What is the typical pressure drop of a check valve?
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I was wondering, what are the typical values for liquids and gases? Such as the liquid check valve at the pump outlet, and the gas check valve in the purging pipeline.
Pressure drop, what is that? Isn’t a check valve meant to prevent the backflow of material? Are there any other benefits?
What is the pressure difference before and after the check valve?
The check valves commonly used by us include lift-type, swing-type, and butterfly-type check valves. Essentially, a check valve is in a closed state at rest; therefore, it will close as long as the reverse pressure of the fluid is at least as high as the forward pressure. Moreover, a regular check valve can open as long as there is a slight amount of pressure in the forward direction; the so-called pressure difference is very small and can be ignored.
I heard from a friend that some can reach 80 kPa – is that really the case?
By 80kpa, you mean when it’s fully open, right?
This post was last edited by WZXUE2006 on 2016-6-7 17:29. Process Manual, Volume 2, 4th Edition, P63: Calculation of drag coefficient
The pressure of the fluid dropped by 80 kPa after passing through the check valve; I’m not sure whether it was fully open.
Okay, I’ll take a look at it tomorrow. Thank you.