Basic Parameters
Area characteristics
— Symmetry of the flow path opening characteristics
Identical for all flow paths
(default) | Different for each flow path
Choice of different or identical flow path opening characteristics.
Select Different for each flow path
to
specify flow path parameters or tabulated data separately for each
flow path.
Model parameterization
— Types of valve parameters to use as input
Maximum area and opening
(default) | Area vs. opening table
| Pressure-flow characteristic
Parameterization of the valve model. Options include:
By maximum area and opening
—
Specify the maximum orifice opening and opening area. The opening
area varies linearly with the spool displacement specified at physical
signal port S.
By area vs. opening table
—
Specify the flow path opening area at discrete orifice openings as
a 1-D lookup table. The opening area is computed by interpolation
or extrapolation of the tabulated data.
By pressure-flow characteristic
—
Specify the flow path volumetric flow rates at discrete orifice openings
and pressure differentials. The flow rate is computed by interpolation
or extrapolation of the tabulated data.
Interpolation method
— Method of computing values inside the lookup table range
Linear
(default) | Smooth
Method of computing values inside the tabulated data range.
The Linear
method joins adjacent data points
with straight line or surface segments with generally discontinuous
slope at the segment boundaries. Surface segments are used in the
2-D lookup table specified in the Pressure-flow characteristic
model
parameterization.
The Smooth
method replaces the straight
segments with curved versions that have continuous slope everywhere
inside the tabulated data range. The segments form a smooth line or
surface passing through all of the tabulated data points without the
discontinuities in first-order derivatives characteristic of the Linear
interpolation
method.
Dependencies
This parameter is active when the Model Parameterization parameter
is set to By area vs. opening table
or Pressure-flow
characteristic
.
Extrapolation method
— Method of computing values outside of the lookup table range
Linear
(default) | Nearest
Method of computing values outside of the tabulated data range.
The Linear
method extends the line segment drawn
between the last two data points at each end of the data range outward
with a constant slope.
The Nearest
method extends the last
data point at each end of the data range outward as a horizontal line
with constant value.
Dependencies
This parameter is active when the Model Parameterization parameter
is set to By area vs. opening table
or Pressure-flow
characteristic
.
Flow discharge coefficient
— Semi-empirical parameter for valve capacity characterization
0.7
(default) | unitless scalar between 0 and 1
Ratio of the actual and theoretical flow rates through the valve.
This parameter depends on the geometrical properties of the valve.
Values are usually provided in textbooks and manufacturer data sheets.
Dependencies
This parameter is active when the Model Parameterization parameter
is set to By maximum area and opening
or By
area vs. opening table
.
Leakage area
— Internal leakage area between valve inlets
1e-12
m^2
(default) | positive scalar in units of area
Total area of internal leaks in the completely closed state.
The purpose of this parameter is to maintain the numerical integrity
of the fluid network by preventing a portion of that network from
becoming isolated when the valve is completely closed.
Dependencies
This parameter is active when the Model Parameterization parameter
is set to By maximum area and opening
or By
area vs. opening table
.
Laminar transition specification
— Choice of parameter used to define the laminar-turbulent transition
Pressure ratio
(default) | Reynolds number
Select the parameter to base the laminar-turbulent transition
on. Options include:
Pressure ratio
—
Flow transitions between laminar and turbulent at the pressure ratio
specified in the Laminar flow pressure ratio parameter.
Use this option for the smoothest and most numerically robust flow
transitions.
Reynolds number
—
The transition occurs at the Reynolds number specified in the Critical
Reynolds number parameter. Flow transitions are more abrupt
and can cause simulation issues at near-zero flow rates.
Dependencies
This parameter is active when the Model Parameterization parameter
is set to By maximum area and opening
or By
area vs. opening table
.
Laminar flow pressure ratio
— Pressure ratio at the laminar-turbulent flow transition
0.999
(default) | unitless scalar between 0 and 1
Pressure ratio at which the flow transitions between the laminar
and turbulent regimes. The pressure ratio is the fraction of the outlet
pressure over the inlet pressure.
Dependencies
This parameter is active when the Model Parameterization parameter
is set to By maximum area and opening
or By
area vs. opening table
and the Laminar transition
specification parameter is set to Reynolds
number
.
