Internet: http://www.pol.se/
 
V

Vitor Finkel

At 09:02 14/12/99 -0500, Johan Bengtsson wrote:
>
>I don't know of such a device, but some ideas about how one could
>be built would be:
>
>Use 2 volumetric flow sensors and mecanically connect them.
>Some of these sensors use the principle that for a certain amount
>of liquid to pass an axis have to move exatly one complete turn.
>it two of these devices are mecanically connected they have to
>move syncronised and thereby let the fixed relations (due to gear
>and difference in size) pass of each liquid.
>
>Talk to someone building volumetric flow sensors about this if you
>don't find any other device.

-------message separator---------

Those device are known in the industrial world as Positive Displacement
Flowmeters and/or Positive Displacement Pumps. There are so many different
phisical construction types and manufacturers, you may look for
the names/brand": Oval, Brooks, American Meter, Smith Meters, DEA, Dwyer,
EMCO, Meriam, SeaMetrics, Blue-White and there should be so many others.


Vitor Finkel [email protected]
P.O. Box 16061 tel (+55) 21 285-5641
22222.970 Rio de Janeiro Brazil fax (+55) 21 205-3339
 
W
The H. E. Anderson Co. of Muskogee, OK (918-687-4426) used to make a device
called the "Anderson Ratio Feeder" which did exactly that. I don't know if
they still make it or not. It was widely used in remote locations to
proportionally feed chlorine solutions into water because it was totally
mechanical.

Walt Boyes

------------------Walt Boyes----------------
SeaMetrics Inc. Flow Meters and Controls
P. O. Box 1589 Kent, WA 98035 USA
253-872-0284 voice 253-872-0285 fax
mailto:[email protected]
http://www.seametrics.com
------------------------------------------
 
B
You might consider talking to any competent fluid power engineer. Flow dividers/combiners are a standard tool in their bag of tricks. As you might
guess, there are plenty of traps and trick involved in their successful implementation

Bill M
 
P

Phillip O'Meley

You didn't mention what material you are using so you may try a flow divider, available from any of the hydraulic supply companies, (Commercial
Hydraulics)
Phill
[email protected]
 
A
You could use two mechanical flow control valves from a company like Griswald.

You would set each valve at the required flow rate. each valve would then allow the required gpm through over a wide range or pressures. the valves cost about 50 to 200 bucks each.
 
That problem is so common that, yes there was devices designed to this end . My recollection does not work. In practice in the industries we had 'Ratio Controller'. Very simple to implement: two flow devices, two valves, two controllers.
One of each sized and installed in each component line. One was called 'Master' the other one 'Slave'. In the master loop, an ordinary controller. In the slave loop the ratio controller
Then two adjustments:
1. set point of the master for the desired volume (controlled within its on loop)
2. same set point feeding also the set point of the slave but via the ratio input (which was simply a dividing bridge c/w appropriate signal rescale)
The flow is now set point adjustable and regulated and the ratio set as required.

Today, the metering pumps do valve and controller
job all in one element. You may then have only two pumps (appropriatly sized) and set each one
to the proportion of the mixture.
I suspect that the accuracy via metering pumps be equal or better than the ratio controller.
Ratio control is no problem with actual numerical
systems and may be implemented by the end user in
case it would no be directly available from supplier.
 
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