New stamp project involving air and water valves
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Posts: 46,084
I could use some advice. Here is the start of my TO DO list:
1. Find a source for the appropriate valves
1a. Air valve for compressd air system, up to 90 PSI but I imagine it will
be lower pressure.
1b. Water valve for city water pressures.
1c. Water valve for low pressure gravity feed--ideally 1b and 1c would be
the same model valve.
2. Figure out appropriate method of actuating valves--depending on what kind of
voltage/current levels these valves need. I would like to stay away from relays
if possible.
The above really is the only part I am unsure of. The construction details and
software should be a snap. Can anybody give me some suggestions?
Thanks
--Dan
[noparse][[/noparse]Non-text portions of this message have been removed]
1. Find a source for the appropriate valves
1a. Air valve for compressd air system, up to 90 PSI but I imagine it will
be lower pressure.
1b. Water valve for city water pressures.
1c. Water valve for low pressure gravity feed--ideally 1b and 1c would be
the same model valve.
2. Figure out appropriate method of actuating valves--depending on what kind of
voltage/current levels these valves need. I would like to stay away from relays
if possible.
The above really is the only part I am unsure of. The construction details and
software should be a snap. Can anybody give me some suggestions?
Thanks
--Dan
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
don't know current draw. Price for a 3/4" brand X is about $10, 1" a little
higher. These should work for both pressure and gravity. Available from
Home Depot.
Jay Hocott
5900 Geyer Springs Road
Little Rock, ARkansas 72209-1842
Phone: (501) 568-9524, 580-4608
email: jhocott@s..., jay@h...
Web site: http://www.hocott.net
"Good is better than evil because it's nicer." Mammy Yokum
Original Message
From: "Dan" <dankgus@p...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, February 03, 2004 12:14 PM
Subject: [noparse][[/noparse]basicstamps] New stamp project involving air and water valves
> I could use some advice. Here is the start of my TO DO list:
>
> 1. Find a source for the appropriate valves
> 1a. Air valve for compressd air system, up to 90 PSI but I imagine it
will be lower pressure.
> 1b. Water valve for city water pressures.
> 1c. Water valve for low pressure gravity feed--ideally 1b and 1c would
be the same model valve.
>
> 2. Figure out appropriate method of actuating valves--depending on what
kind of voltage/current levels these valves need. I would like to stay away
from relays if possible.
>
> The above really is the only part I am unsure of. The construction
details and software should be a snap. Can anybody give me some
suggestions?
>
> Thanks
> --Dan
>
>
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
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>
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>
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> This message has been processed by Firetrust Benign.
them too! [noparse];)[/noparse]
Common irrigation valves are actuated with 24 VAC -- you'll have to use
a triac ciruit. Save yourself some trouble, and locate a solid-state
relay.
-- Jon Williams
-- Parallax
Original Message
From: Jay Website [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=K43NlkCiftWelP3PoWZD6lTj7Vcv99akTGXG-Kj6aeuV0HSGGwxojJWnl68dSlsQXSP3BFS5Tg]jay@h...[/url
Sent: Tuesday, February 03, 2004 7:49 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] New stamp project involving air and water
valves
Sprinkler valves should work, Rainbird or brand X. Values operate on
24v, don't know current draw. Price for a 3/4" brand X is about $10, 1"
a little higher. These should work for both pressure and gravity.
Available from Home Depot.
Jay Hocott
5900 Geyer Springs Road
Little Rock, ARkansas 72209-1842
Phone: (501) 568-9524, 580-4608
email: jhocott@s..., jay@h...
Web site: http://www.hocott.net
"Good is better than evil because it's nicer." Mammy
Yokum
Original Message
From: "Dan" <dankgus@p...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, February 03, 2004 12:14 PM
Subject: [noparse][[/noparse]basicstamps] New stamp project involving air and water valves
> I could use some advice. Here is the start of my TO DO list:
>
> 1. Find a source for the appropriate valves
> 1a. Air valve for compressd air system, up to 90 PSI but I imagine
> it
will be lower pressure.
> 1b. Water valve for city water pressures.
