Path: utzoo!attcan!uunet!lll-winken!ames!ncar!stout!cook
From: cook@stout.ucar.edu (Forrest Cook)
Newsgroups: sci.electronics
Subject: Re: Finding an electrically-controlled valve?
Keywords: valves, plumbing, motorized valves
Message-ID: <1235@ncar.ucar.edu>
Date: 13 Jan 89 21:22:43 GMT
References: <1404@accelerator.eng.ohio-state.edu> <2925@kitty.UUCP>
Sender: news@ncar.ucar.edu
Reply-To: cook@stout.UCAR.EDU (Forrest Cook)
Organization: Field Observing Facility, NCAR, Boulder, CO
Lines: 25

In article <2925@kitty.UUCP> larry@kitty.UUCP (Larry Lippman) writes:
>In article <1404@accelerator.eng.ohio-state.edu>, borgstrm@icarus.eng.ohio-state.edu (Tom Borgstrom) writes:
>> I'm trying to find a source of motorized valves for use in an residential
>> water system. The valves would be used to control hot and cold water to a
>> faucet or shower and thus can't be the solenoid type. I would like an
...
>Consider getting a hot/cold water control valve for a washing machine or
>dishwasher.
...
	Try a Water DAC:

If you wanted a variable temperature/pressure system, say 4 bits, you could use
a 1 to 4 Y manifold, 4 solenoid valves, each with its own pressure setting
manual valve or flow restrictor, and a 4 to 1 Y manifold combiner and make an
H20 D to A converter with 16 settings.
The manual valves/flow restrictors could be set for 1/2, 1/4, 1/8, and 1/16
of full pressure, and the solenoids could be driven via solid state relays for
a logic level interface.  You could use 4 bits for hot, and 4 for cold and
control the whole gizmo with one byte.  Some kind of temperature sensor would
be nice to complete the loop so that you could get better regulation.

 ^	Forrest Cook   (The preceding comments were my Opinions)	 ^
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