Valves and Orifices
R2026bUse these blocks to model orifices, valves, valve actuators, and forces associated with valves and orifices in the isothermal liquid domain.
Simscape Blocks
 | 2-Way Directional Valve (IL) | 2-way flow control valve in an isothermal liquid systems |
 | 3-Way Directional Valve (IL) | 3-way flow control valve in an isothermal liquid system |
 | 4-Way 2-Position Directional Valve (IL) | 4-way 2-position directional valve in an isothermal liquid network |
 | 4-Way 3-Position Directional Valve (IL) | 4-way, 3-position directional valve in an isothermal liquid system |
 | M-Way N-Position Directional Valve (IL) | M-way, N-position valve in an isothermal liquid network (Since R2022b) |
 | Check Valve (IL) | Check valve in an isothermal liquid system |
 | Pilot-Operated Check Valve (IL) | Check valve with pilot pressure control in an isothermal liquid system |
 | Shuttle Valve (IL) | One-way switching valve in an isothermal liquid system |
 | Solenoid Valve (IL) | Solenoid valve in an isothermal liquid system (Since R2023a) |
 | Ball Valve (IL) | Ball valve in an isothermal liquid network (Since R2022b) |
 | Cartridge Valve Insert (IL) | Cartridge flow-control valve in an isothermal liquid network |
 | Gate Valve (IL) | Gate valve in an isothermal liquid system |
 | Needle Valve (IL) | Needle valve in an isothermal liquid system |
 | Poppet Valve (IL) | Poppet valve in an isothermal liquid network |
 | Pressure-Compensated 3-Way Flow Control Valve (IL) | 3-way flow control in an isothermal liquid system |
 | Pressure-Compensated Flow Control Valve (IL) | Flow control with pressure regulation in an isothermal liquid system |
 | Hydromechanical Valve Interface (IL-PB) | Interface between hydromechanical valve composite port and node ports (Since R2026b) |
 | Poppet with Seat at B (IL-PB) | Poppet with seat at port B for hydromechanical valves (Since R2026b) |
 | Poppet with Seat at F (IL-PB) | Poppet with seat at port F for hydromechanical valves (Since R2026b) |
 | Valve Piston (IL-PB) | Valve piston for hydromechanical valves (Since R2026b) |
 | Valve Port with Land (IL-PB) | Valve port with land for hydromechanical valves (Since R2026b) |
 | Valve Port with Land Edge at B (IL-PB) | Valve port with land edge at port B for hydromechanical valves (Since R2026b) |
 | Valve Port with Land Edge at F (IL-PB) | Valve port with land edge at port F for hydromechanical valves (Since R2026b) |
 | Valve Section with Detached Shaft (IL-PB) | Valve section with detached shaft for hydromechanical valves (Since R2026b) |
 | Valve Section with End Cap at B (IL-PB) | Valve section with end cap at port B for hydromechanical valves (Since R2026b) |
 | Valve Section with End Cap at F (IL-PB) | Valve section with end cap at port F for hydromechanical valves (Since R2026b) |
 | Valve Section with Rigid Shaft (IL-PB) | Valve section with rigid shaft for hydromechanical valves (Since R2026b) |
 | Valve Section with Valve Port (IL-PB) | Valve section with valve port for hydromechanical valves (Since R2026b) |
 | Annular Leakage (IL) | Models annular leakage between a circular tube and a round insert in an isothermal flow |
 | Orifice (IL) | Constant-area or variable-area orifice in an isothermal liquid system |
 | Spool Orifice (IL) | Variable-area spool orifice in an isothermal liquid system |
 | Variable Overlapping Orifice (IL) | Orifice created by open segments with variable overlap in an isothermal liquid system |
 | Counterbalance Valve (IL) | High-pressure regulation valve in an isothermal liquid system |
 | Pressure Relief Valve (IL) | Pressure-relief valve in an isothermal liquid network |
 | Pressure-Reducing Valve (IL) | Pressure-reducing valve in an isothermal liquid network |
 | Pressure-Reducing 3-Way Valve (IL) | Combined pressure-relief and pressure-reducing valve in an isothermal liquid system |
 | Pressure Compensator Valve (IL) | Pressure compensator valve in an isothermal liquid network |
 | Cartridge Valve Actuator (IL) | Actuator that maintains equilibrium between valve and pilot pressures in an isothermal liquid system |
 | Double-Acting Servo Valve Actuator (IL) | Double-acting servo cylinder with spring-centered spool in an isothermal liquid system |
 | Pilot Valve Actuator (IL) | Single-acting or double-acting actuator controlled by a pilot pressure in an isothermal liquid network |
 | Spool Orifice Flow Force (IL) | Axial fluid force on spool orifice in an isothermal liquid system |
 | Multiposition Valve Actuator | Multiposition actuator in any fluid domain |
 | Proportional Valve Actuator | Power-controlled valve actuator in any fluid domain |
Topics
- Modeling Directional Valves in Simscape Fluids
Selecting and parameterizing directional control valves in Simscape™ Fluids™.
- Building a Custom Valve
Model a custom valve with orifice blocks.
- Parameterize an M-Way N-Position Valve
Use a data sheet to parameterize an M-Way N-Position Valve (IL).
- Get Started with the Hydromechanical Valve Library
Fundamentals for using the Hydromechanical Valve library.