Critical Reynolds number
— Reynolds number at the laminar-turbulent flow transition
12
(default) | unitless positive scalar
Maximum Reynolds number for laminar flow. This parameter depends
on the orifice geometrical profile. You can find recommendations on
the parameter value in hydraulics textbooks. The default value, 12
,
corresponds to a round orifice in thin material with sharp edges.
Dependencies
This parameter is active when the Model Parameterization parameter
is set to By maximum area and opening
or By
area vs. opening table
and the Laminar transition
specification parameter is set to Reynolds
number
.
Model Parameterization: Maximum area and opening
Maximum opening
— Orifice opening at which the opening area is a maximum
0.005 m
(default) | positive scalar with units of length
Orifice opening at which the opening area of a flow path is
a maximum. The maximum opening is the same for all flow paths when
this parameter is exposed. For the orifice opening definitions, see Orifice Openings.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Identical for all flow paths
and
the Model parameterization parameter is set to Maximum
area and opening
.
Maximum opening area
— Maximum cross-sectional area of a flow path
0.5e-4 m^2
(default) | positive scalar with units of area
Maximum cross-sectional area of a flow path. The maximum opening
areas are the same for all paths when this parameter is exposed. For
the opening area calculations, see Opening Areas.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Identical for all flow paths
and
the Model parameterization parameter is set to Maximum
area and opening
.
P-A, maximum opening
— P-A
orifice opening at which the opening area is a maximum
0.005 m
(default) | positive scalar with units of length
Control member position at which the P-A opening area is equal
to the P-A, maximum opening area parameter value.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Maximum
area and opening
.
P-A, maximum opening area
— Maximum flow area of the P-A flow path
0.5e-4 m^2
(default) | positive scalar with units of area
Maximum cross-sectional area of the P-A flow
path. The maximum opening areas are different for each flow path when
this parameter is exposed. For the opening area calculations, see Opening Areas.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Maximum
area and opening
.
P-B, maximum opening
— P-B
Orifice opening at which the opening area is a maximum
0.005 m
(default) | positive scalar with units of length
Control member position at which the P-B opening area is equal
to the P-B, maximum opening area parameter value.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Maximum
area and opening
.
P-B, maximum opening area
— Maximum flow area of the P-B flow path
0.5e-4 m^2
(default) | positive scalar with units of area
Maximum cross-sectional area of the P-B flow
path. The maximum opening areas are different for each flow path when
this parameter is exposed. For the opening area calculations, see Opening Areas.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Maximum
area and opening
.
A-T, maximum opening
— A-T
Orifice opening at which the opening area is a maximum
0.005 m
(default) | positive scalar with units of length
Control member position at which the A-T opening area is equal
to the A-T, maximum opening area parameter value.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Maximum
area and opening
.
A-T, maximum opening area
— Maximum flow area of the A-T flow path
0.5e-4 m^2
(default) | positive scalar with units of area
Maximum cross-sectional area of the A-T flow
path. The maximum opening areas are different for each flow path when
this parameter is exposed. For the opening area calculations, see Opening Areas.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Maximum
area and opening
.
B-T, maximum opening
— B-T
Orifice opening at which the opening area is a maximum
0.005 m
(default) | positive scalar with units of length
Control member position at which the B-T opening area is equal
to the B-T, maximum opening area parameter value.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Maximum
area and opening
.
B-T, maximum opening area
— Maximum flow area of the B-T flow path
0.5e-4 m^2
(default) | positive scalar with units of area
Maximum cross-sectional area of the B-T flow
path. The maximum opening areas are different for each flow path when
this parameter is exposed. For the opening area calculations, see Opening Areas.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Maximum
area and opening
.
Model Parameterization: Area vs. opening table
Opening vector
— Orifice openings at which to specify the flow path opening areas
[-0.002, 0.0, 0.002, 0.005, 0.015]
m
(default) | numerical array with units of length
Array of orifice openings used to construct the opening area
1-D lookup table for all flow paths. The opening characteristics are
identical for all flow paths when this parameter is exposed. The number
of elements in the array determines the number of elements in the
table.
The array must increase from left to right but the intervals
between the array element values need not be uniform. There must be
at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Identical for all flow paths
and
the Model parameterization parameter is set to Area
vs. opening table
.
