Thread Content
General requirements: (1) Valves must be manufactured in accordance with the corresponding technical standards, design drawings, technical documents, and provisions of the purchase contract. Only after passing the inspection can it be shipped for sale. (2) When there are special requirements, they shall be specified in the order contract, and inspection and delivery shall be carried out in accordance with those requirements. (3) The manufacturer shall supply all the products required by the user within the period specified in the contract. Coating and protection: (1) Except for austenitic stainless steel and copper valves, the unprocessed external surfaces of other metal valves shall be painted or coated in accordance with the provisions of the contract. (2) Processed surfaces that are not painted or lack an anti-rust coating must be coated or sprayed with an easily removable anti-rust layer. The interior of the valve and its components must not be painted, and there should be no dirt or rust spots. (3) After the inspection and testing are completed, any debris and water inside the valve should be removed and dried before it is transported. The valves must be protected from mechanical damage and atmospheric corrosion during transportation, and it must be ensured that they can be stored on-site for at least 18 months prior to installation. (4) The manufacturer’s standard paint is suitable for unmachined surfaces. Bronze, stainless steel, and high-alloy valves should not be painted. (5) Austenitic stainless steel valves need to be protected to prevent chlorine corrosion resulting from exposure to salt spray or the atmosphere during transportation, cleaning, manufacturing, testing, and storage. If truck transportation is used in areas where chlorides are present, protection should also be provided. It should be considered to use moisture-proof materials for sealing or wrapping. (6) For carbon steel and ferritic alloy steel flanges and butt-welded valves, before installing protection at the ends, the end flange sealing surfaces and grooves shall be coated with a removable or solvent-cleanable anti-rust coating. (7) The end faces of flanged and butt-welded valves shall be protected with metal plates, rigid fiber boards, thick plastic sheets, or wooden boards, which shall be firmly attached to the valve body. For valves with threaded or socketed ends as well as drain ports, these ends should be protected with metal, wooden, or plastic plugs. (8) Threads and socket weld openings should be covered with plastic or metal guards to prevent dust or other foreign objects from entering the valve. Marking: (1) Unless otherwise specified, American-standard valves are equipped with permanent markings in accordance with API 600, API 6D, or MSS SP-25, while Chinese-standard valves have such markings in compliance with GB/T 12220 standards; these markings shall include the furnace number or the manufacturer’s marking. (2) The mark may be applied to the nameplate only when it is not feasible to apply the required mark on the body itself. However, the arrow indicating the flow direction of the valve must be marked on the valve body. (3) The label shall be firmly fixed in a prominent position on the valve, and its contents must be complete and correct. It shall also comply with the provisions of GB/T 13306; its materials shall be made of stainless steel, copper alloy, or aluminum alloy. (4) Coatings used for color coding and marking must not contain any harmful metals or metal salts, such as tin, zinc, lead, sulfur, copper, or chlorides and other substances that can cause corrosion when heated; moreover, the coatings should be resistant to corrosion caused by saltwater, tropical environments, or similar conditions. (5) For small objects that are difficult to label, a method of attaching stainless steel tags using stainless steel wire should be employed for labeling. Packaging (1) After the valve passes the tests, any oil or dirt on its surface should be removed, and any remaining test medium from its interior cavity should be eliminated. (2) Blind plates should be used at both ends of the valve to protect the flange sealing surfaces, welding ends or threaded ends, as well as the interior cavity of the valve. Blind plates are made of wood, wood fiber boards, plastic, or metal, and are secured using bolts, steel clamps, or locking devices. (3) Valves should be equipped with packing containing corrosion inhibitors or other high-quality packing that meets the design specifications and operational requirements; exposed threads (such as those on the valve stem and connections) must be protected. (4) Before shipping the equipment, the manufacturer shall properly package each unit in accordance with GB/T13384 to prevent damage during transportation. The equipment should be secured at the bottom of the packaging box to prevent it from moving around inside the box during transportation. (5) Each cargo container, crate, or packaging must have clearly legible protective markings applied to it on the top, sides, or in some other way, such as markings indicating water resistance, sun protection, and the prohibition of inversion. The center of gravity for lifting must also be indicated, and these requirements must be strictly followed during loading and unloading. (6) If there are special tools, they should be packaged separately and shipped along with a list of those tools; the equipment number to which they belong as well as the word “Special Tools” should be indicated on the outside of the packaging box. (7) If the manufacturer provides spare parts, they should be packaged separately to facilitate long-term storage; moreover, the spare parts must carry necessary markings for easy identification in the future. (8) If necessary, additional protection should be provided for equipment and components that are susceptible to damage from water and moisture; components with gaps or openings through which water cannot drain should be covered to prevent water and debris from entering during transportation. Transportation (1) The operating elements of ball valves and plug valves leaving the factory should be in the open position, while those of other valves should be in the closed position. The operating element of check valves should be in the closed position and secured. (2) The valves shall be packaged and shipped. All types of valves with a nominal size of less than DN40 shall be shipped in boxes. For all types of valves with a nominal size of DN50 or larger, in addition to what is specified in the contract, they may be shipped in bulk or packaged in other ways, provided that the parts are not damaged or lost during normal transportation. (3) Land transport packaging boxes should be placed in weatherproof sheds, and the manufacturer should cover them with rainproof canvas. If transported by sea, measures should be taken to prevent the inner and outer surfaces of the equipment from being corroded by the salt mist in the marine environment. (4) The transport packaging should be intact and neat. The goods inside should be loaded evenly, arranged neatly, properly padded, secured, with the center of gravity as low and centered as possible. (5) The wooden crates used for loading onto vehicles and ships must be secured to prevent any damage to their integrity due to vibrations during transportation. (6) Safety must be observed during loading and unloading; lifting equipment shall not be used to lift loads exceeding its rated capacity. (7) If there are markings on the outside of the packaging box indicating the lifting and handling positions, these must be strictly followed to prevent accidents that could damage the valve. (8) Export valves should be shipped in containers whenever possible. (9) The valve is shipped with a product certificate, product instructions, and packing list.