I have come across frequent flapper (disc) failures on swing type check valves. The service in the flow line is oil+water mixture and the pressure is generally in the range of 30-40 psig. I assume the failure is due to pressure variations in the line and the continuous disc movement due to it. This is happening on multiple flow lines and recurring as well. Can someone kindly advise the solution to overcome this? Change the check valve type maybe?
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