Re: Looking for source recommendations; hydraulic flow control valve and waterproof junction box
- From: "N:dlzc D:aol T:com \(dlzc\)" <N: dlzc1 D:cox T:net@xxxxxxxxxx>
- Date: Wed, 29 Jun 2005 19:25:09 -0700
Dear davidd31415:
"davidd31415" <davidd31415@xxxxxxxxx> wrote in message
news:1120097546.683656.199000@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hi,
>
> I am hoping some readers of this group could help me source two
> items;
> if such questions are inappropriate here, please let me know.
> I have
> been web searching but if anyone has recommendations I would
> greatly
> appreciate it.
>
> The first thing I am looking for is a hydraulic flow control
> valve;
> something a step-up from the average back-yard water valve. I
> have
> heard of precision control valves that have knobs that can be
> locked
> down (similar to calipers). I'll consider these but am also
> interested
> in electrical control (I already have flow meters for feedback
> and am
> thinking about a closed loop). 4 flow valves with flow meters
> built in
> that can be programmed independently of any other hardware
> would be
> idea.
>
> These valves will pump water (10C warmer than room temperature)
> at
> rates between 5 and 15 gallons per minute.
I've only done such with hydraulic oil, so I can't help you here.
Plastomatic will make "metering valves", but as to automating
them... If you have a low pressure flow, you could probably use
an "I-to-P converter" and an "air pinch valve". Sounds pretty
embarrasing if you use them for shutoff, however. ;>)
> The second item I am looking for is a type of waterproof
> junction box
> that I have only been able to visualize thus far. I would like
> something with a clamshell-type design so that I could open it
> up, have
> a device placed in it with two wires extending out of the box,
> such
> that the box can be sealed. I am picturing two grommets, each
> cut in
> half, that split apart when the box is opened, creating a seal
> when the
> box is closed, but I am unsure if grommets will work decently
> in such
> conditions (?).
>
> The box will be exposed to dust, salt, and temperatures up to
> 80C.
> Quick removal is key. I am planning on attempting to build
> something
> like this myself if I am unable to find anything on the market.
Vynckier. Sold in the US by various big shops (Hubbell?). Best
to contact a local electrical supply house to see what is
available.
Split grommets are a lousy idea. Best to use cordage and a
sealing "strain relief" or "cord grip". Better sill to have the
"device" made with sufficient cordage built in.
David A. Smith
.
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