If the TP is too thin, and the air can get around the outside of it, it can collapse inwards.... Likewise, if unsupported on the outside, it can blow outwards....Bob
i make matching plunge cuts in the tube / valve and the breech.. Then make a nylon TP , fairly thin wall that fits the connection.. As its fired , it generally seals better and better due to the flexibility of the nylon expanding torward the walls.. The tp is completely captive , so it has nowhere to blow out
??” I would need about 35,000 psi”??
some serious power there.
Great project! Thanks for sharing. Could you possibly use green loctite to secure a bushing to enable better o-ring seal? Or perhaps an extended boss protruding? Just thinking.
Is it possible to do a flat face o-ring seal? https://usmegastore.com/product/dixon-valve-fs6400-10-10-zinc-plated-steel-1-14-male-flat-face-x-7-8-14-male-sae-o-ring-connector?utm_source=bing&utm_medium=cpc&utm_campaign=bing_shopping_ads&msclkid=899157b1484f109e284d36fc6d07eb64You would need a method to hold the parts together, (chamber & barrel).You do not need the outside retaining diameter as the counterbore / recess serves this purpose.And do you have any piloted counterbores to improve on the roundness of the recess?https://www.msdiscounttool.com/catalog/product_info.php?csv=gg&products_id=98810&msclkid=404ad195a6cc19d0d4d7b0d881f4a797&utm_source=bing&utm_medium=cpc&utm_campaign=**LP%20Shop%20-%20Drills%20%26%20Screwdrivers%20(2)%20-%20%2410%2B&utm_term=4586956356259005&utm_content=98810%20%7C%20M6%20HSS%203F%20Solid%20Pilot%20Counterbore%20%7C%20%2419.92
that tp made completely from delrin and press fit into the valve would work , and would seal. and id bet it wont blow out either