Page 5 - pages 001 - 013.pmd

Dixon Quick Coupling 877-963-4966 6
Apply 1½ to 2 wraps of PTFE tape,
starting one or two threads from
the lead edge, in a clockwise
direction. For 316 stainless steel,
be sure to use stainless grade
tape.
Check threads to make sure there
is no obvious damage on either
half and that tape is properly
installed. Align male and female
threaded connections and carefully
begin threading the two halves
together.
Finger tighten the connection and
create a reference mark on the hex
of the hose end/adapter and the
coupling. This mark will help
identify the number of revolutions
during the next step in the
procedure.
With even and smooth force
applied, wrench tighten according
to the 'Turns From Finger Tight'
(T.F.F.T.) values listed below.
DO NOT OVERTIGHTEN!
All quick disconnect couplings should be viewed as potential hazards that can cause property
damage, personal injury or even death if used or installed improperly!
Couplings should be installed in a location that will allow easy operation of the coupling and
accessibility for all necessary installation tools. Care should be given to consider operator
safety, especially if spillage upon disconnection could result in fluid ignition or skin and eye
irritation.
Only apply wrenches to the hex or machined wrench flats that are provided for assembly
purposes, nowhere else. Never clamp on the sleeve of the coupler or the nose of the nipple,
this will cause distortion and/or damage.
Finally, always test quick coupling installations before putting into operation by
pressurizing the unit to 125% of the working pressure in an enclosed/protective environment.
3
2
4
InstallationAttention Required!
1
Installation of Tapered Thread Connections (NPTF)
The seal for NPTF threads is created by the metal-to-metal contact between the roots and
crests of the male and female threads. Too much PTFE tape, or pairing liquid sealant with
PTFE tape may cause distortion, poor thread engagement, or cracking of the coupling during
assembly.
The total number of tapered threads engaged should be between 3½ to 6. Any number of
threads outside this range may indicate either under or over tightening of the joint or out of
tolerance threads. After assembly of a NPTF thread connection, always proof-test the
connection before operating the system. If the joint proves to be inadequately tightened during
proof-pressure testing, tighten it further in 1/8" increments until a reliable seal is attained
(do not exceed 2-3/4 T.F.F.T!)
2
2
2
1.5
1.5
SAE Size NPTF Thread Size T.F.F.T
-4
-6
-8
-12
-16
1/4" - 18
3/8" - 18
1/2" - 14
3/4" - 14
1" - 11 1/2
pages 001 - 013.pmd 8/24/2007, 10:16 AM 6