> 1c. Water valve for low pressure gravity feed--ideally 1b and 1c
> would
be the same model valve.
>
> 2. Figure out appropriate method of actuating valves--depending on
> what
kind of voltage/current levels these valves need. I would like to stay
away from relays if possible.
>
> The above really is the only part I am unsure of. The construction
details and software should be a snap. Can anybody give me some
suggestions?
>
> Thanks
> --Dan
that requires AC? Any ideas on a suitable air valve? I don't believe either
of you were suggesting that these valves would work for air also, please
let me know if you were.
Thanks,
--Dan
Original Message
From: "Jon Williams" <jwilliams@p...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, February 03, 2004 6:20 PM
Subject: RE: [noparse][[/noparse]basicstamps] New stamp project involving air and water valves
> Having spent a good deal of my life working for Toro, let me suggest
> them too! [noparse];)[/noparse]
>
> Common irrigation valves are actuated with 24 VAC -- you'll have to use
> a triac ciruit. Save yourself some trouble, and locate a solid-state
> relay.
>
> -- Jon Williams
> -- Parallax
>
>
>
Original Message
> From: Jay Website [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=OhheZzm7drkDCnGIw7-DWd_UD1qrYnfQULyoZsae0o9uNOwWR7IxPFRjmVXKUOrXNgLGFKUe]jay@h...[/url
> Sent: Tuesday, February 03, 2004 7:49 PM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] New stamp project involving air and water
> valves
>
>
> Sprinkler valves should work, Rainbird or brand X. Values operate on
> 24v, don't know current draw. Price for a 3/4" brand X is about $10, 1"
> a little higher. These should work for both pressure and gravity.
> Available from Home Depot.
>
>
> Jay Hocott
> 5900 Geyer Springs Road
> Little Rock, ARkansas 72209-1842
> Phone: (501) 568-9524, 580-4608
> email: jhocott@s..., jay@h...
> Web site: http://www.hocott.net
> "Good is better than evil because it's nicer." Mammy
> Yokum
>
>
>
Original Message
> From: "Dan" <dankgus@p...>
> To: <basicstamps@yahoogroups.com>
> Sent: Tuesday, February 03, 2004 12:14 PM
> Subject: [noparse][[/noparse]basicstamps] New stamp project involving air and water valves
>
>
> > I could use some advice. Here is the start of my TO DO list:
> >
> > 1. Find a source for the appropriate valves
> > 1a. Air valve for compressd air system, up to 90 PSI but I imagine
>
> > it
> will be lower pressure.
> > 1b. Water valve for city water pressures.
> > 1c. Water valve for low pressure gravity feed--ideally 1b and 1c
> > would
> be the same model valve.
> >
> > 2. Figure out appropriate method of actuating valves--depending on
> > what
> kind of voltage/current levels these valves need. I would like to stay
> away from relays if possible.
> >
> > The above really is the only part I am unsure of. The construction
> details and software should be a snap. Can anybody give me some
> suggestions?
> >
> > Thanks
> > --Dan
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
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>
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>
>
>
releases incoming water pressure from the top of the diaphragm that
closes the main stream of water. Most consumer water valves are not
suited for air.
-- Jon Williams
-- Parallax
Original Message
From: Dan [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=uRHWjEVXWuFzUcr--zDklbn9AIjh6U0dvfQoz9DPATWIsKJxSHK1_ddgxUt8wlf9qZS4V-WoIqMjfWE]dankgus@p...[/url
Sent: Tuesday, February 03, 2004 9:12 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] New stamp project involving air and water
valves
How are they actuated? Is their some kind of inductive circuit in their
that requires AC? Any ideas on a suitable air valve? I don't believe
either of you were suggesting that these valves would work for air
also, please let me know if you were.
Thanks,
--Dan
Original Message
From: "Jon Williams" <jwilliams@p...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, February 03, 2004 6:20 PM
Subject: RE: [noparse][[/noparse]basicstamps] New stamp project involving air and water
valves
> Having spent a good deal of my life working for Toro, let me suggest
> them too! [noparse];)[/noparse]
>
> Common irrigation valves are actuated with 24 VAC -- you'll have to
> use a triac ciruit. Save yourself some trouble, and locate a
> solid-state relay.
