Design standards for flange and seal ring of electric ball valve of the project The design of electric ball valve of the project meets the following relevant standards: design and manufacturing standard: HG/T2289-2001 Flange standard: GB9119-2000 Pressure test standard: GB/T1690-1992 Technical conditions of carbon steel: GB699-88 GB/T13927-92 Pressure test of general valve GB12221 Structure length of flanged metal valve Technical conditions of valve: HG4-329 Pull of rubber The tensile strength and elongation at break shall be in accordance with GB/T528. The tensile strength and elongation at break of rubber shall be in accordance with GB/T528.
The hardness of rubber shall be determined according to GB/T531. The brittleness temperature of rubber shall be in accordance with GB/T1682. The adhesion and strength between the valve and the fabric shall comply with the provisions of GB/T532. Hot air aging of rubber shall be carried out according to GB/T3512. The acid and alkali resistance of rubber shall be in accordance with GB/T1690. Relevant regulations and requirements of GB/T5749 Sanitary Standard for Drinking Water and GB/T17219 Standard for Safety Evaluation of Drinking Water Transmission and Distribution Equipment and Protective Materials.
2. Technical performance and material requirements 1) Working medium, temperature, structure and installation requirements Working medium is tap water or river water, working temperature is 0 ℃~80 ℃, working pressure is 1.0Mpa,