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Valve Data in GGDT

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Valve Data in GGDT

Unread postAuthor: demilus » Sun Feb 04, 2007 7:15 pm

Hey guys,
I've just downloaded GGDT and want to calculate for my cannon. The only thing I can't figure out is all the data for my valve. What I have is a 1" Watermaster sprinkler valve, modded with a blowgun. If anybody knows what I should plug in for all the variables in the program, I would REALLY appreciate it. Thanks in advance!
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Unread postAuthor: SpudBlaster15 » Sun Feb 04, 2007 7:22 pm

Valve type: Barrel sealing
Piston seat diameter: 1.2"
Piston diameter: 2"
Piston mass: .8oz
Flow efficiency: 23%
Pilot volume: 1.1 in3
Dead volume: 2.2 in3
Vent Diameter: .1" (.2" if you modded your blowgun)
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Unread postAuthor: boilingleadbath » Mon Feb 05, 2007 7:54 am

...Oh, don't just spoonfeed him information directly off the GGDT website.

...especialy if you can't spoonfeed it corectly - I believe that sprinklers are chamber sealing.

(on a different note, the "sprinkler valve" wiki artical now has this information)
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Unread postAuthor: schmanman » Mon Feb 05, 2007 8:12 am

yes, they are chamber sealing.
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Unread postAuthor: squeaks » Mon Feb 05, 2007 8:24 am

wait just a gosh darn flippen second. Sprinkler valves are not chamber sealing. They are barrel sealing. The only thing is that the GGDT assumes everything to be a piston and the performance estimate was made using a chamber sealing piston as kinda a reference dealio or something like that. Just don't get the two confused, it's not a chamber sealer, just modeled as one.
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Unread postAuthor: jrrdw » Mon Feb 05, 2007 8:46 am

OFF TOPIC KINDA: How can a sprinkler valve be barrel sealing or chamber sealing when in fact they are normally placed inbetween the chamber and barrel?
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Unread postAuthor: schmanman » Mon Feb 05, 2007 8:51 am

so are all valves. :wink:
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Unread postAuthor: jrrdw » Mon Feb 05, 2007 9:03 am

My piston is laced behind my storage chambers and barrel. My barrel runs clean through the 4 way i used. Is mine the only one? So my question stil stands -- How can a sprinkler valve be barrel sealing or chamber sealing when in fact they are normally placed inbetween the chamber and barrel?
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Unread postAuthor: Velocity » Mon Feb 05, 2007 10:30 am

In GGDT, I don't think using barrel-sealing or chamber-sealing for the type of valve really matters... it doesn't affect the performance, AFAIK.

Anyways, I too have been wondering for a while what makes a sprinkler valve chamber sealing?

On a somewhat unrelated topic, I once attached my chamber to the other side of the sprinkler valve, drilled an equalization port right through the center of the diaphragm, and plugged up the original equalization porton the outer part of the diaphragm.... does that make it barrel sealing?
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Unread postAuthor: SpudBlaster15 » Mon Feb 05, 2007 10:53 am

boilingleadbath wrote:I believe that sprinklers are chamber sealing.


The Orbit Watermaster valves are barrel sealers, take one apart and it becomes evident immediatley. I model them as such, and changes in configuration seem to reflect performance as it does in practice.
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