Industrial seal self study guide - SKF.com

SEAL DESIGN GROUPS (cont.)
CRWA5, CRW5
Waveseals designed without an inner case, CRWA5 has a dual lip
(fig. 3i) and CRW5 has a single lip sealing element. Both are designed
specifically for applications in pressurized seal cavities, up to 90 psi
(.62 MPa).
CRWA5
CRWA5, with a dual lip, is designed
for applications in pressurized seal
cavities (fig. 3i).
HDS1
HDS1 seal’s Spring-Lock keeps
the spring in position during seal
handling, installation, and removal
(fig. 3j).
Large Diameter Metal Clad Seals
Large diameter seals fit shafts 8” (203.20 mm) in diameter and larger.
They come in two basic designs HDS metal clad and HS non-metal
clad (all rubber) seals.
Metal Clad Seals (Type HDS)
Encased in a heavy-duty steel shell, metal clad seals (type HDS)
are specifically designed to withstand the conditions encountered in
heavy-duty applications. These conditions range from slow speed,
abrasive conditions of a scale breaker to the high-speed operation
of finishing stands. They work exceptionally well in rolling mills,
vertical edgers, logging operations and drag line equipment.
HDS type seals are available in three styles HDS1, HDS3 and the
preferred style, HDS2. HDS1 is the basic seal design (Fig. 3j). It has
a single sealing element that features Spring-Lock. The Spring-Lock
270˚ wrap feature keeps the spring in position during handling and
seal installation as well as during seal removal. Spring-Lock is standard
on all three types of metal clad seals.
HDS2 is SKF’s preferred large diameter seal design. It has a single
sealing element and is available with nitrile, Duralip or SKF LongLife
fluoroelastomer lip material. Optional fixed width spacer lugs permit
tandem seal installation, and provide a lubrication gap. HDS2 also
features Spring-Lock encased with a Spring-Kover (fig. 3k).
Spring-Kover is a flexible, resin covering that totally encloses the
garter spring. It is used in sealing applications where dirt or other
contaminants may damage the spring, or where the spring could
be dislodged. The Spring-Kover protects the spring without
affecting its operation.
HDS2
HDS2 has a Spring-Lock encased
in a flexible Spring-Kover covering
(fig. 3k).
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