How to represent Globe Valves and Butterfly Valves?

I am working on a Simulink model of a turbine (I have never learned SImulink before, and I have only about 2 weeks and a half of practice), where the fluid (air) comes through a pipe system and different types of valves. I am a bit confused regarding two valves: the globe and the buttefly valves. Which blocks in Simulink can help me represent these two components? I have thought about using the 2-way Directional Vavle block as my globe valve, and the closest thing I found was the Gate Valve block as my butterfly valve. However, I am unsure about this. Could someone give me some suggestions?

I thank you very much for all your help!

Kind regards,

Isaac L.

[DB]

Have you ever gotten an answer on this? Would like to hear!

[Isaac Asiel Lorenzo Mercado]

Hello DB,

So it seems someone replied to my answer an hour ago, which I find funny because I made this question almost 5 years ago haha

The answer the person gave me is the same thing I did for my project during 2018: using the 2-Way Direction Valve is a very good way to represent the Glove Valve because it allows you to control the flow direction and also simulate the opening and closing behavior. For the Butterfly Valve, the Variable Orifice or the Variable-Area Orifice blocks are useful in order to model it. If you need any more help or have more questions regarding this, let me know.

I hope these answers help you and that you can have success in the models you are making!

Kind regards,

Isaac L.

[DB]

Hi Isaac, thanks for responding so many years later! Do you have an example of using the variable orifice for butterfly valve simulation with PID control? I cannot find a good example on how to model it.

[DB]

@Isaac Asiel Lorenzo Mercado, could you please give some insight into your approach?

Answer 1

[Shaik]

Hi,

In Simulink, there are several blocks you can use to represent valves in your turbine model, including the globe valve and butterfly valve. Here are some suggestions:

1. Globe Valve: The 2-way Directional Valve block can indeed be a suitable choice for representing a globe valve. This block allows you to control the flow direction based on an input signal. By appropriately setting the input signal, you can simulate the opening and closing behavior of a globe valve.
2. Butterfly Valve: While there is no specific "Butterfly Valve" block in Simulink, you can use other blocks to represent its functionality. One option is to use a variable orifice block, such as the Variable Orifice block or Variable Area Orifice block. These blocks allow you to control the size of the orifice opening, simulating the behavior of a butterfly valve.

[DB]

Hi @Shaik,

I have the Kv values of a butterfly valve I want to model with PI control. Furthermore, I know the area of the valve. However, I still don't understand how I can use these values for a variable orifice. Firstly, I have to select one the following option for Orifice (IL):

• Linear - Area vs. control member position
• Tabulated data - Area vs. control member position
• Tabulated data - Volumetric flow rate vs. control member position and pressure drop

I only have some indication of the ratio % valve open vs. % Kv. The third option is the only one that involves the flow rate, but I don't know about the pressure drop. What is the best option? I have tried all of them, but my valve just swings between 0% and 100% opening with all of them, and simulation time is about a minute per second simulation.

[DB]

@Shaik Could you please respond? I just cannot figure it out the modeling of a butterfly valve. Especially the 'control member position' is vague to me. Why is this property in meters and not, for example, percentage of actuator?

[Aiden]

@DB Did you manage to figure out your issues with the variable orifice?

I also require a butterfly valve in my model.

Aiden