Two way Directional Valve (IH)

Block appearance in REPEAT VISION

 The Two way Directional Valve (IH) unit describes flow of isothermal liquid through the valve section, which is controlled by an external signal. The external signal supplied through the port takes on the values in the range from 0 to 1

 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 formula (1) :

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

where

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

 S — rod position;

 \(A_{leak}\) — leakage area when the valve is closed, [m\(^2\)];

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

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

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

1.  Properties

Property	Default value	Description	Units of measurement
Cross area calculation method: Linear; Tab	Linear	-	-
Valve fully open position	5e-3	-	m
Valve travel, available when Cross area calculation method - Linear	5e-3	-	m
Valve max area, available when Cross area calculation method - Linear	1e-4	-	m\(^2\)
Discharge coefficient	0.64	-	-
Reynolds critical numbers	150	-	-
Leakage area, available when Cross area calculation method - Linear	1E-10	-	m\(^2\)
Smoothing factor, available when Cross area calculation method - Linear	0.01	-	-
Area port	0.01	-	m\(^2\)
Spool position vector, available when Cross area calculation method - Tab	0;0.02;0.04;0.07;0.017	Data structure: 0;0.2;0.4;0.6;0.8;1.0	m
Valve cross area vector, available when Cross area calculation method - Tab	1e-06;1e-05;1e-04;1e-3;3e-3	Data structure: 0;0.2;0.4;0.6;0.8;1.0	m\(^2\)

2.  Inputs and outputs

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

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