Keywords
Valve box cover bolt
Fracture analysis
Finite element analysis
Alternating load
Submitted : 2026-03-23
Accepted : 2026-04-07
Published : 2026-04-22
Abstract
Aiming to address the repeated fracture of connecting bolts in the feed valve box cover of a large Type A diaphragm pump, a three-dimensional model of the valve box assembly was first established. Subsequently, bolt strength was evaluated using three finite element analysis methods: axisymmetric analysis, cyclic symmetry analysis, and full 3D integral analysis. It was clarified that the first few threads bear the maximum stress, which is consistent with the actual fracture position. Combined with the analysis results, it is concluded that the main causes of bolt fracture are alternating load bearing, low safety margin of specifications, and the coarse thread design also affects its load-bearing capacity.
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