Krav på ventilförsörjning
General requirements of valves
- (1) Ventiler must be manufactured in accordance with their corresponding technical standards, design drawings, technical documents, and order contracts. Only after passing the inspection can the goods be supplied from the factory.
- (2) Special requirements should be specified in the order contract and inspected and supplied according to the specified requirements.
- (3) The manufacturer shall provide the products the user requires within the period specified in the contract.
Coating and protection of valves
- (1) Except for austenitic stainless steel and copper valves, the nonmachined outer surfaces of other metal valves shall be painted or coated as specified in the contract.
- (2) Machined surfaces that are not painted or have no rust prevention layer must be coated or sprayed with a rust prevention layer that is easy to remove. The valve chamber and parts should not be painted and be free of dirt and rust.
- (3) After inspection and testing, debris and water inside the valve should be cleaned and blown dry for transportation. Valves should be protected from mechanical damage and atmospheric corrosion during transportation, and ensure they can be stored on-site for at least 18 months before installation.
- (4) The manufacturer’s standard paint applies to nonmachined surfaces. Bronze, stainless steel, and high alloy valves should not be painted
- (5) Austenitic stainless steel valves should be protected to avoid chlorine corrosion during transportation, cleaning, manufacturing, testing, and storage due to exposure to salt spray or atmospheric conditions. If transported by truck in areas where chloride salts are used, protection should also be provided. Damp-proof materials should be considered for sealing or wrapping.
- (6) For carbon steel and ferritic alloy steel flanges and butt welded valves, the sealing surface and groove of the end flange should be coated with a rust-resistant coating that can be removed or solvent removed before installing protection at the end.
- (7) The end faces of flange end and butt welded end valves should be protected by metal plates, hard fiberboards, thick plastic plates, or wooden boards and tightly attached to the valve body. Valves with threaded or socket ends and drain ports should be protected with metal, wooden blocks, or plastic plugs.
- (8) Threads and socket welding openings should be sealed with plastic or metal protective components to prevent dust or other foreign objects from entering the interior of the valve.
Sign of valves
- (1) Unless otherwise specified, American standard valves shall have permanent identification in accordance with API 600, API 6D, or MSS SP-25, and national standard valves shall have permanent identification in accordance with GB/T 12220. The identification shall include the melting furnace number or the melting mark of the manufacturer.
- (2) Only when it is not feasible to apply the required markings to the body can the markings be applied to the nameplate. However, the arrow indicating the flow direction of the valve must be marked on the valve body.
- (3) The label should be firmly fixed on the obvious part of the valve, and its content must be complete and correct. It should comply with the provisions of GB/T 13306, and its material should be made of stainless steel, copper alloy, or aluminum alloy.
- (4) The paint used for color coding and marking shall not contain any harmful metals or metal salts, such as tin, zinc, lead, sulfur, copper, or chloride, which can cause corrosion in the hot state. The paint shall resist corrosion in salt water, tropical environments, or similar situations.
- (5) For small items that are difficult to mark, stainless steel wire should be used to tie stainless steel tags for marking.
Packing of valves
- (1) After passing the test, the surface of the valve should be cleaned of oil and dirt, and the remaining test medium should be removed from the inner chamber.
- (2) Blind flanges should be used at both ends of the valve to protect the flange sealing surface, welding or threaded end, and the valve’s inner cavity. Blind plates should be made of wood, wooden fiberboard, plastic, or metal, and fixed with bolts, steel clips, or locking devices,
- (3) Valves should be equipped with corrosion inhibitors or other high-quality fillers that meet the design drawings and usage requirements. The exposed threaded parts (such as valve stems and connecting pipes) should be protected.
- (4) Before shipping the equipment, the manufacturer should properly package each according to GB/T 13384 to avoid damage during transportation. The equipment should be fixed at the bottom of the packaging box to avoid shaking during transportation.
- (5) Each cargo container, Flat noodles case, and packing case must be painted with clear and readable transportation protection marks on the top or side or in other ways, such as waterproof, sunscreen, no upside down, and other marks. The lifting center of gravity must be marked and strictly observed during loading and unloading.
- (6) If special tools exist, they should be packaged separately and shipped with the list of special tools. The equipment number and the words “special tools” should be marked outside the packaging box.
- (7) If the manufacturer provides spare parts, they should be packaged separately for long-term storage, and there should be necessary markings on the spare parts for future identification.
- (8) If necessary, additional protection should be provided for equipment and components susceptible to water and moisture damage. Components with nondrainable gaps or gaps should be covered to prevent water and debris from entering during transportation.
Transport of valves
- (1) The opening and closing parts of factory ball valves and plug valves should be in the open position, the opening and closing parts of other valves should be in the closed position, and the opening and closing parts of check valves should be in the closed position and fixed.
- (2) Valves should be packaged and shipped. All valves with a nominal size less than DN40 should be packed and shipped. Valves with a nominal size of at least DN50 can be packaged in bulk or in other ways except as specified in the contract. However, it must be ensured that there is no damage or loss of parts during normal transportation.
- (3) The land transportation packaging box should be placed in a weatherproof box car, and the manufacturer should cover it with rainproof canvas. If transported by sea, measures should be taken to prevent the internal and external surfaces of the equipment from being corroded by salt mist in the marine environment.
- (4) The transportation packaging should be complete and tidy. The interior cargo should be evenly distributed and placed neatly, with suitable padding and fixed interior cargo, and the center of gravity should be positioned as low as possible.
- (5) The wooden boxes used for loading and unloading must be securely secured to prevent damage to the integrity of the boxes due to vibrations during transportation.
- (6) Attention should be paid to safety during loading and unloading, and lifting equipment should not be used to lift heavy objects exceeding its rated load.
- (7) If a lifting and handling position is marked on the outside of the packaging box, it must be strictly followed to prevent accidental damage to the valve.
- (8) Export valves should be shipped in containers as much as possible.
- (9) The valve leaves the factory with a product certificate, product description, and packing list.