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When the Air-Gun is assembled and in it's Uncharged state. (no
compressed air inside) The spring between the piston assembly and
the screw on cleaned cap will hold the stopper against the end of
the barrel that is inside the air chamber creating an airtight
seal to allowing the air chamber to be charged. (compressed air
added)
NOTE: The air chamber is the space between the barrel and the
larger outer tube. The piston is inside the air chamber, for the
sake of clarity I will call the large airspace in front of the
piston the "primary air chamber" and the smaller air
space behind the piston (which has the spring) the
"secondary air chamber"
The "solenoid type" sprinkler valve is attached to
the secondary air chamber through the cleaned cap with a 1 inch
pipe nipple that is 1 1/2 inch long. When the Air-Gun is charged
(to 100 psi) and ready to fire the valve is opened (use momentary
switch and batteries) the air pressure inside the secondary air
chamber is instantly dropped to 0 psi. The air pressure in the
primary air chamber then pushes the piston backwards into the
secondary air chamber pulling the stopper away from the barrel.
All the compressed air in the primary side of the air chamber
then rushes out the barrel pushing anything in the barrel out at
a great speed.
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