Page 49 - 4300 Catalog Cover.pdf

B3 Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
4300 Catalog Seal-Lok™ Lite O-Ring Face Seal Tube Fittings
Seal-Lok Lite Introduction
Parker’s Seal-Lok Lite fittings combine the traditional versatility
of stainless steel Seal-Lokwith the added feature of being adapt-
able to the new Flex Flange product line. Seal-Lok Lite fittings
incorporate the O-ring face seal design to form a leak-tight seal.
Seal-Lok Lite shaped fittings with SAE straight thread adjust-
able studs also feature Parker’s new Robust Port Stud®, which
provides improved reliability and easier assembly. Seal-Lok
Lite fittings are not a direct interchange with standard industrial
O-ring face seal fittings. Seal-Lok Lite’s leak-free, compact
design makes it suitable for use in applications for low pressure
gases and general light duty industrial systems.
Design and Construction
The Seal-Lok Lite fitting consists of four main components: a
body, a sleeve, an O-ring and a nut. The body, sleeve, and nut
are manufactured from 316 stainless steel.
The Seal-Lok Lite Fitting Body: Seal-Lok Lite fittings are
manufactured in the most popular stainless steel sizes and
configurations. The body is manufactured with Parker’s CORG
(Captive O-ring Groove), which keeps the O-ring captive during
installation. Straight bodies are machined from cold drawn bar
stock, ensuring consistent dimensional tolerances, improved
strength and better surface finish. Shaped Seal-Lok Lite fittings
are manufactured from a one-piece forged construction. This
forged construction provides added strength and longer service
life, while eliminating the potential leak path associated with
multi-component brazed fittings.
The Seal-Lok Lite Fitting Nut: Seal-Lok Lite tube nuts are
machined from cold drawn bar stock. The Seal-Lok Lite tube
nut is not interchangeable with the standard ORFS tube nut,
as it is much shorter, more compact, and incorporates a metric
thread.
The Seal-Lok Lite Parflange Sleeve: The preferred method
of making a Seal-Lok Lite connection is by using the Parker
Parflange machine to create the 90° flange on the tube end.
The sleeve provides a contact shoulder for the nut and supports
the flange and tubing. The Parflange process provides the fol-
lowing advantages:
• Several times faster than brazing
• No special pre- or post-flange cleaning
• Cleaner and safer than brazing
• Eliminates a potential leak path associated with braze
joints
The Seal-Lok Lite fitting uses a standard Parflange sleeve
and tooling. See Equipment section for the available Parflange
tooling.
The Seal-Lok Lite Braze Sleeve: A second method of sleeve
attachment is with the braze sleeve. The sleeve is brazed to the
tube end as shown in Fig. B3. The flat, smooth surface of the
braze sleeve seals against theO-ringwhen fully assembled.The
holding power is provided by the braze. An additional method is
a butt weld connector (TLW1) that is also used with a tube nut.
It is designed especially for orbital welders.
Fig. B2– Captive O-ring Groove (CORG)
Fig. B1 – Seal-Lok Lite Fittings
Fig. B3 – Seal-Lok Lite union cutaway with flanged and brazed
assemblies
Braze Sleeve
O-ring Parflange
Sleeve
Nut Fitting Body