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Pipe and Duct fittings - K values

   
  Applies To 
   
  Product(s): Hevacomp Mechanical Designer
  Version(s): All
  Environment:  N/A
  Area:  N/A
  Subarea:  N/A
  Original Author: Bentley Technical Support Group
   

 

 

 

 

 

 

 

 

Overview

K values for fittings are considered when pressure drop per meter is calculated for pipe or duct sections.  

Pipe fittings

Fitting name     K value type    Single K value         15mm             25mm             50mm         > 50mm 
Gate valve    banded  -   0.5 0.3 0.2 0.1
Globe valve    banded  - 12.0 7.0 5.0 4.0
Oblique valve    banded  -   3.0 1.8 1.3 1.0
Offset    banded  -   3.2 3.2 2.8 2.4
Non-return valve    single   2.0 - - - -
Butterfly valve    single   0.3 - - - -
Plug valve    single   1.0 - - - -
Cock    single 10.0 - - - -
Diaphragm valve    single   2.5 - - - -
Strainer    single   2.0 - - - -
Commissioning set       user defined  - - - - -
Automatic valve user defined - - - - -
Radiator/Emitter user defined - - - - -

 

Duct fittings

    Fitting name    K value type Single K value
Damper - Normal    single 0.5
Damper - Streamlined    single 0.2
Damper - Motorised single 0.2
Damper - fire none 0.0
Attenuator user defined    -
Heater user defined -
Cooler user defined -
Filter user defined -
Mesh obstruction single 1.0
Perforated sheet single 2.0
Depression down single 0.4
Depression up single 0.4
Offset down single 0.3
Offset up single 0.3
Diffuser user defined -

  

See Also

Product TechNotes and FAQs

Building Product TechNotes And FAQs

External Links

Bentley homepage

HevacompMechanical Designer

Bentley Technical Support KnowledgeBase

Bentley LEARN Server

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