Dump Valve Positioning

Leg of Salmon · May 25th, 2008, 11:43 PM

The suit I am using now has the autodump positioned over my bicep. This is a sub optimal position for horizontal ascents.

I am thinking of having a dump fitted between bicep and tricep and a little closer to the elbow than normal. When horizontal this should be in the correct place. Am I right?

I have read some concerns that this position wouldn't allow the suit to hold any air at all. But surely the suit will only dump when the pressure inside is greater than the pressure of the surrounding water. What do you think?

TobyFish · May 26th, 2008, 12:12 AM

Quote: (Originally Posted by Leg of Salmon)

The suit I am using now has the autodump positioned over my bicep. This is a sub optimal position for horizontal ascents.

I am thinking of having a dump fitted between bicep and tricep and a little closer to the elbow than normal. When horizontal this should be in the correct place. Am I right?

I have read some concerns that this position wouldn't allow the suit to hold any air at all. But surely the suit will only dump when the pressure inside is greater than the pressure of the surrounding water. What do you think?

I think the pressure inside the suit is always equal to the pressure outside under diving conditions and that a valve in the fully or nearly fully opened state will dump whenever it is above an air-bubble

GLOC · May 26th, 2008, 12:13 AM

There was a thread on this about 2-3 weeks ago. Have a search.

A picture says a thousand words, post one and we can see what you mean.

Regards

Leg of Salmon · May 26th, 2008, 12:36 AM

Thanks , I have had a read of that thread just now.

So, basically, if the dump valve is the highest point in the suit, and it is open fully, it will allow all of the gas to escape.

This wouldn't be ideal.

So I need a position where it is not the highest point unless I want it to be, and I can make it the highest point easily. Towards the tricep on the right arm might be a good place.

**zuckerkringel** · May 26th, 2008, 09:40 AM

I did it here:

Drysuit valve position

Best, Hubsi

GLOC · May 26th, 2008, 10:32 AM

Quote: (Originally Posted by Leg of Salmon)

Thanks , I have had a read of that thread just now.

So, basically, if the dump valve is the highest point in the suit, and it is open fully, it will allow all of the gas to escape.

This wouldn't be ideal.

So I need a position where it is not the highest point unless I want it to be, and I can make it the highest point easily. Towards the tricep on the right arm might be a good place.

Most people have it on the left, for which reason I do not know but I do know that if you ever get to scootering, dumping from the right arm and scootering will be something very interesting to watch

robhass · May 26th, 2008, 11:06 AM

Quote: (Originally Posted by GLOC)

Most people have it on the left, for which reason I do not know but I do know that if you ever get to scootering, dumping from the right arm and scootering will be something very interesting to watch

Last week I watched movie with Casey McKinaly scootering in the cave. He has dump-valve on their right arm, and I cannot see any problems with dumping air during scootering.

Movie is here:
http://www.hogarthian.pl/galerie/pac...nnie_casey.mov

rob

GLOC · May 26th, 2008, 11:24 AM

Quote: (Originally Posted by robhass)

Last week I watched movie with Casey McKinaly scootering in the cave. He has dump-valve on their right arm, and I cannot see any problems with dumping air during scootering.

Movie is here:
http://www.hogarthian.pl/galerie/pac...nnie_casey.mov

rob

Cool, if its good enough for him...just thought it might make it more difficult. I suppose whatever works for you.

Regards

londonsean69 · May 26th, 2008, 11:55 AM

Quote: (Originally Posted by robhass)

Last week I watched movie with Casey McKinaly scootering in the cave. He has dump-valve on their right arm, and I cannot see any problems with dumping air during scootering.

Movie is here:
http://www.hogarthian.pl/galerie/pac...nnie_casey.mov

rob

This was on the gavinscooters list, I'll dig it out

Found it

In response to a question about having on the right arm, someone answered

Quote: (Originally Posted by gavinscooterslist)

> Its so you can get to the dump valve when your hands on the trigger.
> Pretty standard with long range diving on a motor I thought.

And Casey's reply to this was

Quote: (Originally Posted by Casey)

> Correct assumption. I'm not convinced that placement on the right shoulder
> is that much of an advantage but it was the most common placement in the
> 90's for those on the team ordering custom suits. My older suit had the
> placement on the right so to maintain consistency, I did the same with newer
> suits. I believe Jarrod has the dump valve on the left shoulder because
> most of his suits are stock and any custom suit he owns has it on the left
> as well to maintain consistency. I believe either location works fine for
> venting.
>
> Casey McKinlay
> Project Director
> Woodville Karst Plain Project

Sorry for the cross posting but I thought it would help

May 25th, 2008, 11:43 PM	#1 (permalink)
Leg of Salmon (Online) New Member Join Date: Dec 2007 Location: Belfast Posts: 131	Dump Valve Positioning The suit I am using now has the autodump positioned over my bicep. This is a sub optimal position for horizontal ascents. I am thinking of having a dump fitted between bicep and tricep and a little closer to the elbow than normal. When horizontal this should be in the correct place. Am I right? I have read some concerns that this position wouldn't allow the suit to hold any air at all. But surely the suit will only dump when the pressure inside is greater than the pressure of the surrounding water. What do you think?