Opening area vector
— Opening areas corresponding to the orifice openings specified in the Opening vector
parameter
[1.0e-9, 2.0352e-7, 4.0736e-5, 0.00011438,
0.00034356] m^2
(default) | numerical array with units of area
Array of flow path opening areas corresponding to the specified
orifice openings. The opening characteristics are identical for all
flow paths when this parameter is exposed. The number of elements
in the array must match the number of elements in the Opening
vector parameter.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Identical for all flow paths
and
the Model parameterization parameter is set to Area
vs. opening table
.
P-A, opening vector
— P-A
orifice openings at which to specify the P-A
opening area
[-0.002, 0.0, 0.002, 0.005, 0.015]
m
(default) | numerical array with units of length
Array of P-A orifice openings used to construct
the opening area 1-D lookup table for the P-A flow
path. The number of elements in the array determines the number of
elements in the table.
The array must increase from left to right but the intervals
between the array element values need not be uniform. There must be
at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Area
vs. opening table
.
P-A, opening area vector
— P-A
opening areas corresponding to the orifice openings specified in the P-A, opening vector
parameter
[1.0e-9, 2.0352e-7, 4.0736e-5, 0.00011438,
0.00034356] m^2
(default) | numerical array with units of area
Array of P-A opening areas corresponding
to the specified P-A orifice openings. The number
of elements in the array must match the number of elements in the P-A,
opening vector parameter.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Area
vs. opening table
.
P-B, opening vector
— P-B
orifice openings at which to specify the P-B
opening area
[-0.002, 0.0, 0.002, 0.005, 0.015]
m
(default) | numerical array with units of length
Array of P-B orifice openings used to construct
the opening area 1-D lookup table for the P-B flow
path. The number of elements in the array determines the number of
elements in the table.
The array must increase from left to right but the intervals
between the array element values need not be uniform. There must be
at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Area
vs. opening table
.
P-B, opening area vector
— P-B
opening areas corresponding to the orifice openings specified in the P-B, opening vector
parameter
[1.0e-9, 2.0352e-7, 4.0736e-5, 0.00011438,
0.00034356] m^2
(default) | numerical array with units of area
Array of P-B opening areas corresponding
to the specified P-B orifice openings. The number
of elements in the array must match the number of elements in the P-B,
opening vector parameter.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Area
vs. opening table
.
A-T, opening vector
— A-T
orifice openings at which to specify the A-T
opening area
[-0.002, 0.0, 0.002, 0.005, 0.015]
m
(default) | numerical array with units of length
Array of A-T orifice openings used to construct
the opening area 1-D lookup table for the A-T flow
path. The number of elements in the array determines the number of
elements in the table.
The array must increase from left to right but the intervals
between the array element values need not be uniform. There must be
at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Area
vs. opening table
.
A-T, opening area vector
— A-T
opening areas corresponding to the orifice openings specified in the A-T, opening vector
parameter
[1.0e-9, 2.0352e-7, 4.0736e-5, 0.00011438,
0.00034356] m^2
(default) | numerical array with units of area
Array of A-T opening areas corresponding
to the specified A-T orifice openings. The number
of elements in the array must match the number of elements in the A-T,
opening vector parameter.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Area
vs. opening table
.
B-T, opening vector
— B-T
orifice openings at which to specify the B-T
opening area
[-0.002, 0.0, 0.002, 0.005, 0.015]
m
(default) | numerical array with units of length
Array of B-T orifice openings used to construct
the opening area 1-D lookup table for the B-T flow
path. The number of elements in the array determines the number of
elements in the table.
The array must increase from left to right but the intervals
between the array element values need not be uniform. There must be
at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Area
vs. opening table
.
B-T, opening area vector
— B-T
opening areas corresponding to the orifice openings specified in the B-T, opening vector
parameter
[1.0e-9, 2.0352e-7, 4.0736e-5, 0.00011438,
0.00034356] m^2
(default) | numerical array with units of area
Array of B-T opening areas corresponding
to the specified B-T orifice openings. The number
of elements in the array must match the number of elements in the B-T,
opening vector parameter.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Area
vs. opening table
.
