Structural forms of A42 and A44 safety valves
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According to JB/T308-2004, for valve structure type A42, it can be a spring-loaded, spring-sealed full-opening type or a single-lever safety valve; while for type A44, it can be a spring-loaded, spring-sealed full-opening type with a wrench or a double-lever safety valve. Is it necessary to specify the exact type when indicating the valve material? Are there any other criteria that allow for more detailed classification?
The model of the safety valve contains this information
Yeah, every time I use A42 or A44, I still need to specify the exact format – it’s troublesome
Anyway, I haven’t written it yet; if you’re worried, it’s better to write it in more detail
The material depends on the operating conditions. . . . . .
The material depends on the operating conditions. . . . . .
A42 refers to spring-actuated full-open or lever-type full-open valves; according to JB/T 308, safety valves are considered automatic valves, so their second category is omitted. The number 4 here indicates the type of connection, specifically flange connection； The second A44 refers to the flange connection for the fourth unit; the 4 here denotes a model with a spring that is not enclosed and comes with a handle, or a double-lever full-opening type. When filling in the details, it should be specified as, for example, a spring-loaded safety valve A42H-25C