The long-term unused ball valve is supposed to be coated with rust-preventive oil, and regularly inspected and cleaned. It should be stored in a dry and well-ventilated area, and both ends of its channel must be blocked. After installation, it is necessary to periodically check the seal, stem, nuts’ trapezoidal thread and filler, in order to replace damaged one instantly. Sealing performance testing ought to be carried out, so as to guarantee safe operation and longer service life.

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