Figure 6-48 shows several types of packing in
and held in place by gland nuts or other
common use today.
devices.
Packing is inserted in STUFFING BOXES
A corrugated ribbon packing has been
that have annular chambers located around
developed for universal use on valves. This
valve stems and rotating shafts. The packing
packing comes in four widths (1 inch, 3/4 inch,
material is compressed to the necessary extent
l/2 inch, and l/4 inch) and is easily cut to length,
rolled on the valve stem, and pushed into the
stuffing box to form a solid, endless packing ring
when compressed (fig. 6-49). Corrugated ribbon
packing is suitable for use in systems of high
temperatures (up to 1200F and 2000 psi). It is
easily removed since it does not harden.
PACKING OF FIXED JOINTS
Figure 6-50 shows gasket material used for
fixed joints. At one time, fiied joints could be
satisfactorily sealed with gaskets of compressed
asbestos sheet packing (view A of fig. 6-50).
Today the 15 percent rubber content of the
Figure 6-49.--Corrugated ribbon packing.
Figure 6-50.--.Fixed-joint gaskets. A. Sheet asbestos gaskets. B. Serrated-face metal gaskets. C. Spiral-wound, metallic-
asbestos gaskets.
6-35