457 / 257 airgun balanced valve function

[@DoNotPushHere]

Thank you so much!!! Now it's all clear! I'm used to QEV's and not much more advanced than that...

[@aleksandrsnaumovs4277]

Interesting design. You effectively reduce the crossection that is exposed to the HPA allowing for a much smaler hammer/spring. The connection with the atmosphere is quite clever, good job! I see a problem with tuning the device for particular sectional density of the ammo used. The dwell time will depend on the small volume and the port size as you mentioned however changing either is not quite easy. Keep posting the progress. Good job!

[@emilkarlsson9387]

Great video! It makes total sense now

[@bahareh-cv6ek]

Really informative❤

[@jafinch78]

Neat design. Thanks for sharing the details. Was thinking the operation was something like you mentioned. However, I didn't visualize the more elaborate way you've demonstrated. Would be interesting to see more of the internals of your best design. Inspiring enough as is. I do wonder about how to make for harvesting animals for food more cleaner like using steel shot in shotguns... so to use no lead or heavy metals. Ever had thoughts about regarding? Guessing polymers or like full metal jacket around healthier metals with steel shot inside.

[@MJPilote]

jafinch78 Making a bigger caliber gun and using subcaliber ammo with sabots is one way. Have used sabot rounds with my .457 and 20mm airgun. There is supersonic shot video of the 20mm shot using 600grain .50 projectile with 3D printed sabots.

[@jafinch78]

@@MJPilote I'll take a look. Never thought about 3D printing sabots. Forgot to ask also, did you cast the the plunger/seal ends of the valve using a mold? What material & specs do you use?

[@MJPilote]

jafinch78 No cast parts, seal material is PEEK and all the valve part are turned in a lathe.

[@rodgerpettiet7552]

Thank you, Sir.

[@Sh4d0wcry1]

Do you operate a similar valve (just bigger) on your 20mm air-gun? I´d love to build a .50 or .54 and am looking on how/how big to build the valve, I´d wish to get some input from you based on your experience.

[@flyingfeathers8259]

Thank you for your sharing.

[@4502422300]

great. thanks for for sharing this with us. could you please tell us sth about the diameter oft the piston und the valve stem... etc.

[@MJPilote]

Valve stem is 5mm other measurements are aplication dependant. you can have 40-65% of balancer force to your closing force depending on hammer mass, barrel bore and projectile weight. One size does not fit all. like on my case the forces change so much from going to .257 from .457 that the valve broke. Test and youll find what works for you.

[@ArmanMnatsakanyan]

@@MJPilote You could make the valve out of metal, since the sealing surface is that rubber o-ring either way, right?

[@MJPilote]

@@ArmanMnatsakanyan I have already made a new piston out of steel. The original was out of PEEK and lasted for two years.

[@ArmanMnatsakanyan]

@@MJPilote Thank you for explaining the concept. I found your video link in GTA forum. I'm trying to make a variation of one of those valves without a lathe but may have to buy one for anything besides a proof of concept.

[@redgum1340]

Your balanced piston is broken. Do you know it is breaking? Is your hammer spring too strong?

[@MJPilote]

Oh I didn't notice it. 😉 Nothing to do with hammer spring, it's not bottoming out. I'm making over 1000J of muzzle energy on .457 and the peek balancer has hard time working the valve. After awhile it's going to break, so I made the new one out of titanium.

[@taimpro2998]

👍😉

[@kangmashakim3998]

Marko i thank u for you have share ss valve design , but i have question for you, 1. How thick is ss valve tube chamber? It look like less than 1,5 mm thick , dont it getting in trouble when u fill the air pressure at 4500 psi? 2. I see in this video u have pretty big size drilled stem, how wide is it? 3. Can u mention how long poppet drilled vent to the balanced chamber? 4. Please explain how much volume that ss piston chamber? Because it so much affected on me to launch heavy slug for .357 , thanks so heavy for u, Very glad u had shared it

[@MJPilote]

Valve chamber is titanium, and has 3 times the safety margin for yield. Stem is 5mm and chamber port is no longer than 10mm max. Can't remember the exact dimensions. Piston volume is irrelevant if you have enough flow in to the valve. I have made 500-980J with this valve on different setups.

[@kangmashakim3998]

@@MJPilote alright , i know some measurement not realy relevant, at least it would make me easier to proof what u , bob and others has done by the chart, thanks so much marko, 🙏

[@airgunenthuciast8323]

Not a question, but if you ever decide to sale any of this airguns regardless of the caliber, 233, 257, 457 it does not matter i would be interested

[@MJPilote]

airgun enthuciast Well I usually don't sell my guns, only couple of people own some of my earlier guns. EU gun laws changed and I'm not a certified gunsmith so I cannot make bigbore airguns for sale without a license.

[@airgunenthuciast8323]

@@MJPilote that's a shame but yeah EU laws on airguns are strict compare to the usa , but just gorgeous work, i really like removable bolt part

[@pelucheune271]

Hello sir can you tell me whats this item and where i can buy one please . Thanks you sire.

[@MJPilote]

You really can't buy the parts, I have made all of them myself.

[@BhaursAirguns]

Sir, I hope you know about RAW HM1000X .25 60ftlb version. Please suggest what kind and dimension of balanced valve will work? It's a regulated gun. What benefits a balanced valve can give me against the traditional valve?

[@MJPilote]

On a regulated small bore there is very little to gain from balanced valve. It is more suited for big bores that need very heavy hammer to actuate.

[@BhaursAirguns]

But my RAW HM1000X has around 80 gram hammer and I want to reduce the hammer weight for a quicker shot cycle

[@MJPilote]

FX impact and other PCPs (Umair Bhaur's Channel) what size valve poppet and ports? Huge hammer for 25 cal

[@airgunsofidaho4886]

@@BhaursAirguns A balance valve will make your. 25cal go from 60 foot pounds to over 100+ foot pounds. I have a few balance valves.

[@BhaursAirguns]

Please see my two videos on upgradation of RAW HM1000X 60 ftlb. I don't refer a certain type of Cobra or balanced valve. What I prefer I have shown in my videos on same KZbin channel

[@mytreasure8720]

Which grade titanium tubes suitable for 4500 or 3500psi airtube

[@MJPilote]

You need material datasheet and do calculations based on that data. I wont give specifications for any material as there is much more information needed than just material. You need to hydro test one specimen of every design to its yield before calling it safe. Threads and seal locations are all critical to a good safe pressure container.

[@this1spatrick149]

Do u check FPS of this gun?

[@MJPilote]

This1sPatrick Not yet on this construction, but similar gun I made did 330m/s with 70gr bullet

[@this1spatrick149]

Nice!

[@gustverschelde9654]

i dont understand why the valve stays closed when so much pressure is on it, doesn't it push the valve open when you dont want it do open.

[@MJPilote]

There is more surface area keeping the valve close than there is on the balancer to open it, so it is biased on the closing.

[@bigbirderbob3710]

Great. You just don't get good instruction like that on youtube. Its mostly people wanting to share everything about making airguns with plumbing equipment (dangerous).

[@henriquemarques5746]

Me passa as medidas da válvula de disparo ou projeto

[@khamphasanbat4978]

Pcp ok

[@MJPilote]

Kham pha san bat Yes for pcp airgun.