The domestic standards for electric stop valves are mainly GB/T, HG, and JB standards. At present, they mainly involve the following aspects:
1. Structural features: According to the structural classification of electric stop valves, there are mainly three types: metal-sealed electric stop valves, elastic-sealed electric stop valves, and hard-sealed electric stop valves.
2. Pressure level: GB/T 12236-2005 standard stipulates that the pressure levels of electric stop valves (JZ) include: PN0.25, PN0.6, PN1.0, PN1.6, PN2.5, PN4.0, PN6.4 and PN10MPa (Megapascal) levels.
3. Technical indicators: GB/T 12238-2008 standard stipulates the technical indicators of electric stop valves, such as connection size, external dimensions, sealing performance, durability, testing, marking and instructions for use.
It should be noted that many manufacturers in the domestic market produce electric stop valves that are sold using international standard names, but their quality and performance do not meet the requirements of international standards. Therefore, when purchasing electric stop valves, you must carefully identify them.