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Tried a different way of making a check valve today... https://www.airgunforum.ca/forums/topic69204.html |
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Author: | vAgRaNt [ Sun Aug 16, 2015 1:19 am ] |
Post subject: | Re: Tried a different way of making a check valve today... |
Quote: . . cracking . . couple psi or less. . . . seals @ 125psi . . . good at 1000psi too. . . .. interesting enough to share.[/. Indeed! |
Author: | FRANK [ Sun Aug 16, 2015 7:34 am ] |
Post subject: | Re: Tried a different way of making a check valve today... |
Hand too clean. I don't see in your pic how you bolt ot down, I read your post understand but pic does not go with your pic no bolt holes in fill valve. |
Author: | Gippeto [ Sun Aug 16, 2015 9:26 am ] |
Post subject: | Re: Tried a different way of making a check valve today... |
I had a spare factory piercing plug assembly in the parts bin...I'm using the nut part to retain the plug. Just drilled it out a little. FRANK wrote: Hand too clean. Will make sure I take a picture next time I change a motor...just for you Frank. Al |
Author: | Mar [ Mon Aug 17, 2015 12:51 am ] |
Post subject: | Re: Tried a different way of making a check valve today... |
You always amaze me and now I might even be interested. How many spares do you have? |
Author: | Gippeto [ Mon Aug 17, 2015 4:40 am ] |
Post subject: | Re: Tried a different way of making a check valve today... |
Only made the one...but I think I heard that Lauchlin has a new lathe... Al |
Author: | Plasticman [ Tue Aug 18, 2015 12:28 pm ] |
Post subject: | Re: Tried a different way of making a check valve today... |
I think I need a QB to play with. |
Author: | EverHopeful [ Tue Aug 18, 2015 9:14 pm ] |
Post subject: | Re: Tried a different way of making a check valve today... |
Does anything stop the screw falling out, or is it held in place by the fill pressure? I've wondered the same thing about things like which looks like the check valve would just fall out and rattle around in the gas tube. How do you start filling something like that? Carefully? Vertically? |
Author: | rrdstarr [ Tue Aug 18, 2015 9:26 pm ] |
Post subject: | Re: Tried a different way of making a check valve today... |
EverHopeful wrote: Does anything stop the screw falling out, or is it held in place by the fill pressure? I've wondered the same thing about things like which looks like the check valve would just fall out and rattle around in the gas tube. How do you start filling something like that? Carefully? Vertically? Good question!?!? I know when using adapters it is held in by those adapters. |
Author: | GerardSamija [ Tue Aug 18, 2015 10:01 pm ] |
Post subject: | Re: Tried a different way of making a check valve today... |
In the case of my HiPAC the aluminum rivet which acts as the check valve stem is held in place by a large plastic washer and a smaller one with a spring pushing those, the spring running the full length of the front section of tube and seating against the head of the next tube threaded in behind it. The spring is a little bit smaller than the tube ID. Seems overkill, filling up a fair bit of potentially usable volume just to press on a tiny rivet. I've been trying to think of a way to get rid of the spring and washers. But since in the case of the HiPAC the Foster nipple is part of the front section there's nothing to unscrew and modify there. With a screwed-in Foster fitting one could perhaps attach a small vented cylinder and insert a tiny spring into that to press on the poppet head... |
Author: | Gippeto [ Wed Aug 19, 2015 6:40 am ] |
Post subject: | Re: Tried a different way of making a check valve today... |
EverHopeful wrote: Does anything stop the screw falling out, or is it held in place by the fill pressure? Screw is threaded in and snugged down. Filed a flat on the threads and slightly into the counter sunk portion for airflow. I've wondered the same thing about things like which looks like the check valve would just fall out and rattle around in the gas tube. How do you start filling something like that? Carefully? Vertically? Foster fill nipples are usually installed into a blind hole...the "stem" cannot fall out as it does not have enough travel in the blind hole. Opens by equalizing pressure on both sides of the seal, closes via flow creating differential pressure. Hold it just right and bleed the pressure slow enough and it won't close at all. A spring will close it, but then it will require a differential pressure to crack it open. The higher the cracking pressure, the greater the differential between what you think you put in...and what's actually in there. Something like this can be used in an "open" hole as the guts are retained by a hex plug. Still doesn't seem to be spring loaded, so flow will be what closes it... http://www.bestfittings.co.uk/shopexd.asp?id=182 Al |
Author: | EverHopeful [ Wed Aug 19, 2015 7:04 am ] |
Post subject: | Re: Tried a different way of making a check valve today... |
Ah, I see - that makes sense, thanks for the explanation. Jim |
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