2-way flow control valve in an isothermal system
Simscape / Fluids / Isothermal Liquid / Valves & Orifices / Directional Control Valves
The 2-Way Directional Valve (IL) block models a two-way valve, such as a shut-off valve. Use this block when you need a flow-reducing control element that responds to pressures in another part of the system.
Within an isothermal fluid system, the two-way directional valve provides flow control by a variable orifice. The block controls the flow between ports A and B via a physical signal at port S, which triggers spool motion to open or close the valve. For more details on the calculation of the flow rate through a variable orifice, see Orifice (IL).
The valve opening is parameterized in three ways:
Linear - area vs. spool travel
The opening area is a linear function of the spool travel distance, the signal received at port S:
where:
Aorifice is the opening area.
ΔS is the spool travel distance.
ΔSmax is the Spool travel between closed and open orifice.
ALeak is the Leakage area.
Amax is the Maximum orifice area.
Tabulated data - Area vs. spool travel
Provide spool travel vectors for your system or for individual flow paths between ports A and B. This data will be used to calculate the relationship between the orifice opening area and spool travel distance. Interpolation is used to determine the opening area between given data points. Aleak and Amax are the first and last parameters of the Opening area vector, respectively.
Tabulated data - Volumetric flow rate vs. spool travel
and pressure drop
Provide spool travel and pressure drop vectors. The volumetric flow rate is calculated based on the relationship between pressure change and the spool travel distance. Interpolation is used to determine flow rate between given data points. The mass flow rate is the product of the volumetric flow rate and the local density.
3-Way Directional Valve (IL) | 4-Way Directional Valve (IL) | Orifice (IL) | Pressure-Compensated 3-Way Flow Control Valve (IL)