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Hevacomp Wiki Pipe and Duct fittings - K values
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    Pipe and Duct fittings - K values

      Product(s): Hevacomp Mechanical Designer
      Version(s): V8i
      Environment: N/A
      Area: Netsys
      Subarea: N/A

    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 -

      

     

    • k-value
    • pipe sizing
    • Duct sizing
    • Hevacomp
    • K
    • fittings
    • kvalue
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    • Duncan Brown Created by Duncan Brown
    • When: Mon, Nov 3 2014 9:43 AM
    • Shane Regan Last revision by Bentley Colleague Shane Regan
    • When: Fri, Oct 21 2016 10:13 AM
    • Revisions: 8
    • Comments: 0
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