Pressure-Compensated Flow Control Valve (IL)

Flow control with pressure control in the isothermal fluid network.

blockType: EngeeFluids.IsothermalLiquid.Valves.FlowControl.PressureCompensated

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/Physical Modeling/Fluids/Isothermal Liquid/Valves & Orifices/Flow Control Valves/Pressure-Compensated Flow Control Valve (IL)

Description

Block Pressure-Compensated Flow Control Valve (IL) provides constant pressure flow control through series-connected units Orifice (IL) and Pressure Compensator Valve (IL). When the control pressure is above the hole If it reaches or exceeds the value of Set orifice pressure differential, then the reduction valve in the pressure compensator component begins to close, which maintains pressure in the opening.

For systems with the removal or redirection of liquid to another part of the system, see the block Pressure-Compensated 3-Way Flow Control Valve (IL).

The opening and closing of the valve is controlled by a signal sent to port S. A positive signal opens the valve. Flow control valve diagram:

pressure compensated flow control valve (il) 1

Numerically smoothed area and pressure

If the parameterization of the opening is linear, then the computational stability of the simulation at the extreme points of the range of the opening area and valve pressure is supported by the parameter Smoothing factor, the value of which should be greater 0 And less 1. If the Smoothing factor parameter is non-zero, then the block applies the smoothing function to all calculated areas and pressures, but first of all it affects the simulation at the extreme points of these ranges.

If anti-aliasing is enabled, the block smoothly saturates the area of the hole between the Leakage area and Maximum orifice area parameters and applies the smoothing function. The unit smooths the pressure in the valve between the parameter Set orifice pressure differential and the sum of the parameters Set orifice pressure differential and Pressure compensator valve regulation range.

Parameterization of holes

Set Orifice parameterization to:

Linear - Area vs. control member position — assumes that the position of the control element and the opening area of the hole are linearly related;
Tabulated data - Area vs. control member position — interpolates user data between the opening area of the hole and the position of the control element with a potentially nonlinear relationship;
Tabulated data - Volumetric flow rate vs. control member position and pressure drop — Interpolates the volumetric flow rate through the hole directly from user data between the position of the control element, the pressure drop at the hole and the volumetric flow rate through the hole.

Ports

Conserving

# A — Isothermal liquid port
Isothermal liquid

Details

The point of entry or exit of the liquid from the valve.

Program usage name

port_a

# B — Isothermal liquid port
Isothermal liquid

Details

The point of entry or exit of the liquid from the valve.

Program usage name

port_b

Input

# S — opening the hole, m
scalar

Details

The opening of the hole (in m), given as a scalar. A positive signal opens the hole.

Data types	`Float64`
Complex numbers support	I don’t

Parameters

# Orifice parameterization — hole modeling method
Linear - Area vs. control member position | Tabulated data - Area vs. control member position | Tabulated data - Volumetric flow rate vs. control member position and pressure drop

Details

The method of modeling the opening of the hole. The hole is either linearly parameterized, which correlates the area of the hole with the position of the control element; using user data that correlates the area of the hole with the position of the control element; or using an array of data that correlates the flow rate of the valve with the position of the control element and the pressure drop on the valve.

Values	`Linear - Area vs. control member position` \| `Tabulated data - Area vs. control member position` \| `Tabulated data - Volumetric flow rate vs. control member position and pressure drop`
Default value	`Linear - Area vs. control member position`
Program usage name	`restriction_parameterization`
Evaluatable	No

# Control member position at closed valve — displacement of the control
m | um | mm | cm | km | in | ft | yd | mi | nmi

Details

Shifting the control when the hole is fully open. A positive non-zero value indicates a partially closed hole. A negative non-zero value indicates a blocked hole that remains open at the initial offset set by the signal on port S.

Dependencies

To enable this parameter, set Orifice parameterization to Linear - area vs. control member travel.

Units	`m` \| `um` \| `mm` \| `cm` \| `km` \| `in` \| `ft` \| `yd` \| `mi` \| `nmi`
Default value	`0.0 m`
Program usage name	`min_control_displacement`
Evaluatable	Yes

# Control member travel between closed and open valve — maximum stroke of the control element
m | um | mm | cm | km | in | ft | yd | mi | nmi

Details

The stroke of the control element at which the hole is fully open.

Dependencies

To enable this parameter, set Orifice parameterization to Linear - Area vs. control member travel.