Model Parameterization: Pressure-flow characteristic
Opening vector, s
— Orifice openings at which to specify the flow rate tabulated data
[-0.002, 0.0, 0.002, 0.005, 0.015]
m
(default) | numerical array with units of length
Array of orifice openings used to construct the volumetric flow
rate 2-D lookup table. The number of elements in the array determines
the number of rows in the table. The array must increase from left
to right but the intervals between the array element values need not
be uniform. There must be at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Identical for all flow paths
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
Pressure differential vector, dp
— Pressure differentials at which to specify the flow rate data
[-10000000.0, -5000000.0, -2000000.0,
2000000.0, 5000000.0, 10000000.0] Pa
(default) | numerical array with units of pressure
Array of pressure differentials used to construct the volumetric
flow rate 2-D lookup table. The number of elements in the array determines
the number of columns in the table. The array must increase from left
to right but the intervals between the array element values need not
be uniform. There must be at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Identical for all flow paths
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
Volumetric flow rate table, q(s,dp)
— Volumetric flow rates at the specified control member displacements and pressure differentials
5-by-6 matrix with elements between -0.0344
and 0.0344
m^3/s
(default) | numerical array with units of length
Matrix with the volumetric flow rates corresponding to the specified
orifice openings and pressure differentials. The number of rows must
match the number of elements in the Opening vector, s parameter.
The number of columns must match the number of elements in the Pressure
differential vector, dp parameter.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Identical for all flow paths
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
P-A, opening vector, s
— Orifice openings at which to specify the P-A
flow rate data
[-0.002, 0.0, 0.002, 0.005, 0.015]
m
(default) | numerical array with units of length
Array of P-A orifice openings used to construct
the P-A volumetric flow rate 2-D lookup table.
The number of elements in the array determines the number of rows
in the table. The array must increase from left to right but the intervals
between the array element values need not be uniform. There must be
at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
P-A, pressure differential vector, dp
— Pressure differentials at which to specify the flow rate data for the P-A flow path
[-10000000.0, -5000000.0, -2000000.0,
2000000.0, 5000000.0, 10000000.0] Pa
(default) | numerical array with units of pressure
Array of pressure differentials used to construct the volumetric
flow rate 2-D lookup table for the P-A flow path. The number of elements
in the array determines the number of columns in the table.
The array must increase from left to right but the intervals
between the array element values need not be uniform. There must be
at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
P-A, volumetric flow rate table, q(s,dp)
— Volumetric flow rates at the specified control member displacements and pressure differentials for the P-A flow path
5-by-6 matrix with elements between -0.0344
and 0.0344
m^3/s
(default) | numerical array with units of length
Matrix with the volumetric flow rates through the P-A flow path
at the specified control member displacements and pressure differentials.
The number of rows must match the number of elements in the P-A,
opening vector, s parameter. The number of columns must
match the number of elements in the P-A, pressure differential
vector, dp parameter.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
P-B, opening vector, s
— Control member displacements at which to specify the flow rate data for the P-B flow path
[-0.002, 0.0, 0.002, 0.005, 0.015]
m
(default) | numerical array with units of length
Array of control member displacements used to construct the
volumetric flow rate 2-D lookup table for the P-B flow path. The number
of elements in the array determines the number of rows in the table.
The array must increase from left to right but the intervals
between the array element values need not be uniform. There must be
at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
P-B, pressure differential vector, dp
— Pressure differentials at which to specify the flow rate data for the P-B flow path
[-10000000.0, -5000000.0, -2000000.0,
2000000.0, 5000000.0, 10000000.0] Pa
(default) | numerical array with units of pressure
Array of pressure differentials used to construct the volumetric
flow rate 2-D lookup table for the P-B flow path. The number of elements
in the array determines the number of columns in the table.
The array must increase from left to right but the intervals
between the array element values need not be uniform. There must be
at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
P-B, volumetric flow rate table, q(s,dp)
— Volumetric flow rates at the specified control member displacements and pressure differentials for the P-B flow path
5-by-6 matrix with elements between -0.0344
and 0.0344
m^3/s
(default) | numerical array with units of length
Matrix with the volumetric flow rates through the P-B flow path
at the specified control member displacements and pressure differentials.
The number of rows must match the number of elements in the P-B,
opening vector, s parameter. The number of columns must
match the number of elements in the P-A, pressure differential
vector, dp parameter.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
A-T, opening vector, s
— Control member displacements at which to specify the flow rate data for the A-T flow path
[-0.002, 0.0, 0.002, 0.005, 0.015]
m
(default) | numerical array with units of length
Array of control member displacements used to construct the
volumetric flow rate 2-D lookup table for the A-T flow path. The number
of elements in the array determines the number of rows in the table.