>
> -- Jon Williams
> -- Parallax
>
>
>
Original Message
> From: Jay Website [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=ZNzpsDY_1-gZSBCQ_3tkoM-mqKBJkzhPTFWcBd4ESCA2pVHw6j5sQI2X5ODTQodE_7uWTVKyzX2a]jay@h...[/url
> Sent: Tuesday, February 03, 2004 7:49 PM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] New stamp project involving air and water
> valves
>
>
> Sprinkler valves should work, Rainbird or brand X. Values operate on
> 24v, don't know current draw. Price for a 3/4" brand X is about $10,
> 1" a little higher. These should work for both pressure and gravity.
> Available from Home Depot.
>
>
> Jay Hocott
> 5900 Geyer Springs Road
> Little Rock, ARkansas 72209-1842
> Phone: (501) 568-9524, 580-4608
> email: jhocott@s..., jay@h...
> Web site: http://www.hocott.net
> "Good is better than evil because it's nicer." Mammy
> Yokum
>
>
>
Original Message
> From: "Dan" <dankgus@p...>
> To: <basicstamps@yahoogroups.com>
> Sent: Tuesday, February 03, 2004 12:14 PM
> Subject: [noparse][[/noparse]basicstamps] New stamp project involving air and water
valves
>
>
> > I could use some advice. Here is the start of my TO DO list:
> >
> > 1. Find a source for the appropriate valves
> > 1a. Air valve for compressd air system, up to 90 PSI but I
> > imagine
>
> > it
> will be lower pressure.
> > 1b. Water valve for city water pressures.
> > 1c. Water valve for low pressure gravity feed--ideally 1b and 1c
> > would
> be the same model valve.
> >
> > 2. Figure out appropriate method of actuating valves--depending on
> > what
> kind of voltage/current levels these valves need. I would like to
> stay away from relays if possible.
> >
> > The above really is the only part I am unsure of. The construction
> details and software should be a snap. Can anybody give me some
> suggestions?
> >
> > Thanks
> > --Dan
> I could use some advice. Here is the start of my TO DO list:
>
> 1. Find a source for the appropriate valves
> 1a. Air valve for compressd air system, up to 90 PSI but I
imagine it will be lower pressure.
> 1b. Water valve for city water pressures.
> 1c. Water valve for low pressure gravity feed--ideally 1b and
1c would be the same model valve.
>
> 2. Figure out appropriate method of actuating valves--depending on
what kind of voltage/current levels these valves need. I would like
to stay away from relays if possible.
>
> The above really is the only part I am unsure of. The construction
details and software should be a snap. Can anybody give me some
suggestions?
>
> Thanks
> --Dan
>
> I work small solenoid valves on a regular basis. 1/4'' npt ports
typically rated to 125-150 psig for water or air service. These are
industrial parts and are not cheap. $150 or so. Coil voltages are
120v AC and 24 vdc are available (maybe others) Cheaper sources
appliance parts dishwashers and clothes washing machines valves from
your local appliance repair place. All easily actuated via
transistors or mosfets or relays. good luck
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
I use ASCO valves all the time with stamps. They are industrial quality and
cost $100-$130 each. They are brass body valves and quite reliable. I use them
for Water, Natural Gas, Oxygen, Compressed Air, and Nitrogen.
I connect a solid state relay (SSR) to the stamp2 out put pin and drive the
SSR directly. Use an LED and 470 Ohm resistor for a pull-up. This will act as
the pull-up resistor, an indicator the circuit is active, and current limits
the output pin to 3 - 4 ma so you don't have to worry about Max pin output
current. Search Digikey for Grayhill Mini SSR units. I am away from my office or
I
would give you part numbers.
I use 120 VAC Solenoids, but this works for 24 VAC or DC units.
The advantage to the industrial units is they are rated for continuos use,
and less prone to failure. You need to think of the cost/damage if the unit
fails and lets the water/air run for a few hours/days unchecked due to a
failure.
Contact me if you need more info.
