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Installation of Tapered Thread Connections (NPTF)InstallationBe Be SafeSafe WhenWhen InstallingInstalling QuickQuick Couplings!Couplings! 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 Attention Required! 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. 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 3� 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!) 1 2 Apply 1� to 2 wraps of PTFE tape, Check threads to make sure there starting one or two threads from is no obvious damage on either the lead edge, in a clockwise half and that tape is properly direction. For 316 stainless steel, installed. Align male and female be sure to use stainless grade threaded connections and carefully tape. begin threading the two halves together. 3 4 Finger tighten the connection and With even and smooth force create a reference mark on the hex applied, wrench tighten according of the hose end/adapter and the to the 'Turns From Finger Tight' coupling. This mark will help (T.F.F.T.) values listed below. identify the number of revolutions DO NOT OVERTIGHTEN! during the next step in the procedure. SAE Size NPTF Thread Size T.F.F.T -4 1/4" - 18 2 -6 3/8" - 18 2 -8 1/2" - 14 2 -12 3/4" - 14 1.5 -16 1" - 11 1/2 1.5 6 Dixon Quick Coupling pages 001 - 013.pmd 6 8/24/2007, 10:16 AM Installation of Tapered Thread Connections (NPTF)
Goodyear Rubber Products
