bryansonnier
Mechanical
I'm looking for literature on the design of needle and seat valves or ball and seat valves, but short of that I'll take a general rule of thumb for flow through an orifice with a centerline obstruction (i.e. like a needle valve). Is there a way to approximate the loss given the open area and shape. There are tables a plenty for orifices of every shape and size under the sun, but I'm having trouble locating one for an orifice with something in the middle.