Kral NP-03 Burst Disk
- Thread starter SteveKralsAround
- Start date
I was able to source a couple from the UK . Came out to like $6.09/each plus shipping cost , plus customs inspection time . Maybe show up a month from now ...
So in mean time I've ordered some copper shim stock 0.008" . The burst disk measured 0.0085" thickness ; should work just fine .
Next I'm going to fabricate a 9mm round disk cutter . So for you Kral owners out there , I'll have us covered . I'll follow up with production and results in this post when completed .
Steve
So in mean time I've ordered some copper shim stock 0.008" . The burst disk measured 0.0085" thickness ; should work just fine .
Next I'm going to fabricate a 9mm round disk cutter . So for you Kral owners out there , I'll have us covered . I'll follow up with production and results in this post when completed .
Steve
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Isn't the burst disc in the Yong heng compressor the same. I could have swore I put one in my Kral when I owned it.
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The Yong Heng disk are 6.5mm the Kral is 9mm . Might work , I'll look through my Y.H. parts kits see if there is an extra to try out . Also the thickness is 0.04" where as the Kral is 0.0085" I think it would hold the air from leaking but would not be safe in the purpose as intended . I read that the newer type air tanks are only rated at 20% over the rating before they would explode . Which equates to a 200 bar (3000 psi ) tank would explode at 240 bar ( 3600 psi ) .
Pretty easy to make from shim stock . I'll stay with the 0.008 and go upwards if needed . I will construct a test devise to find at what pressure my disk pop .
But thank you for the suggestion .
Pretty easy to make from shim stock . I'll stay with the 0.008 and go upwards if needed . I will construct a test devise to find at what pressure my disk pop .
But thank you for the suggestion .
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I have two in .177 if that tells you . Looking to pick up more in other calibers later on as I find used ones . I tend to modify everything I get though .
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I have the die body and punch done 80% . I had to order a 9mm reamer to finish the hole in the die body and the punch is ready to be ground to final diamention after reaming the die . I'll be ready by next week end . Now to make the burst tester .
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All finished . Disk popped at 225 bar . Cranked out a bunch in short order .
Gonna call it a victory .
Gonna call it a victory .
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No Joy ,
The 0.0085" disk failed at 24 hrs under full tank pressure 200 bar .
I made another batch with 0.010" . See how the time test fares out .
If not , next is 0.013"
The 0.010" is holding ok , 48 hrs at full pressure no leakage .
The 0.0085" disk failed at 24 hrs under full tank pressure 200 bar .
I made another batch with 0.010" . See how the time test fares out .
If not , next is 0.013"
The 0.010" is holding ok , 48 hrs at full pressure no leakage .
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Canada Shooting Supply has them .99 cents a piece for Kral guns plus whatever shipping will be.
https://canadashootingsupply.ca/product/kral-over-pressure-burst-plate/
Or use a soda can and cut to fit.
https://canadashootingsupply.ca/product/kral-over-pressure-burst-plate/
Or use a soda can and cut to fit.
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I bought a 10 pack of 4500 psi disks off of Amazon, they were the correct size for my Kratos and my Karl Bighorn.
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I thought p.a had simple kral gun parts ? Then i dont recall this part listed .. i like these places that are distributor, service/ warentee offical whatevetd , but if you need somthing ...well ..lol. Its like if you aint got stuff for repair how do you do the services?, Right
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Nowhere near enough of a safety factor for this mechanical engineer...I know 4500 PSI SCBA tanks are hydro tested at 7500 psi. Serious anus pucker with a 20% safety factor. A mere pressure guage error could cause a catastrophe.
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