Units	`m` \| `um` \| `mm` \| `cm` \| `km` \| `in` \| `ft` \| `yd` \| `mi` \| `nmi`
Default value	`5e-3 m`
Program usage name	`delta_control_displacement`
Evaluatable	Yes

# Maximum orifice area — maximum cross-sectional area of the hole
m^2 | um^2 | mm^2 | cm^2 | km^2 | in^2 | ft^2 | yd^2 | mi^2 | ha | ac

Details

The cross-sectional area of the hole in the fully open position. This parameter is used as an upper limit for calculating the area and pressure during the simulation.

Dependencies

To enable this parameter, set Orifice parameterization to Linear - Area vs. control member travel.

Units	`m^2` \| `um^2` \| `mm^2` \| `cm^2` \| `km^2` \| `in^2` \| `ft^2` \| `yd^2` \| `mi^2` \| `ha` \| `ac`
Default value	`8e-5 m^2`
Program usage name	`max_restriction_area`
Evaluatable	Yes

# Control member position vector — vector of distances of movement of control elements
m | um | mm | cm | km | in | ft | yd | mi | nmi

Details

Vector of positions of the control element for tabular parameterization of the hole opening area. The elements of the vector must match one-to-one with the elements of the Orifice area vector parameter. The elements are listed in ascending order, and the first element should be equal to 0. Linear interpolation is used between the points of the tabular data.

Dependencies

To enable this parameter, set Orifice parameterization to Tabulated data - Area vs. control member position.

Units	`m` \| `um` \| `mm` \| `cm` \| `km` \| `in` \| `ft` \| `yd` \| `mi` \| `nmi`
Default value	`[0.0, 2e-3, 7e-3] m`
Program usage name	`control_displacement_vector_1D`
Evaluatable	Yes

# Orifice area vector — vector of the hole opening area
m^2 | um^2 | mm^2 | cm^2 | km^2 | in^2 | ft^2 | yd^2 | mi^2 | ha | ac

Details

The vector of the valve opening area for tabular parameterization of the valve opening area. The elements of the vector must match one-to-one with the elements of the Control member position vector parameter. The items are listed in ascending order and must be larger. 0.

Dependencies

To enable this parameter, set Orifice parameterization to Tabulated data - Area vs. control member position.

Units	`m^2` \| `um^2` \| `mm^2` \| `cm^2` \| `km^2` \| `in^2` \| `ft^2` \| `yd^2` \| `mi^2` \| `ha` \| `ac`
Default value	`[1e-9, 4e-9, 1e-5] m^2`
Program usage name	`restriction_area_vector_1D`
Evaluatable	Yes

# Control member position vector, s — displacement vector of the control element
m | um | mm | cm | km | in | ft | yd | mi | nmi

Details

The displacement vector of the controls for tabular parameterization of the volume flow. The position vector of the controls forms an independent axis with the parameter Pressure drop vector, dp for the dependent parameter Volumetric flow rate table, q(s,dp). A positive displacement corresponds to the opening of the valve. The values are listed in ascending order, and the first element should be equal to 0. Linear interpolation is used between the points of the tabular data.

Units	`m` \| `um` \| `mm` \| `cm` \| `km` \| `in` \| `ft` \| `yd` \| `mi` \| `nmi`
Default value	`[0.0, 2e-3, 4e-3, 7e-3, 1.7e-2] m`
Program usage name	`control_displacement_vector_2D`
Evaluatable	Yes

# Pressure drop vector, dp — vector of pressure drop values
Pa | uPa | hPa | kPa | MPa | GPa | kgf/m^2 | kgf/cm^2 | kgf/mm^2 | mbar | bar | kbar | atm | ksi | psi | mmHg | inHg

Details

A vector of differential pressure values for tabular parameterization of the valve opening area. The pressure drop vector forms an independent axis with the parameter Control member position vector, s for the dependent parameter Volumetric flow rate table, q(s,dp). The values are listed in ascending order and must be greater. 0. Linear interpolation is used between the points of the tabular data.

Units	`Pa` \| `uPa` \| `hPa` \| `kPa` \| `MPa` \| `GPa` \| `kgf/m^2` \| `kgf/cm^2` \| `kgf/mm^2` \| `mbar` \| `bar` \| `kbar` \| `atm` \| `ksi` \| `psi` \| `mmHg` \| `inHg`
Default value	`[0.3, 0.5, 0.7] MPa`
Program usage name	`delta_p_vector_2D`
Evaluatable	Yes

# Volumetric flow rate table, q(s,dp) — array of volume flow values
m^3/s | mm^3/s | cm^3/s | m^3/hr | m^3/min | l/hr | l/min | l/s | gal/hr | gal/min | gal/s | ft^3/hr | ft^3/min | ft^3/s

Details

A matrix of volumetric flow rates based on independent values of differential pressure and position of the control element. and — these are the sizes of the corresponding vectors:

— the number of elements in the parameter Pressure drop vector, dp.
— the number of elements in the parameter Control member position vector, s.

