Kd gas vs liquid
Kd gas vs liquid
(OP)
For flow and restriction orifices and nozzles, the Kd values are the same for liquids and gases.
Question: Why is there then such a big difference in Kd values for relief valves between gases (0.975) and liquids (0.62) ?
Question: Why is there then such a big difference in Kd values for relief valves between gases (0.975) and liquids (0.62) ?





RE: Kd gas vs liquid
JAC
RE: Kd gas vs liquid
RE: Kd gas vs liquid
"We don't believe things because they are true, things are true because we believe them."
RE: Kd gas vs liquid
Body bowl flow dynamics for sonic vapor valves have no effect on mass flow through the nozzle unless the downstream pressure exceeds the critical flow pressure and flow goes subsonic. At that point, body effects start to come into play and you'll notice that the coefficients for sub-sonic vapor valves start dropping to the liquid valve coefficient levels.
JAC
RE: Kd gas vs liquid