Featured Examples
Priority Valve Controlling Two Hydraulic Motors
A pressure-compensated 3-way flow control valve. This valve maintains constant flow rate through the main hydraulic motor, which is connected to the pressure-compensated outlet of the flow control valve. It acts as a priority valve, diverting the excess flow to the auxiliary hydraulic motor if the main hydraulic motor receives enough fluid to maintain a preset angular velocity. The auxiliary motor is shut off completely if there is insufficient flow to power the main hydraulic motor.
Hydraulic Flow Rectifier Circuit
A flow rectifier circuit with four check valves and a flow control valve. It is used to allow a single flow control valve to control fluid flow in both directions. Similar to a Graetz circuit implemented with diodes, the check valves are arranged in such a way that flow always passes through the flow control valve in the same direction. In the Orifices subsystem, there are two more check valves that are used to select the orifice that the flow passes through depending on the flow direction.
4-Way 3-Position Valve Parameterization
Parameterize and test a 4-way 3-position valve with a test harness. A plotting script compares the output flow between the block and data to verify the test harness.
Hydrostatic CVT
Model, parameterize, and test a hydrostatic continuously variable transmission (CVT) with a swash angle shift command. When you run the plot function, it generates a comparison plot between the engine and the achieved rotational velocity in the hydraulic axial piston motor with respect to the time. Construction and agricultural equipment manufacturers use these transmissions.
Hydromechanical 3-Way Directional Valve with Position Input
Build a 3-way directional valve using components from the Hydromechanical Valves library and compares it to the behavioral 3-Way Directional Valve (IL) block.
Hydromechanical 4-Way Directional Valve with Force Actuation
Build a 4-way directional valve using components from the Hydromechanical Valves library. The valve experiences mechanical effects such as mass and damping on the dynamic response of the valve spool.
Hydromechanical Poppet Check Valve
Build a check valve with a poppet design using components from the Hydromechanical Valves library and compares it to the behavioral Check Valve (IL) block.
Pressure Control Servo Valve
Model, parameterize, and test a pressure control servo valve with a closed loop control. This example also generates a comparison plot between the commanded and the achieved pressure in the actuator with respect to the time. This valve provides a precise and fast control of the pressure in the actuator with a very small electrical signal to the torque motor. These valves are used in the aerospace industry and the automotive industry for the safety critical applications.
Pressure Intensifier
Model, parameterize, and test a pressure intensifier.
Hydraulic Clutch System
Model, parameterize, and test a hydraulic clutch system. The model is used to generate the plot of the engine and the transmission system speeds during a declutching and clutch re-engaging scenario.
Pressure Control Solenoid
Model, parameterize, and test a pressure control solenoid valve. This example also generates a plot of the relationship between applied solenoid force and the resulting actuator port pressure.
Hydromechanical 3-Way Directional Valve with Position Input
Build a 3-way directional valve using components from the Hydromechanical Valves library and compares it to the behavioral 3-Way Directional Valve (IL) block.
Hydromechanical Poppet Check Valve
Build a check valve with a poppet design using components from the Hydromechanical Valves library and compares it to the behavioral Check Valve (IL) block.
Hydraulic Actuator with Dual Counterbalance Valves
An actuator controlled by a 4-way directional valve and loaded with an overriding load, requiring the use of counterbalance valves to prevent the load from creeping when the directional valve is in the neutral position. In the neutral position, the directional valve connects ports A and B to the reservoir while blocking the pressure port P. The counterbalance valves block flow from returning to the reservoir, thus holding the actuator in place.
Hydraulic Flow Rectifier Circuit
A flow rectifier circuit with four check valves and a flow control valve. It is used to allow a single flow control valve to control fluid flow in both directions. Similar to a Graetz circuit implemented with diodes, the check valves are arranged in such a way that flow always passes through the flow control valve in the same direction. In the Orifices subsystem, there are two more check valves that are used to select the orifice that the flow passes through depending on the flow direction.
Front-Loader Actuation System
A simple actuation system that has a lift and tilt cylinder. Each cylinder is controlled by an open center, 6-way, 3-position directional valve. The valves are connected in series through their unloading branch such that the system pump unloads when both spool displacements are in neutral position. If either tilt or lift command applies, the unloading path closes.
Drill-Ream Actuator
An actuator that drives a machine tool working unit performing a sequence of three technological operations: coarse drilling, fine drilling, and reaming. One of three pressure-compensated flow control valves controls the actuator speed as metering out return flow from the cylinder. Directional valves that are activated by a control unit perform the selection of an appropriate flow control.
Pressure Reducing Valve in Punching Operation
Models a hydraulic system with a direct operated, pressure reducing valve. This system helps to limit and maintain pressure in a hydraulic punching machine. Pressure reducing valves are common in hydraulic pressing, drilling, and stamping applications.
ABS Open Loop Test Bench
A simple way of modeling of the anti-lock braking system (ABS) and using it with the manual braking components. The model simulates for the open loop ABS and shows the response of the pressures achieved in the caliper disc brakes. This model can be utilized in sizing of the release valve, apply valve and accumulator for the hydraulic control unit of the ABS.
Anti-Lock Braking System (ABS)
A simple way of modeling an ABS braking system. The model shows the velocity profile responses achieved for the vehicle CG and the wheels.
