Product(s):	Hevacomp Legacy
Version(s):	V8i
Area:	Netsys

 

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	-