Valves and Orifices

Variable-area components for fluid flow control

Use these blocks to model orifices, valves, and valve actuators in the two-phase fluid domain.

Simscape Blocks

Directional Control Valves

4-Way 2-Position Directional Valve (2P)	4-Way 2-Position Directional Valve in the two-phase fluid domain (Since R2024b)
4-Way 3-Position Directional Valve (2P)	4-way, 3-position directional valve in the two-phase fluid domain (Since R2024b)
Check Valve (2P)	Check valve in a two-phase fluid network (Since R2021a)

Flow Control Valves

Thermostatic Expansion Valve (2P)

Flow control valve that maintains evaporator superheat (Since R2020b)

Pressure Control Valves

Pressure Relief Valve (2P)	Pressure relief valve in a two-phase fluid network (Since R2021a)
Pressure-Reducing Valve (2P)	Pressure-reducing valve in a two-phase fluid network (Since R2021a)

Valve Actuators and Forces

Multiposition Valve Actuator	Multiposition actuator in any fluid domain (Since R2020a)
Proportional Valve Actuator	Power-controlled valve actuator in any fluid domain (Since R2020a)

Orifices

Orifice (2P)

Constant- or variable-area orifice in a two-phase fluid network (Since R2021a)

Topics

Building a Custom Valve
Model a custom valve with orifice blocks.

Featured Examples

Residential Air Source Heat Pump

Models an air source heat pump system that is used to heat a residential building having hot-water radiators for heat distribution. The two-phase fluid refrigerant takes up heat from the environment moist air mixture and transfers heat to water. The compressor drives the R410a refrigerant through a condenser, a thermostatic expansion valve, and an evaporator. An accumulator ensures that only vapor returns to the compressor.

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Residential Ground Source Heat Pump

Models a ground source heat pump system that is used to heat a residential building having hot-water radiators for heat distribution. The ground source heat pump uses R410a, a two-phase fluid refrigerant, as the working fluid. The heat pump takes up the naturally existing heat stored in the ground and transfers the heat to the hot-water radiators. The compressor drives the refrigerant through a condenser, a thermostatic expansion valve, and an evaporator. An accumulator ensures that only vapor returns to the compressor. A receiver ensures that only liquid returns to the thermostatic expansion valve.

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