Dependencies

To enable this parameter, set Orifice parameterization to Tabulated data - Volumetric flow rate vs. control member position and pressure drop.

Units	`m^3/s` \| `mm^3/s` \| `cm^3/s` \| `m^3/hr` \| `m^3/min` \| `l/hr` \| `l/min` \| `l/s` \| `gal/hr` \| `gal/min` \| `gal/s` \| `ft^3/hr` \| `ft^3/min` \| `ft^3/s`
Default value	`[1.7e-05 2e-05 2.6e-05; 0.0035 0.0045 0.0053; 0.7 0.9 1.06; 1.96 2.5 3.0; 6.0 7.7 9.13]*1e-3 m^3/s`
Program usage name	`Vdot_matrix_2D`
Evaluatable	Yes

# Set orifice pressure differential — threshold of operation of the compensator valve
Pa | uPa | hPa | kPa | MPa | GPa | kgf/m^2 | kgf/cm^2 | kgf/mm^2 | mbar | bar | kbar | atm | ksi | psi | mmHg | inHg

Details

The amount of pressure drop that causes the valve to open or close.

Units	`Pa` \| `uPa` \| `hPa` \| `kPa` \| `MPa` \| `GPa` \| `kgf/m^2` \| `kgf/cm^2` \| `kgf/mm^2` \| `mbar` \| `bar` \| `kbar` \| `atm` \| `ksi` \| `psi` \| `mmHg` \| `inHg`
Default value	`0.6 MPa`
Program usage name	`delta_p_set`
Evaluatable	Yes

# Pressure compensator valve regulation range — working pressure range of the compensation valve
Pa | uPa | hPa | kPa | MPa | GPa | kgf/m^2 | kgf/cm^2 | kgf/mm^2 | mbar | bar | kbar | atm | ksi | psi | mmHg | inHg

Details

The operating pressure range of the valve. The pressure control range lies between Set orifice pressure differential and the maximum operating pressure of the valve.

Units	`Pa` \| `uPa` \| `hPa` \| `kPa` \| `MPa` \| `GPa` \| `kgf/m^2` \| `kgf/cm^2` \| `kgf/mm^2` \| `mbar` \| `bar` \| `kbar` \| `atm` \| `ksi` \| `psi` \| `mmHg` \| `inHg`
Default value	`0.1 MPa`
Program usage name	`p_regulation_range`
Evaluatable	Yes

# Pressure compensator valve maximum area — the area of the fully open pressure compensation valve
m^2 | um^2 | mm^2 | cm^2 | km^2 | in^2 | ft^2 | yd^2 | mi^2 | ha | ac

Details

The cross-sectional area of the valve opening in the fully open position. This parameter is used as an upper limit for calculating the area and pressure during the simulation.

Units	`m^2` \| `um^2` \| `mm^2` \| `cm^2` \| `km^2` \| `in^2` \| `ft^2` \| `yd^2` \| `mi^2` \| `ha` \| `ac`
Default value	`12e-5 m^2`
Program usage name	`max_compensator_area`
Evaluatable	Yes

# Leakage area — the gap area in the fully closed position
m^2 | um^2 | mm^2 | cm^2 | km^2 | in^2 | ft^2 | yd^2 | mi^2 | ha | ac

Details

The sum of all clearances when the valve is in the fully closed position. Any area smaller than this value is maintained at the level of the specified leakage area. This contributes to computational agility by maintaining continuity of flow.

Units	`m^2` \| `um^2` \| `mm^2` \| `cm^2` \| `km^2` \| `in^2` \| `ft^2` \| `yd^2` \| `mi^2` \| `ha` \| `ac`
Default value	`1e-10 m^2`
Program usage name	`leakage_area`
Evaluatable	Yes

# Discharge coefficient — expense ratio

Details

A correction factor that takes into account discharge losses in theoretical flows.

Default value	`0.64`
Program usage name	`C_d`
Evaluatable	Yes

# Critical Reynolds number — the upper limit of the Reynolds number in the laminar flow regime

Details

The upper limit of the Reynolds number in the laminar flow regime through the valve.

Default value	`150.0`
Program usage name	`Re_critical`
Evaluatable	Yes

# Smoothing factor — numerical smoothing factor

Details

The continuous smoothing coefficient, which introduces a level of gradual change based on the flow characteristic when the valve is in the nearly open and nearly closed positions. Set a non-zero value less than one to increase the stability of the simulation in these modes.

Default value	`0.01`
Program usage name	`smoothing_factor`
Evaluatable	Yes