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          • Valve parts cleaning procedure and daily maintenance



            Valve parts must undergo the following procedures before assembly:

            1. According to the processing requirements, some parts need to be polished, and the surface should not have processing burrs, etc.;
            2, after pickling and purification, rinse with pure water, no residue, carbon steel parts omitted this step;
            3, after the degreasing is completed, the pickling passivation, cleaning agent does not contain phosphorus;
            4. Degreasing all parts and components;
            5. Use non-woven cloth or precision filter paper to dip analysis of pure alcohol to wipe each part until there is no dirty color;
            6. Each part shall be wiped dry with non-woven cloth, and the surface of the parts shall not be retained with wired wool, or blown dry with clean nitrogen.
            Daily maintenance of valve parts:
            1, check the valve stem and stem nut trapezoidal thread wear, packing is outdated failure, and carry out necessary replacement.
            2. The valve shall be inspected regularly, and the dirt on it shall be removed, and the anti-rust oil shall be daubed on the surface.
            3, the valve in operation should be in good condition, flange and bracket bolts are complete, threads are not damaged, no loosening phenomenon.
            4. Check whether the sealing surface of valve is worn, and repair or replace it according to the situation.
            5. The valve should be stored in a dry and ventilated room and blocked at both ends of the access.
            6, the scale on the valve should be kept complete, accurate, clear, valve seal, cover.
            7. After installation and application, the valve should be repaired regularly to ensure its normal operation.
            8. If the hand wheel is lost, it should be completed in time and cannot be replaced by a live wrench.
            9, packing gland is not allowed to skew or no pretightening gap.
            10, the valve in operation, avoid beating on it, or support heavy weight, etc.
            11. The sealing performance of the valve shall be tested to ensure its performance.
            12, the insulation jacket should be free of dents and cracks.
            13, if the valve is used in a poor environment, vulnerable to rain, snow, dust, sand and other contaminants, the valve stem should be installed with a protective cover.
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