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Types of Fittings and Connectors
Figure 5-17.Correct and incorrect methods of installing flared fittings.

Fluid Power - Intro to Hydraulics, Pneumatics, and how it all works
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specifications   which   define   the   materials   and techniques. BRAZED  CONNECTORS Silver-brazed  connectors  are  commonly  used for  joining  nonferrous  (copper,  brass,  and  soon) piping  in  the  pressure  and  temperature  range where  their  use  is  practical.  Use  of  this  type  of connector is limited to installations in which the piping temperature will not exceed 425°F and the pressure  in  cold  lines  will  not-exceed  3,000  psi. The alloy is melted by heating the joint with an oxyacetylene  torch.  This  causes  the  alloy  insert to  melt  and  fill  the  few  thousandths  of  an  inch annular space between the pipe and the fitting. A fitting of this type which has been removed from  a  piping  system  can  be  rebrazed  into  a system, as in most cases sufficient alloy remains in the insert groove for a second joint. New alloy inserts may be obtained for fittings which do not have  sufficient  alloy  remaining  in  the  insert  for making  a  new  joint. FLARED  CONNECTORS Flared connectors are commonly used in fluid power  systems  containing  lines  made  of  tubing. These  connectors  provide  safe,  strong,  dependable connections  without  the  need  for  threading, welding,  or  soldering  the  tubing.  The  connector consists of a fitting, a sleeve, and a nut (fig. 5-15). The fittings are made of steel, aluminum alloy, or bronze. The fitting used in a connection should be made of the same material as that of the sleeve, the  nut,  and  the  tubing.  For  example,  use  steel connectors with steel tubing and aluminum alloy Figure 5-15.—Flared-tube fitting. connectors with aluminum alloy tubing. Fittings are   made   in   union,   45-degree   and   90-degree elbow,  tee,  and  various  other  shapes  (fig.  5-16). Tees,  crosses,  and  elbows  are  self-explanatory. Universal and bulkhead fittings can be mounted solidly  with  one  outlet  of  the  fitting  extending through a bulkhead and the other outlet(s) posi- tioned at any angle. Universal means the fitting can  assume  the  angle  required  for  the  specific installation.  Bulkhead  means  the  fitting  is  long enough   to   pass   through   a   bulkhead   and   is designed  so  it  can  be  secured  solidly  to  the bulkhead. For  connecting  to  tubing,  the  ends  of  the fittings are threaded with straight machine threads to correspond with the female threads of the nut. In some cases, however, one end of the fitting may be  threaded  with  tapered  pipe  threads  to  fit Figure 5-16.—Flared-tube fittings. 5-13







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