Spool Operating Parameters

The operating parameters pertaining to the 1D Spool Valve compartment template involve specifying these inputs in advanced/extended settings for solving the analytical equation of the valve. They can be accessed in Advanced Mode as follows:

Model Panel > Spool Valve

Properties Panel > Model Tab > [Desired Property]

Figure 6.778 - Spool valve model-Properties panel

The following parameters are specified to give required inputs to solve the analytical equation of Spool Valve.

Additional Force on Valve: This parameter allows to specify user defined forces for the valve with the desired value or expression. The unit is m.
Chamber Diameter: This parameter allows to specify the spool diameter with the desired value. The unit is m.
Control Fluid Volume: This parameter allows specification of the fluid volume at the control end of the valve with the desired value. The unit is m³.
Control Head Diameter: This parameter dictates the head diameter of the valve with the desired value. The unit is m.
Control Orifice Diameter: This parameter allows specification of the orifice diameter at the control end of the valve with the desired value. The unit is m.
: This parameter allows introduction of the effect of jetting on the valve dynamics with the desired value.
Damping Coefficient: This parameter allows specification of coefficient for the damping force with the desired value. The force associated with the damping coefficient opposes the direction of motion is: . The unit is N-s/m.
Discharge Coefficient: This parameter allows introduction a loss coefficient at the opening of the valve with the desired value.
End Diameter: This parameter allows specification of the diameter at the end of the valve with the desired value. The unit is m.
End Fluid Volume: This parameter allows specification of the fluid volume at the end of the valve with the desired value. The unit is m.
End Orifice Diameter: This parameter allows specification of the orifice diameter at the end of the valve with the desired value. The unit is m³.
End Pressure: This parameter dictates pressure at the outlet of the orifice at the end of the valve with the desired value. The unit is Pa.
Gas Mass Fraction: This parameter allows introduction of the effects of gas in the liquid with the desired value.
Gauge Pressure: This parameter enables including the effects of gauge pressure on the fluid compressibility with the desired value. The unit is Pa.
Liquid Bulk Modulus: This parameter enables including the effects of the liquid bulk modulus on the fluid compressibility with the desired value. The unit is Pa.
Liquid Density: This parameter enables including the effects of the liquid density on the fluid compressibility with the desired value. The unit is kg/m³.
Maximum Close Distance: This value limits the negative translation of the valve in the closing direction with the desired value. The unit is m.
Maximum Open Distance: This value limits the maximum translation of the valve with the desired value. The unit is m.
Outlet Pressure: This parameter dictates the pressure at the outlet of the spool valve with the desired value. The unit is Pa.
Spring Constant:This parameter "" is a variable in the spring force term which is given by the equation .
where is the spring preload force and the reference is the closed position. The unit is N/m.

Note: The spring force associated with the spring constant opposes an increase in the opening.

Spring Preload Force: This parameter , is a variable in the spring force term. Preload force is the force of the spring in the closed position. The spring force associated with the Spring Preload Force opposes an increase in the valve’s opening. The unit is N.
Valve Mass: This parameter “”, is the mass of the ball valve and has a unit of kg.
User Specified Area: This enables to specify the opening area. Specify the desired value of area.