Hope this helps,
Alan Bradford
Plasma Technologies
www.plasmatechnologies.com
In a message dated 2/3/2004 8:42:26 PM Eastern Standard Time,
dankgus@p... writes:
I could use some advice. Here is the start of my TO DO list:
1. Find a source for the appropriate valves
1a. Air valve for compressd air system, up to 90 PSI but I imagine it
will be lower pressure.
1b. Water valve for city water pressures.
1c. Water valve for low pressure gravity feed--ideally 1b and 1c would be
the same model valve.
2. Figure out appropriate method of actuating valves--depending on what kind
of voltage/current levels these valves need. I would like to stay away from
relays if possible.
The above really is the only part I am unsure of. The construction details
and software should be a snap. Can anybody give me some suggestions?
Thanks
--Dan
[noparse][[/noparse]Non-text portions of this message have been removed]
interfacing.
jim http://www.geocities.com/jimforkin2003/
Original Message
From: gremlin8650 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=6LNiM_SAB-CJPf3vzSvPYak9_b8Kh2U0te8zU4oB52ZEZQE2-xF4N3ZpWXtV21VpI6j1QXs88ODYDP5KYw]gremlin8650@y...[/url
Sent: Tuesday, February 03, 2004 10:36 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: New stamp project involving air and water
valves
--- In basicstamps@yahoogroups.com, "Dan" <dankgus@p...> wrote:
> I could use some advice. Here is the start of my TO DO list:
>
> 1. Find a source for the appropriate valves
> 1a. Air valve for compressd air system, up to 90 PSI but I
imagine it will be lower pressure.
> 1b. Water valve for city water pressures.
> 1c. Water valve for low pressure gravity feed--ideally 1b and
1c would be the same model valve.
>
> 2. Figure out appropriate method of actuating valves--depending on
what kind of voltage/current levels these valves need. I would like
to stay away from relays if possible.
>
> The above really is the only part I am unsure of. The construction
details and software should be a snap. Can anybody give me some
suggestions?
>
> Thanks
> --Dan
>
> I work small solenoid valves on a regular basis. 1/4'' npt ports
typically rated to 125-150 psig for water or air service. These are
industrial parts and are not cheap. $150 or so. Coil voltages are
120v AC and 24 vdc are available (maybe others) Cheaper sources
appliance parts dishwashers and clothes washing machines valves from
your local appliance repair place. All easily actuated via
transistors or mosfets or relays. good luck
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
To UNSUBSCRIBE, just send mail to:
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Body of the message will be ignored.
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find a local rep. What about lawn sprinkler valves?
Jim Forkin <jjf@p...> wrote:check out this web site for methods to switch
valves using transistor
interfacing.
jim http://www.geocities.com/jimforkin2003/
Original Message
From: gremlin8650 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=jFyes99ourh4z9ilnLX7s-_ykg5A6GrFjluEyC1EHqCCTDZU7iO004UA4fUy_4i3t9YFvs1HLcM8Op6F]gremlin8650@y...[/url
Sent: Tuesday, February 03, 2004 10:36 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: New stamp project involving air and water
valves
--- In basicstamps@yahoogroups.com, "Dan" wrote:
> I could use some advice. Here is the start of my TO DO list:
>
> 1. Find a source for the appropriate valves
> 1a. Air valve for compressd air system, up to 90 PSI but I
imagine it will be lower pressure.
> 1b. Water valve for city water pressures.
> 1c. Water valve for low pressure gravity feed--ideally 1b and
1c would be the same model valve.
>
> 2. Figure out appropriate method of actuating valves--depending on
what kind of voltage/current levels these valves need. I would like
to stay away from relays if possible.
>
> The above really is the only part I am unsure of. The construction
details and software should be a snap. Can anybody give me some
suggestions?
>
> Thanks
> --Dan
>
> I work small solenoid valves on a regular basis. 1/4'' npt ports
typically rated to 125-150 psig for water or air service. These are
industrial parts and are not cheap. $150 or so. Coil voltages are
120v AC and 24 vdc are available (maybe others) Cheaper sources
appliance parts dishwashers and clothes washing machines valves from
your local appliance repair place. All easily actuated via
transistors or mosfets or relays. good luck
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and
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Do you Yahoo!?
