Block/Valve Configuration

[Rabbitstopper]

Evening all,

The number of different valve and block configurations I see with o-rings by the bucket load make me wonder why?  I'm contemplating machining a block with the valve integral. I.e a hole in the front around 21mm so I can thread bsp for a regulated tube plus plenum, same hole in the back to accommodate hammer (teflon sleaved) and a Thai side lever on top. 3 o rings to seal tube to block, 2 on transfer port (not really necessary) and that's it apart from probe. Basing this build on the 22xx platform which I can get the excellent 17 trigger group for. I'll have to draw it out but simplicity is the aim.

What would the advice be on a simple but effecient rig? Is going balanced that much of an advantage also?

David.

[Gippeto]

A single oring gets the job done, no need for 2-3 or 4 oring setups.

Benefits from balanced valves depend on what your after. IMO, there's not much point at 20-30fpe...just too easy to get that with a basic poppet. Would suggest 40fpe and up there are some nice benefits with cocking force reduction.

An ssg is almost a must have when going the balanced valve route...so it adds complication and extra parts count to manufacture.

Just my .02

Al

[Rob M]

balanced not worth the hassle for a basic HPA 22xx gun.. AS for the drop block , hook straight to the valve and make sure to leave yourself some plenum volume or that will be a choke point..Theres a million ways to skin the cat, ive done about a dozen of them and theyre all a P.I.T.A  to be honest . A few people have ordered the gauntlet drop blocks , which are very cheap( 21 shipped ) but that still presents the challenge of sealing the tube and the valve to the tube.. Back to connecting straight to the valve, reducing the risk of chasing down internal leaks after assembly..
heres one rendition in 9mm i made recently , its not really a drop block , But making a breech is about the same complexity as making a drop block so i figured id make the part with fewer orings 


20200130_161959_HDR (1) by murphyrobert9, on Flickr

[antithesis]

balanced not worth the hassle for a basic HPA 22xx gun.. AS for the drop block , hook straight to the valve and make sure to leave yourself some plenum volume or that will be a choke point..Theres a million ways to skin the cat, ive done about a dozen of them and theyre all a P.I.T.A  to be honest . A few people have ordered the gauntlet drop blocks , which are very cheap( 21 shipped ) but that still presents the challenge of sealing the tube and the valve to the tube.. Back to connecting straight to the valve, reducing the risk of chasing down internal leaks after assembly..
heres one rendition in 9mm i made recently , its not really a drop block , But making a breech is about the same complexity as making a drop block so i figured id make the part with fewer orings 


20200130_161959_HDR (1) by murphyrobert9, on Flickr

any better detailed view or description of that coupler collar between the tube and bottle?

And how did you get the gauge on that?

I'm quite sure it's not going just through the wall? Or Maybe i don't understand it's construction as well as I thought at first glance?

[KnifeMaker]

I would think the gauge is threaded into the fitting that goes a ways into the tube.


Knife

[Rob M]

the coupler is an aluminum adapter machined on both sides , one side with female 9/16-18 to connect to the valve , other side is female m16-1.5 to connect to the tank..The gauge goes right into the tank wall , its pretty thick steel wall but really i was lucky it sealed. The foster is on the end where the wall is thickest..  The outward pressure on the gauge threads works out to be about 215lbs at 2000 psi *(max fill

[antithesis]

the coupler is an aluminum adapter machined on both sides , one side with female 9/16-18 to connect to the valve , other side is female m16-1.5 to connect to the tank..The gauge goes right into the tank wall , its pretty thick steel wall but really i was lucky it sealed. The foster is on the end where the wall is thickest..  The outward pressure on the gauge threads works out to be about 215lbs at 2000 psi *(max fill

Wow Rob that's pretty clever.....also lucky to seal like you say

[Rabbitstopper]

That is a very nice looking set up, did you make the breech yourself?

[Rob M]

That is a very nice looking set up, did you make the breech yourself?

yes, I did..breeches are the Rubiks cube of airgun parts, almost anything else is easier or less time consuming,or both

[MJP]

Nice looking setup you have!
Just wondering why two levers?
Marko

[Rob M]

Nice looking setup you have!
Just wondering why two levers?
Marko

I originally made it to cock with the bolt handle, but I found that I was very limited on bolt travel for loading 9mm , and I thought I needed more hammer travel. ( which may not have been the case idk