After the completion of the shut-off valve assembly, it is necessary to perform leak detection on the valve casing, the valve disc seal, the middle port joint surface and the packing one by one. The original valve inspection of our factory is shown in Figure 1. Press the valve to be inspected on the workbench, close the valve, fill the inlet with pressurized water or compressed air, and observe whether there is water or air bubble overflow at the valve outlet. Also check the valve outlet when inspecting the housing, the middle joint surface and the packing. If
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