Yahoo! Finance: Get your refund fast by filing online
[noparse][[/noparse]Non-text portions of this message have been removed]
The ASCO site will direct you to as local distributor, as well as a large
selection of valves. They are by no means the only supplier, but the only one I
have used for the past 10 years, due to the quality of the product.
I purchase them from a distributor in Worcester Mass. They have a large
selection and have many in stock for overnight delivery.
Washburn-Garfield Group
PO Box 947
100 Prescot Street
Worcester MA 01613 USA
508 753 7225
Thanks,
Alan Bradford
Plasma Technologies
In a message dated 2/5/2004 12:50:14 AM Eastern Standard Time,
gremlin8650@y... writes:
forgot to mention the site www.asco.com they don't sell direct, you'll need
to find a local rep. What about lawn sprinkler valves?
[noparse][[/noparse]Non-text portions of this message have been removed]
applications. (Their payback for donating a couple back when I was a
poor college student working on senior project.)
Precision Dynamics also has a nice selection in the $40-60 range. I
normally buy them hrough a distributor, but supposedly they just set up
an e-commerce section on their site. www.predyn.com
IIRC, the original poster didn't define any flow requirements. The size
and price of the valve will depend on this.
amg
On Thu, 5 Feb 2004 05:52:05 EST plasmastamp@a... writes:
> Hi,
> The ASCO site will direct you to as local distributor, as well as a
> large selection of valves. They are by no means the only supplier, but
the
> only one I have used for the past 10 years, due to the quality of the
product.
________________________________________________________________
The best thing to hit the Internet in years - Juno SpeedBand!
Surf the Web up to FIVE TIMES FASTER!
Only $14.95/ month - visit www.juno.com to sign up today!
After looking at the valves and seeing many of them have 1/4" and 3/8" ports
I realize flow rates are a concern. I was imagining 1" size valves but that
is just my mind creating the ideal part. Gravity feeding in a 1" valve
would still have decent flow but 3/8" I am not so sure of. Basically I am
using gravity to drain a tub full of a solution into a reservoir, spray off
a part in the now empty tub with fresh water-which will drain to sewer, and
then use compressed air from a compressor to pressurize the reservoir and
push the solution from the reservoir back into the tub. The reason for
using air pressure is because I then do not need a pump. In my experience,
pumps are great but they eventually fail, so the air pressure eliminates the
mechanical failure prone pump. I don't know the size of the tub and
reservoir yet but I am guessing it will be no more than 10 or maybe 15
gallons-maybe even as little as 5 gallons.
You guys have been great, I appreciate every bit of input and I still
appreciate any tips you might have.
Thanks,
--Dan
Original Message
From: "amg amg" <controlsdude2000@j...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, February 06, 2004 11:50 AM
Subject: Re: [noparse][[/noparse]basicstamps] Re: New stamp project involving air and water
valves
> Asco valves are indeed nice. I frequently use them in commercial
> applications. (Their payback for donating a couple back when I was a
> poor college student working on senior project.)
>
> Precision Dynamics also has a nice selection in the $40-60 range. I
> normally buy them hrough a distributor, but supposedly they just set up
> an e-commerce section on their site. www.predyn.com
>
> IIRC, the original poster didn't define any flow requirements. The size
> and price of the valve will depend on this.
>
> amg
http://www.predyne.com/
Thanks,
--Dan
Original Message
From: "amg amg" <controlsdude2000@j...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, February 06, 2004 11:50 AM
Subject: Re: [noparse][[/noparse]basicstamps] Re: New stamp project involving air and water
valves
> Precision Dynamics also has a nice selection in the $40-60 range. I
> normally buy them hrough a distributor, but supposedly they just set up
> an e-commerce section on their site. www.predyn.com
other solutions with potentially corressive soloutions. I'm using a 12v dc
pump from a motorhome. Works great, flow is quite good. Just a thought as
an alternative3.
Jay Hocott
"Good is better than evil
because it's nicer." Mammy Yokum
Original Message
From: "Dan" <dankgus@p...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, February 06, 2004 2:17 PM
Subject: Re: [noparse][[/noparse]basicstamps] Re: New stamp project involving air and water
valves
> I didn't mention flow rates because I haven't actually calculated any.
