I'm engaged in engineering. Shanghai's is better, but it's expensive, which can be seen from the scale of the company, the time of its establishment, and the comprehensiveness of its website and products. But the valve depends on where you use it, and whether you are the owner or the contractor. It's a long story. If you are the owner, of course, you can use it well, which will save you some trouble in future maintenance. As for the contractor, it is almost impossible. Anyway, it will be guaranteed for 2 or 3 years, and the pressure is high. Just try to use it well, and the pressure is low. Any valve is similar, and it is best to use it well.