conjunction with the symbology of pipe fittings
welded and soldered joints, refer to the appendices
or valves. They define not only the size of the pipe
on plumbing symbols found in the back of this
and the method of branching and coupling, but
also the purpose for which the pipe will be used.
This is important because the type of material
from which the pipe is made deter-mines how the
Figure 8-30 shows the symbols used for the
pipe should be used.
most frequently encountered valves. The type of
Figure 8-29 covers only a few of the symbols
material and size of valves are normally not noted
for fittings, joints, and connections used in the
on mechanical drawings but must be assumed
plumbing system. For additional symbols on
from the size and material of the connected pipe.
Figure 8-30.-Valve symbols.