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Some features of half ball valve

           After long-term use, the seat of half ball valve will also produce small quantities of wear and tear, which can continue to use by adjusting the stem and the packing in the process of opening and closing valve stem for just rotate 90 °, then compressing the packing gland bolt a little can achieve the packing without leakage, while the other valve is still a small leak reluctant to use the large leakage change valve.

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