I am interested in designing a breech loader and I wonder about the seal.
Obviously, the pilot valve dumps some pressure.
But what about the breech seal?
I built a 1/4" copper barrel gun with a 1/4" pneumatic quick connect as a breech.
Disconnect, and separate the barrel with the attached male connector to load.
The quick disconnect made a tight breech but there was a lot of dead volume.
A break barrel with a union is similar.
Thoughts?
BoyntonStu
Posted: Wed Oct 14, 2009 8:32 am
by Crna Legija
Ideally one would want a prefect seal. the quick connect will restrict the flow lots so it will hurt performance. The best is to put a o-ring on the outside of you barrel and have it slid in to a fitting. You could also use a cam-lock
the break barrel i found its hard make a good seal. Just finished my new canon with break barrel breach, ill post it tomorrow
Posted: Wed Oct 14, 2009 10:12 am
by boyntonstu
-_- wrote:Ideally one would want a prefect seal. the quick connect will restrict the flow lots so it will hurt performance. The best is to put a o-ring on the outside of you barrel and have it slid in to a fitting. You could also use a cam-lock
I designed this variant on the popular design for use at higher pressures, and to disrupt flow as little as possible - while keeping dead volume down.
The seal is a pipe into an appropriate fitting, complete with a thick grease - fine for the job, but I suppose it could be improved by cutting a slot into the walls of the "fitting" the pipe fits into so that it seals through an O-ring. Not entirely necessary though.
-_- wrote:Ideally one would want a prefect seal
Is that like a Prefect's badge? :tongue3:
Posted: Wed Oct 14, 2009 11:17 am
by Crna Legija
that would seal it good, but the point of brech loading is to make it fast.The union takes it away could of just put a sliding barrle and clean up all the junk around the pilot.
