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January 11, 2016, 09:52 |
Valve Cracking Pressure
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#1 |
New Member
Join Date: Nov 2015
Posts: 10
Rep Power: 10 |
Hi everybody!
I'd like to evaluate the cracking pressure (which is the minimum upstream pressure to open the valve) of a swing check valve by means of an analytical method and a CFD analysis. The disc has to open of a small distance. Any suggestions? Thanks!! |
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January 11, 2016, 13:11 |
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#2 |
Member
Kaya Onur Dag
Join Date: Apr 2013
Posts: 94
Rep Power: 13 |
assuming spring has a constant torque T, and the length between the center of the valve and the spring position is x, so you need flow pressure to generate F = T*x much force on the valve. If the area on the valve is A then you need the static pressure of P > F/A from the flow to open the valve. I don't think you need a cfd computation to find P since the flow is going to be creeping flow at the pressure which is just enogh to open the valve.
I am not sure why you consider CFD for such problem |
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January 11, 2016, 17:11 |
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#3 |
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Join Date: Nov 2015
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First of all T=F*x. Then there is no spring, only the weight of the disc, let's assume it 2kg for example.
It is different, do I have to impose a small angle of rotation (1-2°), just the minimum to make flow pass? Do I have to impose a balance to rotation? |
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January 11, 2016, 17:27 |
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#4 |
Member
Kaya Onur Dag
Join Date: Apr 2013
Posts: 94
Rep Power: 13 |
you're right.
to me if there's no spring than any pressure greater than the ambient will make the disk / valve open considering that the center of gravity is aligned with the hinge. |
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January 12, 2016, 02:33 |
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#5 |
New Member
Join Date: Nov 2015
Posts: 10
Rep Power: 10 |
Unfortunately the solution is different.
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Tags |
cfd, chack, cracking, pressure, valve |
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