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Message |
davidd31415
science forum beginner
Joined: 30 Jun 2005
Posts: 8
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 Posted: Thu Jun 30, 2005 12:12 am Post subject:
Looking for source recommendations; hydraulic flow control valve and waterproof junction box
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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.
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.
Thanks much,
David. |
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N:dlzc D:aol T:com (dlzc)
science forum Guru
Joined: 25 Mar 2005
Posts: 2835
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| Posted: Thu Jun 30, 2005 12:25 am Post subject:
Re: Looking for source recommendations; hydraulic flow control valve and waterproof junction box
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Dear davidd31415:
"davidd31415" <davidd31415@yahoo.com> wrote in message
news:1120097546.683656.199000@g44g2000cwa.googlegroups.com...
| Quote: | 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. ;>)
| Quote: | 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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Lance
science forum beginner
Joined: 30 Apr 2005
Posts: 25
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| Posted: Thu Jun 30, 2005 1:54 am Post subject:
Re: Looking for source recommendations; hydraulic flow control valve and waterproof junction box
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davidd31415 thought carefully and wrote on 6/29/2005 7:12 PM:
<snip>
| Quote: |
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.
Thanks much,
David.
|
When searching for the box try NEMA 4 or 4X as search terms. NEMA 4
electrical boxes are designed to keep their contents dry when exposed to
a jet of water. 4X adds requirements for corrosion resistance.
Personally, I would use bulkhead electrical connectors to ensure a
leak-proof seal instead of running a couple wires through a grommet.
Lance
***** |
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davidd31415
science forum beginner
Joined: 30 Jun 2005
Posts: 8
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| Posted: Thu Jun 30, 2005 2:56 am Post subject:
Re: Looking for source recommendations; hydraulic flow control valve and waterproof junction box
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Changing electrical connectors is a problem, unfortunately; I'd like to
use such a box to protect the electrical connectors of devices being
tested. The original connectors must be used at various times in the
test, and if the box can not be removed and placed over another
connector in less than a minute or so the current "place the connector
in a plastic bag and cable-tie & tape it together as to keep out as
much water as possible" method will need to stay in place.
As it sounds that the split-grommet idea is a terrible one, I guess
it's back to the drawing board.
Lance wrote:
| Quote: | davidd31415 thought carefully and wrote on 6/29/2005 7:12 PM:
snip
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.
Thanks much,
David.
When searching for the box try NEMA 4 or 4X as search terms. NEMA 4
electrical boxes are designed to keep their contents dry when exposed to
a jet of water. 4X adds requirements for corrosion resistance.
Personally, I would use bulkhead electrical connectors to ensure a
leak-proof seal instead of running a couple wires through a grommet.
Lance
***** |
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Anthony
science forum beginner
Joined: 13 May 2005
Posts: 45
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| Posted: Thu Jun 30, 2005 4:02 am Post subject:
Re: Looking for source recommendations; hydraulic flow control valve and waterproof junction box
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"davidd31415" <davidd31415@yahoo.com> wrote in
news:1120097546.683656.199000@g44g2000cwa.googlegroups.com:
Check with Vickers or Parker to see if they offer something for water.
I would suggest using Pheonix Contact sealed quick-connect blocks or sealed
Amp connectors ( IP67 rated ) for your box. This will not only fix your
need for quick change-out of wiring, but will seal at the same time.
--
Anthony
You can't 'idiot proof' anything....every time you try, they just make
better idiots.
Remove sp to reply via email
http://www.machines-cnc.net:81/ |
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davidd31415
science forum beginner
Joined: 30 Jun 2005
Posts: 8
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| Posted: Thu Jun 30, 2005 4:41 pm Post subject:
Re: Looking for source recommendations; hydraulic flow control valve and waterproof junction box
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Are you suggesting new connectors for each device? I have too many
parts to justify spending the time to change the connectors on each
one, plus the original connectors are needed at various times
(unfortunately). I need to be able to get the current connector (not
waterproof) into the box, and then seal the box around the wire
(without depinning the connector).
Anthony wrote:
| Quote: | "davidd31415" <davidd31415@yahoo.com> wrote in
news:1120097546.683656.199000@g44g2000cwa.googlegroups.com:
Check with Vickers or Parker to see if they offer something for water.
I would suggest using Pheonix Contact sealed quick-connect blocks or sealed
Amp connectors ( IP67 rated ) for your box. This will not only fix your
need for quick change-out of wiring, but will seal at the same time.
--
Anthony
You can't 'idiot proof' anything....every time you try, they just make
better idiots.
Remove sp to reply via email
http://www.machines-cnc.net:81/ |
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Jonathan Barnes
science forum addict
Joined: 04 May 2005
Posts: 73
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| Posted: Thu Jun 30, 2005 6:49 pm Post subject:
Re: Looking for source recommendations; hydraulic flow control valve and waterproof junction box
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"davidd31415" <davidd31415@yahoo.com> wrote in message
news:1120097546.683656.199000@g44g2000cwa.googlegroups.com...
| Quote: | 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.
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.
Thanks much,
David.
First the valves, would the diversion valves used in some domestic combined |
central heating / hot water systems be suitable ?
with regard sealing a wire that must be removable, this will be difficult.
A possible solution might be to have the equipment on a very short lead,
and build a sealed socket into the box side.
--
Jonathan
Barnes's theorem; for every foolproof device
there is a fool greater than the proof.
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