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Hydraulic circuit

The hydraulic circuit generates friction pressure losses, which must be kept at a reasonable level.

The "Hydraulic Characteristics" section requires the selection of a pipe type (including diameter) as well as the total length of the piping.

It also allows for the inclusion of a certain number of elbows, as well as any other friction loss factors related to various hydraulic features, valves, etc.

Friction Loss Factors

Some examples of friction loss factor values for hydraulic circuits:

  • 45° elbow, standard: 0.35
  • 90° elbow, standard: 0.75
  • 90° elbow, large radius: 0.45
  • Tee, straight run, inactive branch: 0.4
  • Tee used as an elbow: 1.5
  • Globe valve, fully open: 0.17
  • Globe valve, ¾ open: 0.9
  • Globe valve, ½ open: 4.5
  • Globe valve, ¼ open: 24
  • Diaphragm valve, fully open: 2.3
  • Diaphragm valve, open ¾: 2.6
  • Diaphragm valve, open ½: 4.3
  • Diaphragm valve, open ¼: 21
  • Butterfly valve, 5°: 0.24
  • Butterfly valve, 20°: 1.54
  • Butterfly valve, 40°: 10.8
  • Butterfly valve, 60°: 11.8
  • Disc check valve: 10
  • Ball check valve: 70
  • Disc water meter: 7.0
  • Piston water meter: 15
  • Turbine water meter: 6.0