Is the forward rotation of the butterfly valve of the electric flue in Lanzhou closed? (4) With automatic cleaning function and self-cleaning function, it can easily cut off various impurities in the pipeline to ensure the smoothness of the pipeline.
、 (5) Fluid speed If the ball valve must be opened and closed for many times under the condition of high speed fluid, it should be considered whether there is any deformation of the sealing gasket, especially for the ball valve used on the high-temperature line, it should be checked.
