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DBB (Double Block and Bleed): Two single piston-effect seats.
DIB-I (Double Isolation and Bleed Type I): Two double piston-effect seats.
DIB-II (Double Isolation and Bleed Type II): One double piston-effect seat and one single piston-effect seat.
Source: https://www.valvemanufacturer.net/dbb-trunnion-mounted-ball-valve-2-12-inch-class-150-900-lb.html