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Homeade Gasket failure

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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Homeade Gasket failure

Unread postAuthor: jsefcik » Wed Dec 19, 2012 7:59 pm

I recevied a 1 1/2 pneumatic relief valve from ebay a while ago and go screwed on it, its been sitting forever and decided to attempt to make a gasket for it,

i put in a rubber sheet, screwed it back together and it popped,

anybody have an idea how to make it stronger?
my dad suggested put a piece of aluminum in between the sheets,

i think that will blow out as well?

or maybe get a thicker sheet,

ideas glady appreciated
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Re: Homeade Gasket failure

Unread postAuthor: dewey-1 » Wed Dec 19, 2012 9:16 pm

jsefcik wrote:I recevied a 1 1/2 pneumatic relief valve from ebay a while ago and go screwed on it, its been sitting forever and decided to attempt to make a gasket for it,


Why can't you ever ask a question in English please?
What is a 1 1/2 pneumatic relief valve?

Why can't you post pictures like you tell everyone else to do?

Why make another posting when you could have used the other one?
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Unread postAuthor: jsefcik » Wed Dec 19, 2012 9:54 pm

this is matties, but i have the same valve

mattyzip77 wrote:pic added hope its "suitable" and appropriate............... :thumbright: :thumbright: :thumbright:


look at the middle one, , that little plastic piece my valve didnt come with it,, im trying to figure out something very strong to seat correctly and seal
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Unread postAuthor: jsefcik » Wed Dec 19, 2012 9:59 pm

this is matties post, but i stole it since i dont have a camera right now

http://www.spudfiles.com/forums/1-1-2-i ... 24807.html

look at his pics i have the same valve, where the rubber seats its only about 1/4 of an inch.

just as i went to pressure it up, it popped, so i need to figure out what to do next,,, someway make the rubber stronger, so it doesnt pop at 100 psi
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Unread postAuthor: MrCrowley » Wed Dec 19, 2012 10:30 pm

To stop anyone else wasting their time saying something I've already said to jsefcik, here's two relevant PMs I've sent to him:

You could epoxy multiple layers together. It really depends where it needs strengthening. Your dad's suggestion isn't a bad one, I've seen many valve diaphragms that are supported by an aluminium (or other metal) gasket in the centre where it seals against the seat.

The rubber needs to be flexible in certain areas I would think, so that pretty much means the centre area that flexes down and seals the valve needs to be able to do this with ease. If you double the rubber over the entire diaphragm, this may cause problems if the centre can't flex enough. However, if you only double the rubber thickness in the centre part that flexes, or reinforce it with a washer, it might solve your problems.

Again, though, I can't really be sure because I'm not sure what the internals look like, where it's leaking, what rubber you're using, etc.


Ok I don't know what you mean by it popping instead of leaking. Did you copy the design of the original diaphragm and check for equalisation holes?


someway make the rubber stronger

I've suggested at least one way and recommended looking in to your dad's suggestion. If these aren't suitable fixes, you need to tell us why so we can actually move on with fixing this problem. You've asked me some questions, I've answered them, and then you've asked everyone else the same questions. We're going to be going around in circles unless you help us out.

edit: just to be clear, jsefcik, this isn't me jumping down your throat or being mean to you. I'm just trying to get you to help us so we can help you.
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Unread postAuthor: dewey-1 » Wed Dec 19, 2012 11:15 pm

jsefcik wrote:look at the middle one, , that little plastic piece my valve didnt come with it,, im trying to figure out something very strong to seat correctly and seal


The diaphragm is Buna Nitrile/Nylon PA6. Kit number K4502.
Here is another variation:
http://www.ebay.com/itm/3916-Goyen-Hytr ... 2934955%26
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goyen-k4502-diaphragm.jpg (28.35 KiB) Viewed 596 times
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goyen-k4502.jpg (15.11 KiB) Viewed 596 times
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Unread postAuthor: jsefcik » Thu Dec 20, 2012 2:40 pm

thats alot cheaper then what i saw before, i asked you first then made the post to get all opinions
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Unread postAuthor: jsefcik » Thu Dec 20, 2012 8:51 pm

i had enough, i got thicker rubber and it still didnt work, im gonna wait till i have the cash and buy the right off ebay
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Re: Homeade Gasket failure

Unread postAuthor: mattyzip77 » Thu Dec 20, 2012 11:50 pm

jsefcik wrote:I recevied a 1 1/2 pneumatic relief valve from ebay a while ago and go screwed on it, its been sitting forever and decided to attempt to make a gasket for it,

i put in a rubber sheet, screwed it back together and it popped,

anybody have an idea how to make it stronger?
my dad suggested put a piece of aluminum in between the sheets,

i think that will blow out as well?

or maybe get a thicker sheet,

ideas glady appreciated


Your a piece of work... The seller refunded your money and let you keep the valve so how did you get "screwed" on it??? Also I seriously dont know how you could screw this up... all you have to do is copy the gasket you have, use your imagination a little and add a thing or two...You have more stories than the bible and lie more than most politicians.... and after like 6 months you still dont know the proper name for the valve in question... dink
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