Two way Directional Valve (TL)#

The Two way Directional Valve (TL) block describes the flow of isothermal liquid through the valve section, which is controlled by an external signal.

Valve opening can be parameterized linearly or using tabular data.

If Cross area calculation method is set to Linear, the hole area is determined by the expression (1) :

(1)#\[A_{отв.}=(A_{max}-A_{утеч.})\cdot S + A_{утеч.}\]

where:

\(A_{hole}\) — opening area, [m\(^2\)];

S — rod position;

\(A_{leak.}\) — leakage area at closed valve, [m\(^2\)];

\(A_{max}\) — maximum valve cross-section area, [m\(^2\)].

If Cross area calculation method is set to Table, the hole area is determined according to the stem position vector and the hole area vector by interpolation.

The \(A_{leak.}\) and \(A_{max}\) parameters are determined according to the first and last element of the hole area vector.

Law of conservation of mass (2):

(2)#\[\dot m_A+\dot m_B=0\]

Law of conservation of energy (3):

(3)#\[\phi_A+\phi_B=0\]

where:

\(\phi_A\) - energy flow at the input, [W];

\(\phi_B\) - energy flow at the output, [W].

1. Properties#

Property	Default Value	Description	Units of measurement
Cross area calculation method: Linear; Table	Linear	-	-
Valve close position	5e-3	-	m
Valve travel, available when `Cross area calculation method` - `Linear`	5e-3	-	m
Area port	0.07	-	m\(^2\)
Spool position vector, available when `Cross area calculation method` - `Table`	0;0.2;0.4;0.6;0.8;1.0	Field filling format: 0;0.2;0.4;0.6;0.8;1.0	m
Valve cross area vector, available when `Cross area calculation method` - `Table`	1e-10;2e-05;4e-05;6e-5;8e-5;1e-4	Field filling format: 0;0.2;0.4;0.6;0.8;1.0	m\(^2\)
Discharge coefficient	0.64	-	-
Reynolds critical numbers	150.0	-	-
Leakage area, available when `Cross area calculation method` - `Linear`	1e-10	-	m\(^2\)
Valve max area, available when `Cross area calculation method` - `Linear`	1e-4	-	m\(^2\)
Smoothing factor, available when `Cross area calculation method` - `Linear`	0.01	-	-

2. Inputs and outputs#

Parameters	Input/Output	Description	Units of measurement	Port type
Input	Input	-	-	Thermohydraulics
Spool displacement	Input	-	m	Automation
Output	Output	-	-	Thermohydraulics

In order to see the connection capabilities of the block, you need to go to page Description of block ports