Hi folks, Firstly a little background, I work for a company that manufactures gas pressure regulators. Last year I was a machinist studying for my HNC in manufacturing engineering. Since passing work has given me the opportunity to work in the product engineering office as a product tester and work load within the office has increased lately due to expansion, I have been tasked with analysing a certain feature of the new product range. I need to model the effects of the below orifice (in red), but I have no idea what I'm doing!!! Are there any basic math techniques I can use to get a better understanding of what is happening at this feature? Thank you for your time.