APPENDIX H – Check Valves
Surge Analysis and the Wave Plan Method
Supplementary Material: Example Problems and Solutions
Appendix H – Problem 5
H.5 Consider a 500 mm straight-seat swing check valve installed downstream of a pump discharge. The cast iron disc of the check valve has an equivalent thickness of 10mm and an effective diameter of 520 mm. The disc is attached to the hinge (see Figure H.7) in such way that the center of gravity of the disc is skewed by 10 mm from the vertical axis passing through the hinge. The flow in the pipeline is zero keeping the disc in the closed position with an upstream pressure of 0.1 bar and a downstream pressure of 10 bar. Draw a free body diagram showing all the forces acting on the disc assembly and the moments at the hinge. When the pump is started, at what upstream pressure does the check valve cracks open?
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