Sidelever breech build for 7/8” tube

[sb327]

Is this the hammer valve?

https://patentimages.storage.googleapis.com/ac/a7/52/177a326b9c7f46/US20180195831A1.pdf

Don’t have much time right now to make sure

Dave

[Rob M]

nice , while i dont fuly understand  the diaghram , i dont see why theyd file a patent for any of the other guns. ( and it was filed 2017

[sb327]

Does the valve travel inside the round bar to the right?

Dave

yes , it has an oring roove  inside the tube to the right , that seals the spool .. SO the poppet side of the spool is .440 and the right side is .375 sliding through a static seal. the " pullstud" to the far right is connected directly to the spool.. SO very little force is needed to unseat the valve , reseating is the spring and the slight diamter differential  ( the air fed into the chamber being restricted also aids in the valve closing

So something like this?

Dave

[Rob M]

thats exactly right dave ... Furthermore , I think it would need a metered supply from res , either choked by adjustment , or a secondary poppet much like discussed in the huben thread. I never hooked up a large supply of air to it , So no clue if it would reset while having  air flowing inward.

[sb327]

This is only a suggestion. It looks complicated at first but it’s not. You can make this thing adjustable real easy.

Take a look at this. I will comment more in a bit. I have some machining suggestions that will make life easier.

Dave

[Rob M]

i see what you mean , have the balance hole through the spool , and a second set of partial seals at the right side of the spool So the return pressure assists with closing the valve , and can be a metered port via small threaded set screw hole. ( or metered by the pullstud itself

[sb327]

Yeah, I would just use the pullstud to meter. For simplicity sake.

Now we don’t need to forget, when testing, valves react differently when they are pushing a pellet vs dry fire. Especially valves that are dependent on throat pressure. Not saying it won’t cycle but it is affected.

Dave

[sb327]

Now compare the previous to this....

[Rob M]

yours is hammerless, and appears to be bias open, not shut?

[sb327]

That’s Jacks.

Biased closed.
Hammer opened.

This design actually uses the vent to INCREASE closing force.

A regular bv uses the vent to negate the opening force the bv subtracts from the closing force.

This design does have the easy opening effect of a normal bv as well but with enhanced closing. Keep in mind this design is still theoretical.

Dave

[Rob M]

i see now that its biased closed.. and this is the one where the idea of a metered inlet was tossed around. or a secondary poppet ( gettting mixed up with all the aniimations lol

[sb327]

Me too