Valve

Create Function

For creating a single valve:

For creating multiple valves at once:

Component Table Data

net.valve

Parameter	Datatype	Value Range	Explanation
name	string		Name of the valve
from_junction	integer	\(>\) 0	Index of junction at which the valve starts
to_junction	integer	\(>\) 0	Index of junction at which the valve ends
diameter_m	float	\(\gt\) 0	Inner diameter of the pipe [m]
opened	boolean	True / False	Indicates if the valve is opened
loss_coefficient	float	\(\geq\) 0	An additional pressure loss coefficient
type	string		Type variable to classify junctions

Physical Model

A valve is an edge component which can be used to connect or disconnect network sections. The valve can be modelled as ideal component, which is either fully open or closed causing no losses. However, a pressure loss coefficient can be imposed as well. This property considers a specific loss caused by the component when opened and models internal pressure losses. There are no losses when the component is closed.

The valve is considered as branch element with no length and is modelled accordingly.

Result Table Data

For incompressible media:

net.res_valve

Parameter	Datatype	Explanation
v_mean_m_per_s	float	The mean valve velocity [m/s]
p_from_bar	float	Pressure at “from”-junction [bar]
p_to_bar	float	Pressure at “to”-junction [bar]
t_from_k	float	Temperature at “from”-junction [K]
t_to_k	float	Temperature at “to”-junction [K]
mdot_from_kg_per_s	float	Mass flow into valve [kg/s]
mdot_to_kg_per_s	float	Mass flow out of valve [kg/s]
vdot_norm_m3_per_s	float	Norm volume flow [m^3/s]

For compressible media:

net.res_valve

Parameter	Datatype	Explanation
v_from_m_per_s	float	The velocity at the valve entry [m/s]
v_to_m_per_s	float	The velocity at the valve exit [m/s]
v_mean_m_per_s	float	The mean valve velocity [m/s]
p_from_bar	float	Pressure at “from”-junction [bar]
p_to_bar	float	Pressure at “to”-junction [bar]
t_from_k	float	Temperature at “from”-junction [K]
t_to_k	float	Temperature at “to”-junction [K]
mdot_from_kg_per_s	float	Mass flow into valve [kg/s]
mdot_to_kg_per_s	float	Mass flow out of valve [kg/s]
vdot_norm_m3_per_s	float	Norm volume flow [m^3/s]
reynolds	float	Average Reynolds number
lambda	float	Average valve friction factor
normfactor_from	float	Normfactor to calculate real gas velocity at “from”-junction (only for gas flows)
normfactor_to	float	Normfactor to calculate real gas velocity at “to”-junction (only for gas flows)