Page 16 - 4300 Catalog Cover.pdf

Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
4300 Catalog Seal-Lok™ O-Ring Face Seal Tube Fittings
A6
Fig. A3 — Seal-Lok Union cutaway with flanged
and brazed assemblies
The Seal-Lok Braze Sleeve. A second method of sleeve at-
tachment is with the braze sleeve. The sleeve is brazed to the
tube end as shown in Fig. A3. The flat, smooth surface of the
braze sleeve seals against the O-ring when fully assembled.
The holding power is provided by the braze.
The Seal-LokTrap-Seal™. The Trap-Seal, with its consistently
positive retention in the groove, essentially eliminates the pos-
sibility of full or partial O-ring pop out. The seal's trapezoidal
shaped cross-section leads to improved retention within Seal-
Lok's CORG groove and virtually eliminates costly leakage and
time consuming pre-assembly handling. The groove design
has not changed, so the standard O-ring can be used for seal
replacement in the field. Currently, the Trap-Seal is offered in
90-durometer Nitrile (NBR).
How Seal-Lok Fittings Work
The Seal-Lok fitting body face contains a high durometer O-ring
that is held captive in a precision machined groove. As the nut
is tightened onto the fitting body, the O-ring is compressed be-
tween the body and flat face of the tube flange or braze sleeve
to form a tight, positive seal (see Fig. A3).
As the two faces come in contact, further tightening of the nut
produces a sharp rise in assembly torque. A solid pull of the
wrench at this point, to recommended assembly torque, com-
pletes the assembly.The sharp torque rise gives a “solid feel” at
assembly, minimizing the possibility of over tightening.
Because the sealing surfaces are flat and perpendicular to the
assembly pull, they remain virtually free of distortion during
assembly, giving Seal-Lok fittings practically unlimited remake-
ability.The O-ring should be inspected at each disassembly and
replaced when necessary. See the O-Rings and Seals section
for information on replacement ORFS O-rings.
Assembly and Installation
Please refer to Section T for the assembly and installation
instructions for Seal-Lok fittings.
Metric Seal-Lok
The tube/hose end connection for metric Seal-Lok is the same
as standard (inch) Seal-Lok. It consists of a body, a flange or
braze sleeve, an O-ring and a nut. The difference is at the port
end of the fitting. Instead of the SAE straight thread connec-
tion, it features a similar connection with metric threads per ISO
6149-2. Additionally, the fitting body, tube nut and locknut are
manufactured with metric hexes or forging wrench flats. The
metric Seal-Lok fittings meet or exceed all requirements of
ISO 8434-3.
Braze Sleeve
O-ring (Trap-Seal)
Parflange
Sleeve
Nut
Fitting Body
Fig. A4 — Metric Seal-Lok Straight and Shaped Connectors with
Identification for use with ISO 6149-1 Port
Fig. A5 — Metric (Tube) Seal-Lok Sleeves
Turned Diameter
with Groove
Turned
Diameter
Small Identification
Groove for Metric Tube