Page 253 - The Tribology Handbook

619 Selection of seals

RUBBER ,BONFfsEMETAL PUMP SEAL FACES
CASE \ HOUSING / ;”’ RING

ATMOSPHERIC
-
SIDE

ARTER SPRING
\ LAMPING FLANGE
SEALING CONTACT I \
(0.25- 1.0rnm) STATIONARY
ROTATING SHAFT GASKET SEALING HEAD
Figure 19.1 Rotary lip seal Figure 19.2 Mechanical seal

PISTON SEAL ROD SEAL
PUMP ,ADJUf:: ENT \ I
HOUSING
I
ATMOSPHERIC

Figure 19.4 Square-backed ’U’ seals as piston and
rod seals in a hydraulic cylinder

-

ROTATING OR RECIPROCATING PACKING
SHAFf
Figure 19.3 Packed gland Figure 19.5 Chevron seal with shaped support rings

0 RING

PTFE
-

LOBED ‘0’ RING
Figure 19.6 ‘0‘ ring seal
on control valve spool Figure 19.7 Lobed ‘0 ring Figure 19.8 Coaxial PTFE seal

(a1 (b)
Figure 19.9 Metal bellows: (a) formed; (b) welded
B19.2