> After looking at the valves and seeing many of them have 1/4" and 3/8"
ports
> I realize flow rates are a concern. I was imagining 1" size valves but
that
> is just my mind creating the ideal part. Gravity feeding in a 1" valve
> would still have decent flow but 3/8" I am not so sure of. Basically I am
> using gravity to drain a tub full of a solution into a reservoir, spray
off
> a part in the now empty tub with fresh water-which will drain to sewer,
and
> then use compressed air from a compressor to pressurize the reservoir and
> push the solution from the reservoir back into the tub. The reason for
> using air pressure is because I then do not need a pump. In my
experience,
> pumps are great but they eventually fail, so the air pressure eliminates
the
> mechanical failure prone pump. I don't know the size of the tub and
> reservoir yet but I am guessing it will be no more than 10 or maybe 15
> gallons-maybe even as little as 5 gallons.
>
> You guys have been great, I appreciate every bit of input and I still
> appreciate any tips you might have.
>
> Thanks,
> --Dan
>
>
Original Message
> From: "amg amg" <controlsdude2000@j...>
> To: <basicstamps@yahoogroups.com>
> Sent: Friday, February 06, 2004 11:50 AM
> Subject: Re: [noparse][[/noparse]basicstamps] Re: New stamp project involving air and water
> valves
>
>
> > Asco valves are indeed nice. I frequently use them in commercial
> > applications. (Their payback for donating a couple back when I was a
> > poor college student working on senior project.)
> >
> > Precision Dynamics also has a nice selection in the $40-60 range. I
> > normally buy them hrough a distributor, but supposedly they just set up
> > an e-commerce section on their site. www.predyn.com
> >
> > IIRC, the original poster didn't define any flow requirements. The size
> > and price of the valve will depend on this.
> >
> > amg
>
>
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The bigger the valve the more $ it cost. The 3/8" and 1" sizes are for the
pipe to thread into it. You need to check the specifications to see what size
the actual opening of the valve is. It is much smaller than the pipe size.
You will have to determine how fast the tank drains Vs how much you want to
spend on valves. If you need to dump the tank quickly, then you will need to
look into a motorized ball valve. These have a ball that blocks the flow. When
opened, by rotation, the opening is the pipe size. I have not used motorized
ones, but hand opening ones work good. Just more $$$.
This is an excellent application for a stamp controller, as the speed is not
high, and the reliability is good. I use stamps in this type of industrial
application all the time. I use 120 VAC solenoids for most of my projects. I
need
to use a SSR to control it so by using 120 VAC units I can eliminate the need
for a 24 VDC power supply.
You will want to use good quality sensors as overflow problems could be
expensive.
I do not know what type of solution you use, but make sure it is not
reactive, or corrosive to Brass. If so then you may need to use Stainless Steel
valves. Again more $$$.
Hope this helps,
Alan Bradford
Plasma Technologies
www.plasmatechnologies.com
These are choices you will need to make.
In a message dated 2/6/2004 3:23:26 PM Eastern Standard Time,
dankgus@p... writes:
I didn't mention flow rates because I haven't actually calculated any.
After looking at the valves and seeing many of them have 1/4" and 3/8" ports
I realize flow rates are a concern. I was imagining 1" size valves but that
is just my mind creating the ideal part. Gravity feeding in a 1" valve
would still have decent flow but 3/8" I am not so sure of. Basically I am
using gravity to drain a tub full of a solution into a reservoir, spray off
a part in the now empty tub with fresh water-which will drain to sewer, and
then use compressed air from a compressor to pressurize the reservoir and
push the solution from the reservoir back into the tub. The reason for
using air pressure is because I then do not need a pump. In my experience,
pumps are great but they eventually fail, so the air pressure eliminates the
mechanical failure prone pump. I don't know the size of the tub and
reservoir yet but I am guessing it will be no more than 10 or maybe 15
gallons-maybe even as little as 5 gallons.
You guys have been great, I appreciate every bit of input and I still
appreciate any tips you might have.
Thanks,
--Dan
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