A. It's generally for general industrial pipeline and long-distance transportation pipeline for various corrosive and non-corrosive mediums. 

B. Standing ball valve has two types of valve body structure: 2-piece and 3-piece. Valve body may be connected by bolts or welding. 

C. BTL mainly manufactures 3 types of standing ball valve: forged steel standing ball valve, all-welded standing ball valve and cast steel standing ball valve. 

D. User may select full-size or reducing structure as required. The aperture of rate of full-size valve shall be same with inner diameter of pipeline for pipeline cleaning.