The Reliable Model J168 Automatic sprinkler utilizes
the center strut solder in compression principle of construction.
The fusible alloy is captured in the cylinder
of the solder capsule by a stainless steel ball. When
the fusible alloy melts, the ball moves into the cylinder
allowing the cylinder to separate from the center strut.
When this happens, the lever is released to spring free
from the sprinkler so that all operating parts clear the
waterway allowing the deflector to distribute the discharging
water in a hemispherical pattern.
The Reliable Model J168, 16.8 K-factor sprinklers
were tested in full scale fire tests to qualify them for the
protection of rack and high piled storage.
Note: Some sprinkler head may or may not have Teflon tape applied. The heads have never been installed.