JoeBobJenkins
Marine/Ocean
This might be a stupid question but what causes blowdown pressure? Why would the pressure to open the valve be different than resetting the valve, or at least significantly different?
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What causes PRV blowdown?
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LittleInch
Petroleum
Basically momemtum of the flowing fluid / force of the fluid against the disc or sealing mechanism.
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JoeBobJenkins
Marine/Ocean
thanks, that was my first thought but then I thought how could that be significantly higher than the base pressure. I guess it is.
LittleInch
Petroleum
That's the art of the design. Once you start to flow you want the valve to open fully with a very small increase in pressure. There's a lot of effort goes into the design.
Blowdown percent is normally in the range 7 to 10%. So difference in force is not that big.
Blowdown percent is normally in the range 7 to 10%. So difference in force is not that big.
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