Page 288 - The Tribology Handbook

Packed glands B25

JACKET COOLING JACKET COOLING

PTF E
ANTI-EXTRUSION
RING

uI f
LANTERN RING
COOLING WATER u
IN LET

Figure 25.4 ,A gland packing with direct cooling via Figure 25.5 A gland packing with a cooling jacket
a lantern ring for high temperature applications

FLUSHING FLUID BARRIER FLUID
I

Figure 25.6 A packing gland with a flushing fluid Figure 25.7 A packed gland with a barrier fluid
system system

RECIPROCATING PUMPS

Reciprocating pumps also use typically 5 packing rings.
However due to the increased risk of extrusion of the
packing due ito the combination of high pressure and
reciprocating movement, an1 i extrusion elements are
usually incorporated in the gland.
Self adjusting glands can be used on reciprocating
pumps but the spring loading for compression take up Figure 25.8 A reciprocating pump gland with PTFE
must act in the same direction as the fluid pressure anti-extrusion washers between the packing rings
loading, as shown in Figure 25.10.

Figure 25.10 A reciprocating pump gland with Figure 25.9 A reciprocating pump gland with an
internal spring loading to maintain compression of anti-extrusion moulded hard fabric lip seal
the packing
B25.2