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1. Product design, manufacturing process and processing measures:
1.1 The chemical composition and mechanical properties of the main component materials of the valve comply with the provisions of the material standards. The surface quality of casting valves shall comply with the provisions of MSS SP-55, and the repair welding of materials shall comply with the provisions of ASME B31.3.
1.2 The materials of the valve body are provided by designated qualified sub suppliers, and strict personnel are responsible for controlling the quality of the valve body materials. Certificates of conformity and material inspection reports are provided for the raw materials when leaving the factory.
1.3 The outer surface and inner cavity of the valve are all shot blasted and polished, and the inner cavity is cleaned with high-pressure anti rust liquid. After being heated at high temperature, the oil stains are removed and anti rust agent is sprayed.
2. The manufacturing accuracy of our products is guaranteed by the process and tooling, and the design and manufacturing are strictly carried out according to relevant design process standards. Each production process is subject to inspection and control, and each component is inspected. After product assembly, performance and pressure tests are conducted on each valve to ensure compliance with product design drawings and production and manufacturing standards.
3. The production process of our factory's products adopts advanced processing ethods, and we have various complete mechanical processing and testing equipment that can meet the requirements of product design and process, as well as the needs of product design drawings.
3. After the entire valve is assembled, the pressure test and overall debugging of the valve shall be carried out according to national inspection standards to ensure flexible operation and no jamming phenomenon. The sealing parts should be in good contact to ensure flexible operation and good sealing under hot working conditions of the valve.
After the valve debugging is completed, the entire package is transported to the site by car.
5. Matters not covered shall be executed in accordance with relevant regulations and standards.
Factory inspection
1. All valve products and their main components shall undergo testing and inspection before leaving the factory, and can only be shipped after passing the inspection. For various valves with a diameter greater than or equal to DN200mm, the buyer's representative has the right to witness the test at the seller's factory before the product leaves the factory.
2. The pressure bearing parts of the valve and its accessories need to undergo hydraulic strength tests in the factory, with a test pressure of 1.5 times the nominal pressure and a pressure holding time of 10 minutes. It is considered qualified if there is no leakage or structural damage.
3. After the final assembly of the valve, a sealing water pressure test should be conducted. The test pressure should be 1.1 times the nominal pressure, and the pressure should be maintained for 10 minutes. It is considered qualified if there is no leakage.
4. Conduct a 0.6MPa gas seal test according to API 598.
After the final assembly of the valve, an opening and closing test should be conducted to ensure the flexibility of the action and the correctness of the fully open and fully closed positions.
6. Matters not covered shall be executed in accordance with relevant regulations and standards.
Painting, packaging, marking, transportation
1. All casting parts shall be sandblasted and protected with primer and topcoat according to national standards. The primer shall be applied within 8 hours after sandblasting before rusting, and the primer shall be applied in accordance with national standards.
2. Valves shall be marked according to the requirements of MSS SP-25 standard, with a label on each valve indicating specifications, model, design limits, manufacturer name, and other contents.
3. Our factory produces products that provide the chemical composition and mechanical properties of the main component materials when leaving the factory, as well as product inspection reports and product qualification certificates.
4. After the valve passes the factory acceptance, the entire machine is packaged and shipped out of the factory, and all parts are cleaned and free of debris. After arrival, the valve is stored indoors and can be installed directly without disassembly and maintenance.
5. Valve equipment shall be packaged according to national standards to prevent damage during transportation and storage, and to prevent contact with water and moisture.
6. Matters not covered shall be executed in accordance with relevant regulations and standards.
after-sale service
1. Our factory ensures that the products designed and manufactured by our factory meet the requirements of users, and that all projects and services comply with the requirements of this technical agreement.
2. The entire valve is packaged and shipped from the factory, and can be installed and used without disassembly, cleaning, or hydrostatic testing after delivery.
3. The factory guarantees the quality and performance of the products. Within the 12 month warranty period of the products, our factory provides free three guarantee maintenance for the demander. If required by the purchaser, our factory will arrive at the site within 48 hours for service and installation guidance.
4. Users complain about quality issues and respond immediately. After sales service personnel arrive at the site within 24-48 hours. After sales service requires users to fill out the quality of the service, feedback information form, and provide appraisal opinions in order to improve our service work.
5. Matters not covered shall be executed in accordance with relevant regulations and standards.
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