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Mechanical valve design

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mackeral5:
I weighed the moving parts, they are 22-24 grams across the 2 SSG's in question.  That is 22-24 grams accelerating and coming to a hard stop, before the hammer even contacts the valve stem.  All of my previous SSG's were guide fixed at the rear style so all that was moving was the spring and a washer.  Never really considered all of this moving mass until now.. 

I replaced both SSG's with a short stiff spring, yielding similar, possibly even less cocking effort.  So far the shot cycle seems a bit smoother, but need more testing to determine true impact. 

The work y'all are doing on balanced valves has been very informative based on what has been shared publicly.  I look forward to seeing more.







Rob M:
David , have you looked at the Umarex Hammer valve ? it appears to be a qev valve somewhat similar to your build..I think being easy to open is paramount.  Eliminating the valve stem and moving it to the front of the poppet in a conventional hammer valve is something i explored. Getting that .125 stem out of the throat requires less poppet diam , less throat diam etc

sb327:
Mike,

That does seem like it would cause an extra event to have to deal with during the shot cycle. Significant anyway.

Rob,

I remember looking at the hammer early on in the piloted valve adventure. I canít seem to find one to look at now.

I have two different valves that run on the pilot principle. An inline and a conventional. Iíve been working on the conventional one lately. Testing (mine and Mattís) have shown some surprising results. Efficiency is good, no orings in the design, inability to release air due to hammer bounce, hammer strike tuneable along with the obvious advantages of light hammer strike.

The main disadvantage is that itís not easy (for me anyway) to build, lol. I could make a couple balanced valves in the time it takes to make this one. But if you like to mess with valves, itíll be one I suggest to try.

Dave

Rob M:
yea thats always the challenge, building it , testing , retesting , figuring out what will seal and what wont. I do think the huben style valve is brilliant , but super complex ,, I think the leishy 2 uses something similar.

mackeral5:

--- Quote from: sb327 on August 24, 2023, 09:04:47 AM ---Mike,

That does seem like it would cause an extra event to have to deal with during the shot cycle. Significant anyway.

Rob,

I remember looking at the hammer early on in the piloted valve adventure. I canít seem to find one to look at now.

I have two different valves that run on the pilot principle. An inline and a conventional. Iíve been working on the conventional one lately. Testing (mine and Mattís) have shown some surprising results. Efficiency is good, no orings in the design, inability to release air due to hammer bounce, hammer strike tuneable along with the obvious advantages of light hammer strike.

The main disadvantage is that itís not easy (for me anyway) to build, lol. I could make a couple balanced valves in the time it takes to make this one. But if you like to mess with valves, itíll be one I suggest to try.

Dave

--- End quote ---

Dave-  Regarding the current valve you are working on....I could tell there was more to it the way Matt has been rather exclamatory about the fact that the valve is almost accidental discharge-proof.  Whether intentional or not it is almost like he is trying to bait someone in to a debate on the topic.  I look forward to if and when the two of you share what your recent learnings.

Regarding the current Simplified balanced valve....  The ability to tune balance chamber volume via piston height, and the piston being moveable away from the valve seat, that coupled with some type of hammer-induced lift control  and buffer system proved to be very good tuning tools.  I somewhat have  a decent grasp on how they interact, but there is still more to learn.  I paused that testing for a while, degassing to adjust piston height and test was wearing on me.  I'll resume at some point, but for now I returned the test mule back to a simple peek poppet over a minimum for caliber valve throat area....

Mike

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