May 26th, 2008, 12:12 AM	#2 (permalink)
TobyFish(Offline) Fine Upstanding Member Join Date: May 2006 Location: Telford, UK Posts: 792	Quote: (Originally Posted by Leg of Salmon) The suit I am using now has the autodump positioned over my bicep. This is a sub optimal position for horizontal ascents. I am thinking of having a dump fitted between bicep and tricep and a little closer to the elbow than normal. When horizontal this should be in the correct place. Am I right? I have read some concerns that this position wouldn't allow the suit to hold any air at all. But surely the suit will only dump when the pressure inside is greater than the pressure of the surrounding water. What do you think? I think the pressure inside the suit is always equal to the pressure outside under diving conditions and that a valve in the fully or nearly fully opened state will dump whenever it is above an air-bubble __________________ Rude-boy Volvo "Gangsta Rollin' in me nine-six-oh"

May 26th, 2008, 12:13 AM	#3 (permalink)
GLOC (Online) Moderator Join Date: Nov 2005 Location: Fleet, Hants Posts: 1,953	There was a thread on this about 2-3 weeks ago. Have a search. A picture says a thousand words, post one and we can see what you mean. Regards __________________ Gareth Images of Life Photography DIR Team Foxturd Travels Underwater and Further Afar If you don't have the time to do something right, where are you going to find the time to fix it? - Stephen King

May 26th, 2008, 10:32 AM	#6 (permalink)
GLOC (Online) Moderator Join Date: Nov 2005 Location: Fleet, Hants Posts: 1,953	Quote: (Originally Posted by Leg of Salmon) Thanks , I have had a read of that thread just now. So, basically, if the dump valve is the highest point in the suit, and it is open fully, it will allow all of the gas to escape. This wouldn't be ideal. So I need a position where it is not the highest point unless I want it to be, and I can make it the highest point easily. Towards the tricep on the right arm might be a good place. Most people have it on the left, for which reason I do not know but I do know that if you ever get to scootering, dumping from the right arm and scootering will be something very interesting to watch __________________ Gareth Images of Life Photography DIR Team Foxturd Travels Underwater and Further Afar If you don't have the time to do something right, where are you going to find the time to fix it? - Stephen King

May 26th, 2008, 11:24 AM	#8 (permalink)
GLOC (Online) Moderator Join Date: Nov 2005 Location: Fleet, Hants Posts: 1,953	Quote: (Originally Posted by robhass) Last week I watched movie with Casey McKinaly scootering in the cave. He has dump-valve on their right arm, and I cannot see any problems with dumping air during scootering. Movie is here: http://www.hogarthian.pl/galerie/pac...nnie_casey.mov rob Cool, if its good enough for him...just thought it might make it more difficult. I suppose whatever works for you. Regards __________________ Gareth Images of Life Photography DIR Team Foxturd Travels Underwater and Further Afar If you don't have the time to do something right, where are you going to find the time to fix it? - Stephen King

May 26th, 2008, 12:36 AM	#4 (permalink)
Leg of Salmon (Online) New Member Join Date: Dec 2007 Location: Belfast Posts: 131	Thanks , I have had a read of that thread just now. So, basically, if the dump valve is the highest point in the suit, and it is open fully, it will allow all of the gas to escape. This wouldn't be ideal. So I need a position where it is not the highest point unless I want it to be, and I can make it the highest point easily. Towards the tricep on the right arm might be a good place.

May 26th, 2008, 09:40 AM	#5 (permalink)
zuckerkringel(Offline) DIRX Supporter Join Date: Dec 2005 Location: Austria Posts: 82	I did it here: Drysuit valve position Best, Hubsi

May 26th, 2008, 11:06 AM	#7 (permalink)
robhass(Offline) New Member Join Date: Nov 2007 Location: Poland Posts: 46	Quote: (Originally Posted by GLOC) Most people have it on the left, for which reason I do not know but I do know that if you ever get to scootering, dumping from the right arm and scootering will be something very interesting to watch Last week I watched movie with Casey McKinaly scootering in the cave. He has dump-valve on their right arm, and I cannot see any problems with dumping air during scootering. Movie is here: http://www.hogarthian.pl/galerie/pac...nnie_casey.mov rob

May 26th, 2008, 11:55 AM	#9 (permalink)
londonsean69(Offline) New Member Join Date: Feb 2006 Location: London Posts: 96	Quote: (Originally Posted by robhass) Last week I watched movie with Casey McKinaly scootering in the cave. He has dump-valve on their right arm, and I cannot see any problems with dumping air during scootering. Movie is here: http://www.hogarthian.pl/galerie/pac...nnie_casey.mov rob This was on the gavinscooters list, I'll dig it out Found it In response to a question about having on the right arm, someone answered Quote: (Originally Posted by gavinscooterslist) > Its so you can get to the dump valve when your hands on the trigger. > Pretty standard with long range diving on a motor I thought. And Casey's reply to this was Quote: (Originally Posted by Casey) > Correct assumption. I'm not convinced that placement on the right shoulder > is that much of an advantage but it was the most common placement in the > 90's for those on the team ordering custom suits. My older suit had the > placement on the right so to maintain consistency, I did the same with newer > suits. I believe Jarrod has the dump valve on the left shoulder because > most of his suits are stock and any custom suit he owns has it on the left > as well to maintain consistency. I believe either location works fine for > venting. > > Casey McKinlay > Project Director > Woodville Karst Plain Project Sorry for the cross posting but I thought it would help __________________ Sean ______________________ If in doubt, give it a clout!