1. Special attention: the pipeline must be cleaned and swept clean before installation. On one side, impurities block the valve port and dam... ...

1. Precautions for installation and use, and the installed control system, in order to ensure that the regulating valve can work normally du... ...

1. The use of butt welded flanges is required, but flat welded flanges are not recommended, because the steel pipe extending into the flat w... ...