3/2 pneumatic valve model

I am trying to design a 3/2 pneumatic valve (3 ports and 2 positions). The valve has a supply port, common port, and an exhaust port. There isn't a "switch" that I can use in the model, so I have a convoluted series of variable restriction elements in the system. This works on its own, but returns errors when added to the whole system.

The flow from supply->common and common->exhaust have their own variable restrictions (restriction varies with differential pressure) and I have another variable restriction in series with each one of these acting as a "switch" to turn flow on and off between the ports. This results in a node with no volume element (which I have been reading is a bad thing).

Any help or advice on how to model this would be greatly appreciated.

Answer 1

[Abhi Sundararaman]

It sounds like you're building this component using a series of other components (like the variable restriction component, and other pipes). I think it would be easier to just code your own custom component using the Simscape Language.

The following link has some info on creating custom components, with some examples:

https://www.mathworks.com/help/physmod/simscape/lang/creating-custom-components.html

Additionally, you can look at the source code for some of the existing simscape blocks, like the various pipes, and create your own 3/2 valve.

[Ryan Takatsuka]

I was able to modify a series of standard Simscape components to successfully create a working 3/2 valve; however, the simulation runs very slowly. Is it much more efficient to create a custom component using the Simscape language? I have been avoiding this due to the complexity of the Simscape gas components (all of the choked flow, laminar/tubulent stuff, and enthalpy/energy conservation makes these much more complex than just modifying a standard electrical or mechanical component).

[Dhruv Shukla]

Hello Ryan,

I am making a project on pneumatic vacuum lifting system. For that, I have to create some custom block such as vacuum pump, vacuum filter and suction cup. So, can you please tell me that how can i create a custom block of pneumatic.