Alt-BEAM Archive
Message #01546
To:
From: Victor Snesarev vsn@eel.ufl.edu
Date: Tue, 16 Mar 1999 13:26:19 -0500
Subject: [alt-beam] Re: `Green Thumb'
Jean auBois wrote:
> I believe that the basic difficulty with this design is being missed here.
> Someone mentioned that it is very difficult to obtain very efficient pumps.
> Someone else mentioned that the only liquid valves that seem to be
> available are these hulking things that take 12 or 24 volts or the like.
How about a solenoid (not sure of power requirements, but ought to be less than
12 volts) pushing/pulling a plug of sorts? Maybe not quite a plug, but a slab of
plastic with a hole in it. Something like this:
water
|
v
| |
*******| |********
* | | *
#####| |###### *
[solenoid]=====##| |###### *
#####| |###### *
* | | *
*******| |********
| |
* indicate an enclosure
# indicate the slab
space between | is where water flows
In the picture the solenoid is not pushing the slab; water flow is interrupted.
Once the solenoid pushes the slab, the hole aligns with the water tube, and the
water flows.
This would require a water level above ground though.
Just my 2 cents.
Victor
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