In China, most fan manufacturers use the models specified in GB for labeling, but few pump manufacturers do so !
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In China, most fan manufacturers use the models specified in GB for labeling (such as 4-72), whereas pump manufacturers rarely use such standard models for labeling ! Why? Pumps are highly technical, with many manufacturers, which leads to them operating in isolation? The technical complexity of fans is low; do they all just follow orders from above? Or is this an industry* convention? !
That’s true too; for some pumps, different manufacturers use different names for them
Because no performance parameters are specified, and no dimensions are defined. That’s why this situation has arisen
It’s probably because there are too many types of materials pumped, making it impossible to establish rules.
Pump applications are complex and require a high level of technical expertise; therefore, competition has not yet reduced to a purely cost-based level, and each company can still operate independently； Generally speaking, the operating conditions of fans remain relatively fixed. If the fan models are all from the post-war era, it is easy for there to be inconsistencies in these models, which can result in them being approved during the selection process; therefore, it is not advisable to have a variety of fan models
The style has a low level of technical complexity, and the requirements regarding air volume are not very strict. The requirements for the medium used in pumps are very strict, and different industries have different specifications.