8
Cutting/Flaring the pipes
1. Make sure that you have the required tools available. (pipe cutter, reamer, aring tool and pipe holder)
2. If you wish to shorten the pipes, cut it with a pipe cutter, taking care to ensure that the cut edge remains at a 90° angle with the
side of the pipe. Refer to the illustrations below for examples of edges cut correctly and incorrectly.
Oblique Rough
Burr
Pipe cutter
Pipe
3. To prevent any gas from leaking out, remove all burrs at the cut edge of the pipe, using a reamer.
4. Slide a are nut on to the pipe and modify the are.
Outer Diameter (D) Depth (A)
mm inch mm inch
ø6.35 1/4 1.3 0.05
ø9.52 3/8 1.8 0.07
ø12.70 1/2 2.0 0.08
ø15.88 5/8 2.2 0.09
ø19.05 3/4 2.2 0.09
Pipe
Flare
5. Check that the aring is correct, referring to the illustrations below for examples of incorrect aring.
Uneven
Thickness
CrackedDamaged SurfaceInclinedCorrect
6. Align the pipes and tighten the are nuts rst manually and then with a torque wrench, applying the following torque.
Valve
Flare nut Valve cap Pressure port cap Valve needle Pressure port
Wrench(mm) /tN Wrench(mm) /tN Wrench(mm) /tN Wrench(mm) /tN Wrench(mm) /tN
1/4" 17 18 23 20 18 16~18 Allen(hex.) 5 9 - 0.34
3/8" 22 42 23 20 18 16~18 Allen(hex.) 5 9 - 0.34
1/2" 26 55 29 40 18 16~18 Allen(hex.) 5 13 - 0.34
5/8" 29 65 29 40 18 16~18 Allen(hex.) 5 13 - 0.34
3/4" 36 100 38 40 18 16~18 Allen(hex.) 5 13 - 0.34
t If the pipes require brazing, ensure that OFN (Oxygen Free Nitrogen) is owing through the system. If it is not
owing,Comp or valve can be damaged.
t Nitrogen blowing pressure range is 0.02 ~ 0.05MPa.
CAUTION
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