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killercrow
PostPosted: Wed Feb 03, 2021 3:00 pm 
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Location: Spruce Grove AB
I'm just wondering if this stuff is strong enough to build valves and such. I mean it's good enough for what, ~2000psi as a pump piston. Could I theoretically build a valve body, seal it with orings and have it pinned to the tube? Or would the screws just cut through the plastic and shoot me in the cheek?
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Ace
PostPosted: Wed Feb 03, 2021 3:10 pm 
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7075 aluminum is much stronger than delrin.
The tensile strength of 7075 is at least 55000 psi depending on temper and what not
delrin has a 9000 psi tensile strength, now id think when drilling set screws it would
weaken it substantially not sure id chance it...you'd have to ask yourself do you really
want to be that genie pig.... :|

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Gippeto
PostPosted: Wed Feb 03, 2021 3:22 pm 
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I've used delrin for valve seats and poppets, but not the entire valve. The stress on it would have to be worked out.

I would have no reservations about using it in a two piece application like a QB, where the steel ring behind the valve is what retains it. IIRC there have been rifles that used a delrin forward half valve body...might have been the Rapid.

But I march to my own private drum lol. :rolleyes:

Some QB valves;

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Al
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killercrow
PostPosted: Wed Feb 03, 2021 3:53 pm 
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Thanks guys.
Yeah I kinda was figuring on the no side of things. I did think of backing it with steel like in the qb setup.

I'm just pondering on building a valve for a pumper that would be a 2 part build. Check valve in one bushing and the valve body behind it, nothing between the two besides the main tube body.
I'll have to experiment with aluminum.

Al, those are some beautiful valves. Are they just for your own agenda or are they for someone else?
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Gippeto
PostPosted: Wed Feb 03, 2021 4:13 pm 
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Draw something up and shoot me an email.

Al
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Ace
PostPosted: Wed Feb 03, 2021 4:30 pm 
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after posting my reply you got my wheels turning :rolleyes:
if you were to cut a half inch grove indent similar to an o-ring grove
but obviously half inch wide all the way around the back half
of the valve where you would drill and tap your set screws
then place a ring of aluminum in that groove that should create
a lot more support and should be more then sufficient to keep it from failure
hope that makes sense or I can draw something up if you don't get my point

some sweet work there Al.... :prayer: :drool:

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killercrow
PostPosted: Wed Feb 03, 2021 5:20 pm 
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I think I get what you're saying. Kind of like a backing/support bushing but integrated into the valve body? I don't see why it wouldn't work. That plastic stuff is just so easy to work with, I'm really enjoying it :lol:
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Ace
PostPosted: Wed Feb 03, 2021 5:59 pm 
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killercrow wrote:
I think I get what you're saying. Kind of like a backing/support bushing but integrated into the valve body?
I don't see why it wouldn't work. That plastic stuff is just so easy to work with, I'm really enjoying it :lol:

yes something along those lines... :wink:

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Gippeto
PostPosted: Wed Feb 03, 2021 7:45 pm 
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T'will work.

Would do something like this from a Rapid. But without the pointless doubled up oring.

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Al
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killercrow
PostPosted: Thu Feb 04, 2021 4:54 pm 
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I'm not sure I know what exactly I'm looking at there. Sure it does the job though.

Just was playing around with a 2240 valve I have ported for .25 cal. I managed to flat face the seat using a die grinder. Electric tape bushing around the outer surface and it fit perfectly into the valve body :lol: next step, concave poppet.
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Gippeto
PostPosted: Thu Feb 04, 2021 8:36 pm 
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Two black delrin valve bodies with one piece stems...stock valve stem/poppet head fits inside the throat of the modified one.

Al
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clarky
PostPosted: Fri Feb 05, 2021 5:35 am 
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I have stopped posting on here but occasionally take a peek...but I was compelled to chime in here..
Dont do it...
I am materials engineer with significant experience of Delrin...
Drop me a PM if you want, but Im not getting into debates on here anymore..
Nice idea all the same....but have a better material for you.
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Gippeto
PostPosted: Fri Feb 05, 2021 1:11 pm 
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clarky wrote:
I have stopped posting on here but occasionally take a peek......but have a better material for you.


Always welcome to come by and have a "polyether ether ketone". :lol:

Welcome to discuss things as well, running headlong into alternate thoughts is occasionally how we learn. ;) If you have any safety concerns regarding the use of acetal/delrin, please share and discuss them. Many folks here that have used the material and continue to use it. More information is always better.

Regards,
Al
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killercrow
PostPosted: Fri Feb 05, 2021 2:21 pm 
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Yeah I tried to get that peek stuff. First place I went didn't have it so I settled with delrin. But there will be lots of time, for now I guess I'm more or less... Winging it?

Al, it took me a while even after your description of that rapid valve. Because the one stem was positioned backwards I couldn't tell where the seat was and how it opened :lol: Google showed me the way. I like the general design how the stem is sealed. Are they a good product though?
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Gippeto
PostPosted: Fri Feb 05, 2021 3:45 pm 
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Never owned one or even got to play with one. Theoben in England made the Rapid. An earlier and higher end, bottle fed pcp.

I have used delrin seats in metal valve bodies with all metal stems (one and two piece) with total success. Using a one piece machined poppet does allow a fellow to thin out the head section and increase valve volume without actually increasing the size of the valve itself.

Aside....Johnston Plastics in Edmonton will have Peek rod should you wish to try it. Not sure what the minimum is on Peek purchase wise... 1/2" delrin was cheap, but I had to buy a 10' length at the time. Still working on that after 10 yrs or so lol.

Al
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