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Flared Connectors
Flareless-Tube Connectors

Fluid Power - Intro to Hydraulics, Pneumatics, and how it all works
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threaded  ports  in  pumps,  valves,  and  other components.  Several  of  these  thread  combinations are  shown  in  figure  5-16. Tubing  used  with  flare  connectors  must  be flared  prior  to  assembly.  The  nut  fits  over  the sleeve and when tightened, it draws the sleeve and tubing flare tightly against the male fitting to form a seal. The  male  fitting  has  a  cone-shaped  surface with the same angle as the inside of the flare. The sleeve  supports  the  tube  so  vibration  does  not concentrate at the edge of the flare, and distributes the shearing action over a wider area for added strength.  Tube  flaring  is  covered  in  Tools   and Their  Uses,  NAVEDTRA   10085   (series),   and other  applicable  training  manuals. Correct  and  incorrect  methods  of  installing flared-tube  connectors  are  illustrated  in  figure 5-17.  Tubing  nuts  should  be  tightened  with  a torque wrench to the value specified in applicable technical  publications. If  an  aluminum  alloy  flared  connector  leaks after  being  tightened  to  the  required  torque,  it must not be tightened further. Overtightening may severely damage or completely cut off the tubing flare or may result in damage to the sleeve or nut. The  leaking  connection  must  be  disassembled  and the  fault  corrected. If  a  steel  tube  connection  leaks,  it  may  be tightened 1/6 turn beyond the specified torque in an attempt to stop the leakage; then if it still leaks, it must be disassembled and repaired. Undertightening  of  connections  may  be serious, as this can allow the tubing to leak at the connector bemuse of insufficient grip on the flare by  the  sleeve.  The  use  of  a  torque  wrench  will prevent undertightening. CAUTION A nut should never be tightened when there is pressure in the line, as this will tend to damage the connection without adding any appreciable torque to the connection. Figure 5-17.—Correct and incorrect methods of installing flared fittings. 5-14







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