Not quite an engine this time, just a vital part for some.
I am sorry I don't remember where I got the drawings for this one but if someone tells me I will put it on here to give credit where credit is due.
Here I present for your viewing pleasure and information, A Globe Valve.
There is also a small enough 3D PDF so you can get a good view.
Hope someone likes it and is useful to them.
Cheers.