Schrader pressure limit?
- boyntonstu
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What is the maximum pressure that a Schrader valve can be used in a pneumatic cannon?
IOW I would like to try a Schrader valve to fill the gun an also use it as the pilot valve.
My inspiration comes from this:
Will a Schrader take 600 psi?
BoyntonStu
IOW I would like to try a Schrader valve to fill the gun an also use it as the pilot valve.
My inspiration comes from this:
Will a Schrader take 600 psi?
BoyntonStu
- Mr.Sandman
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Well i you can find it i believe there is a thread where gippeto has tested the valve core to 7500 psi. So i do believe it will take the pressure. I have personally used them to 1500 psi with no problems
Yeah, it's that important.
- boyntonstu
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What kind of chuck did you use?Mr.Sandman wrote:Well i you can find it i believe there is a thread where gippeto has tested the valve core to 7500 psi. So i do believe it will take the pressure. I have personally used them to 1500 psi with no problems
Was it a no-leak or a conventional chuck?
BoyntonStu
- Mr.Sandman
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I used this ancient schrader adapter i found in my dads tool box. Rated to 3000 psi is engraved into it.boyntonstu wrote:What kind of chuck did you use?Mr.Sandman wrote:Well i you can find it i believe there is a thread where gippeto has tested the valve core to 7500 psi. So i do believe it will take the pressure. I have personally used them to 1500 psi with no problems
Was it a no-leak or a conventional chuck?
BoyntonStu
Yeah, it's that important.
- boyntonstu
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Did you hold it against the valve at 1,000 psi or was it connected?Mr.Sandman wrote:I used this ancient schrader adapter i found in my dads tool box. Rated to 3000 psi is engraved into it.boyntonstu wrote:What kind of chuck did you use?Mr.Sandman wrote:Well i you can find it i believe there is a thread where gippeto has tested the valve core to 7500 psi. So i do believe it will take the pressure. I have personally used them to 1500 psi with no problems
Was it a no-leak or a conventional chuck?
BoyntonStu
- Crna Legija
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600psi wont brake the valve.
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- Gippeto
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Yeah, tested to 10000psi actually. Destroyed the sealing face of the core, but no other damage. Replaced the core and it's in use today.
Here ya go Stu;
http://www.aircraftspruce.com/catalog/l ... seneck.php
Schrader USA prt# 6116
Rated for 3000psi.
Here ya go Stu;
http://www.aircraftspruce.com/catalog/l ... seneck.php
Schrader USA prt# 6116
Rated for 3000psi.
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Liberalism is a mental disorder, reality is it's cure.
Liberalism is a mental disorder, reality is it's cure.
- jackssmirkingrevenge
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I've used a schrader as a pilot on a 1" piston but you need to have an efficient design with a tight piston and limited piston movement to ensure minimum pilot volume. Of course if your design has an airtight piston that greatly increases your chances of success.
- boyntonstu
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Don,Gippeto wrote:Yeah, tested to 10000psi actually. Destroyed the sealing face of the core, but no other damage. Replaced the core and it's in use today.
Here ya go Stu;
http://www.aircraftspruce.com/catalog/l ... seneck.php
Schrader USA prt# 6116
Rated for 3000psi.
Thanks,
Did you ever fill to 600 psi using a "regular" air chuck that you held against the Schrader?
Here's a no-leak chuck that may work:
http://www.tire-pressure-gauge.com/inde ... ucts_id=19
What do you think?
I am afraid that if I do away with the ball valve the Schrader may leak when I remove the chuck and accidentally fire the cannon.
BoyntonStu
- boyntonstu
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Great work.jackssmirkingrevenge wrote:I've used a schrader as a pilot on a 1" piston but you need to have an efficient design with a tight piston and limited piston movement to ensure minimum pilot volume. Of course if your design has an airtight piston that greatly increases your chances of success.
You got there before me, wonderful!
Have you thought of a trigger mechanism to press the Schrader?
Bravo!
BoyntonStu
- Crna Legija
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I have got 300psi with a but i had to push it keep it on.i use QD now its ezyer. Air you using co2 or air.
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- this is the one i have tested to 300 i dont go over that i could but dont feel safe.
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- jackssmirkingrevenge
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Usually the first bolt/screwdriver/allen key I find lying aroundboyntonstu wrote:Have you thought of a trigger mechanism to press the Schrader?
Closest I made to an actual "trigger" was on the original pen gun.
- rcman50166
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This one is rated for 5000 psiboyntonstu wrote:What is the maximum pressure that a Schrader valve can be used in a pneumatic cannon?
IOW I would like to try a Schrader valve to fill the gun an also use it as the pilot valve.
My inspiration comes from this:
Will a Schrader take 600 psi?
BoyntonStu
- Gippeto
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Stu, I have tried a couple of those "clip on" style chucks. They blow off at ~250psi. I use only probe style fills and threaded connections with check valves now. Trouble free.
http://www.pyramydair.com/site/articles ... d-port.jpg
Another option is these fittings used on many pcps. They have the check valve built in. For lower pressures, I'm sure you can figure how to make one from a common compressor fitting?
http://www.crosman.com/blogs/croswords/ ... shots2.jpg
The fitting I linked you to previously, does not open the valve, rather the incoming pressure must overcome the spring on the schrader. This means that when you stop pumping and go to remove the fitting, the schrader is already closed and won't leak.
The downside, is that you need to generate the extra 70psi to crack the schrader open.
http://www.pyramydair.com/site/articles ... d-port.jpg
Another option is these fittings used on many pcps. They have the check valve built in. For lower pressures, I'm sure you can figure how to make one from a common compressor fitting?
http://www.crosman.com/blogs/croswords/ ... shots2.jpg
The fitting I linked you to previously, does not open the valve, rather the incoming pressure must overcome the spring on the schrader. This means that when you stop pumping and go to remove the fitting, the schrader is already closed and won't leak.
The downside, is that you need to generate the extra 70psi to crack the schrader open.
"It could be that the purpose of your life is to serve as a warning to others" – unknown
Liberalism is a mental disorder, reality is it's cure.
Liberalism is a mental disorder, reality is it's cure.
- jackssmirkingrevenge
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... unless you "doctor" the stem springGippeto wrote:The downside, is that you need to generate the extra 70psi to crack the schrader open.