The array must increase from left to right but the intervals
between the array element values need not be uniform. There must be
at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
A-T, pressure differential vector, dp
— Pressure differentials at which to specify the flow rate data for the A-T flow path
[-10000000.0, -5000000.0, -2000000.0,
2000000.0, 5000000.0, 10000000.0] Pa
(default) | numerical array with units of pressure
Array of pressure differentials used to construct the volumetric
flow rate 2-D lookup table for the A-T flow path. The number of elements
in the array determines the number of columns in the table.
The array must increase from left to right but the intervals
between the array element values need not be uniform. There must be
at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
A-T, volumetric flow rate table, q(s,dp)
— Volumetric flow rates at the specified control member displacements and pressure differentials for the A-T flow path
5-by-6 matrix with elements between -0.0344
and 0.0344
m^3/s
(default) | numerical array with units of length
Matrix with the volumetric flow rates through the A-T flow path
at the specified control member displacements and pressure differentials.
The number of rows must match the number of elements in the A-T,
opening vector, s parameter. The number of columns must
match the number of elements in the A-T, pressure differential
vector, dp parameter.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
B-T, opening vector, s
— Control member displacements at which to specify the flow rate data for the B-T flow path
[-0.002, 0.0, 0.002, 0.005, 0.015]
m
(default) | numerical array with units of length
Array of control member displacements used to construct the
volumetric flow rate 2-D lookup table for the B-T flow path. The number
of elements in the array determines the number of rows in the table.
The array must increase from left to right but the intervals
between the array element values need not be uniform. There must be
at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
B-T, pressure differential vector, dp
— Pressure differentials at which to specify the flow rate data for the B-T flow path
[-10000000.0, -5000000.0, -2000000.0,
2000000.0, 5000000.0, 10000000.0] Pa
(default) | numerical array with units of pressure
Array of pressure differentials used to construct the volumetric
flow rate 2-D lookup table for the B-T flow path. The number of elements
in the array determines the number of columns in the table.
The array must increase from left to right but the intervals
between the array element values need not be uniform. There must be
at least two elements for Linear
interpolation
and three elements for Smooth
interpolation.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
B-T, volumetric flow rate table, q(s,dp)
— Volumetric flow rates at the specified control member displacements and pressure differentials for the B-T flow path
5-by-6 matrix with elements between -0.0344
and 0.0344
m^3/s
(default) | numerical array with units of length
Matrix with the volumetric flow rates through the B-T flow path
at the specified control member displacements and pressure differentials.
The number of rows must match the number of elements in the B-T,
opening vector, s parameter. The number of columns must
match the number of elements in the B-T, pressure differential
vector, dp parameter.
Dependencies
This parameter is active when the Area characteristics parameter
is set to Different for each flow path
and
the Model parameterization parameter is set to Pressure-flow
characteristic
.
Valve Opening Offsets
Between P-A
— P-A
orifice opening at zero spool displacement
0 m
(default) | scalar number with units of lengths
Orifice opening of the P-A flow path at
zero spool displacement. Specify a positive offset to model an underlapped
valve or a negative offset to model an overlapped valve. The default
value of 0
corresponds to a zero-lapped valve.
Between P-B
— P-B
orifice opening at zero spool displacement
0 m
(default) | scalar number with units of lengths
Orifice opening of the P-B flow path at
zero spool displacement. Specify a positive offset to model an underlapped
valve or a negative offset to model an overlapped valve. The default
value of 0
corresponds to a zero-lapped valve.
Between A-T
— A-T
orifice opening at zero spool displacement
0 m
(default) | scalar number with units of length
Orifice opening of the A-T flow path at
zero spool displacement. Specify a positive offset to model an underlapped
valve or a negative offset to model an overlapped valve. The default
value of 0
corresponds to a zero-lapped valve.
Between B-T
— BT
orifice opening at zero spool displacement
0 m
(default) | scalar number with units of length
Orifice opening of the P-B flow path at
zero spool displacement. Specify a positive offset to model an underlapped
valve or a negative offset to model an overlapped valve. The default
value of 0
corresponds to a zero-lapped valve.