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5.6 Coupling Assembly
5.6.1 Couplings shall be visually examined without any rust and damage.Mating surface shall be smooth，bright and clean，and all parts shall be provided with mating marks.
5.6.2 Diaphragm coupling shall be assembled according to its original marks and shall comply with the following requirements：
a）Tensile or compression value shall conform to the product technical documents；
b）Tightening torque of connecting bolts shall conform to the product technical documents.