Selection of valve sealing level
1 Selection of Domestic Water Meter Valve Sealing Level
(1) The national standard GB/T13927 implemented on July 1, 2009 ((Industrial Valve Pressure Test) is based on the European Standard ISO 5208. It is applicable to industrial metal valves, including gate valves, globe valves, and static water meters. Check and pressure tests of check valves, plug valves, ball valves, butterfly valves, etc. The grading and maximum allowable leakage of the sealing test are the same as those specified in ISO 5208. This standard is an amendment to GB/T 13927 (General Valve Pressure Test), and GB/T Compared with T13927, AA, CC, E, EE, F, and G levels have been added.
Water meter valve seal rating standard
The new version of the standard stipulates that “the choice of leakage level should be one of the requirements stipulated in the relevant valve product standards or in the ordering contract. If there is no special provision in the product standard or ordering contract, the non-metallic elastic sealing valve shall comply with Class A requirements and metal sealing Valves are required to meet Class D requirements.” Normally, Class D applies to general valves, and more critical valves should use Class D or higher leakage.
(2) The mechanical industry standard JB/T 9092 "Valve Inspection and Testing" is a revision of ZB J16006. The maximum allowable leakage of the seal test is based on the American Petroleum Institute Standard API
598--1996. Applicable to petroleum industry valves, including metal seals, elastic seals and non-metal seals (such as ceramics) gate valves, globe valves, plug valves, ball valves, check valves, and butterfly valve inspections and pressure tests. The current GB/T 9092 is being revised.
(3) Engineering design should pay attention to: National Standard GB/T19672 (Technical Conditions for Pipeline Valves) is based on European Standard ISO 14313 and American Petroleum Institute Standard API 6D. National Standard GB/T 20173 Oil and Gas Industry Pipeline Transportation System “Pipeline Valves” was developed in accordance with the European Standard ISO 14313. Both GB/T 19672 and GB/T 20173 standards have the same acceptance criteria for valve leakage as ISO 5208 Class A and Class D. Therefore, there are high levels of engineering design. In the case of its standard leakage requirements, it should be given in the order contract.