Pressure losses due to check valve
Pressure losses due to check valve
(OP)
Hi,
I am calculating the pressure losses through a fluid system and would like to know if the cracking pressure of a check valve must be added when determining the losses through a check valve? Some manufacturer's have graphs showing the pressure losses at a given flow but does this include the cracking pressure?
Thank you,
Gabriel
I am calculating the pressure losses through a fluid system and would like to know if the cracking pressure of a check valve must be added when determining the losses through a check valve? Some manufacturer's have graphs showing the pressure losses at a given flow but does this include the cracking pressure?
Thank you,
Gabriel





RE: Pressure losses due to check valve
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pressure losses due to check valve
That answered my question and it is exactly how you said, the graphs start at the cracking pressure!!
RE: Pressure losses due to check valve
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pressure losses due to check valve
I agree with your thesis, even if there are around examples of pressure drop chart for check valves showing a pressure drop which could be lower than the cracking pressure of the valve. It seems to me somewhat strange. What do you think about?
RE: Pressure losses due to check valve
But, if there was such a chart , I'd say it would be for when it was installed in the vertical->down direction. If it was for a vertical->up direction, or a horizontal position, I DON'T think I would use such a valve.
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pressure losses due to check valve
Good luck,
Latexman
RE: Pressure losses due to check valve
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pressure losses due to check valve
Reference Fluid Transients in pipeline Systems Pof ARD Throley. Also look at the Delft laboratories or APCO website.
RE: Pressure losses due to check valve
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pressure losses due to check valve
RE: Pressure losses due to check valve
RE: Pressure losses due to check valve
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Pressure losses due to check valve
This makes sense.
The lines should be at least dashed in the dark blu area (ah ah I am clutching at straws)
RE: Pressure losses due to check valve
But less than 1/2 psi, I really wouldn't care. I have my analysis software set to solve to +/- 1 psi, and that's too close.
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pressure losses due to check valve
RE: Pressure losses due to check valve
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/