I did something similar once but used a length of tube with two solenoids on
it.

When bottom one was closed and top one was open, the liquid filled to a
known volume (as determined by the diameter and length of the tube). When
the top one was closed and bottom one opened the measured liquid would be
dispensed into the container.

This was used for filling up those screen wipe type containers with cloth
inside for medical purposes and worked for years.

Dom
----- Original Message -----
From: "John Waters" <john_fm_waters@HOTMAIL.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, March 18, 2004 3:31 PM
Subject: [EE]: d.c. water pump or pump head, where to buy?


> Hi All,
>
> I'm doing a project that needs dispersing regularly a non-corrosive liquid
> to a tank in small amount (20 - 30 ml each time). I need a pump that could
> run on d.c. so that my timer circuit can control its operation, an
> alternative is, I buy a pump head and install it to a d.c. motor myself.
> Does anyone know if there is any low cost d.c. pump or pump head available
> in the market?
>
> Thanks in advance!
>
> John
>
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