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Mechanical valve design

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sb327:
I would like some thoughts from those who have studied and/or designed valves.

Weíve seen a few different style valves come to market. Some hammer fired, some not.

What are the things that make a valve system good vs what you donít like?

Some things I feel are important
ES
Efficiency
Easy to actuate (cocking/triggering)

Some things that turn me off
Hard cocking
First shot inconsistencies
Odd triggering (like the L2)

What are some of your opinions on what makes a valve good or bad?

Dave

mackeral5:
In addition to what you have already mentioned, the overall shot cycle is of great importance.  While there are many contributors to shot cycle, the valve is largely responsible for setting the stage so to speak.

sb327:
I agree completely. Many reasons why the overall shot cycle and the transitions the moving masses make affect the overall performance.

Thanks for that input. Not much traffic in the design department these days. Surely not everyone thinks the best designs are already out there. We see balanced valves in a some factory produced hammer fired guns, but is it the best there is going to be for hammers?

Dave

mackeral5:

--- Quote from: sb327 on August 19, 2023, 02:09:56 PM ---I agree completely. Many reasons why the overall shot cycle and the transitions the moving masses make affect the overall performance.

Thanks for that input. Not much traffic in the design department these days. Surely not everyone thinks the best designs are already out there. We see balanced valves in a some factory produced hammer fired guns, but is it the best there is going to be for hammers?

Dave

--- End quote ---

Not necessarily the intended topic of your thread, but related....  Your statement above made me consider hammer/spring systems in a way I had not previously thought..... 
I do not know why it took so long to figure this out....but one of my guns that i struggle with 100 yard accuracy with, often times it will do 3 shots in the same hole, as in less than .375 ctc, then shots 4 and 5 take the group out to 1.5".  Most of its 1.5" groups have 3 shots touching.  I just realized that my SSG weighs a ton....the spring guide moves with the spring/hammer.  I bet this is creating a problem with harmonics.....  In the past I used guide fixed at the rear SSG's and never had to consider the shock wave generated by the SSG itself.  I am going to make some immediate adjustments and see how that affects things....

sb327:
Most definitely a topic of this thread. A valve that requires extra masses moving to be able to operate efficiently will cause other undesirable effects. Itís just another moving part that needs to be kept in harmony.

The balanced valve has been embraced by quite a few but it has some major drawbacks concerning range of tuneability easily (via just hammer spring tension or similar means).

Matt has been working with me on my latest pv design and it is showing some great promise. He has one for his mrod and doing round two of testing. One of its features (not intentional) is that while the hammer may bounce, it canít refire that quick. And my hammer is only 11.5grams (7.7 now but not tested), so Iím really trying to keep my moving mass low.

What are you going to change on the ssg? It will be interesting to see how it affects accuracy. What about running without it for a bit to confirm it is the issue?

Dave

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