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Dbb Ball Valve Double Block and Bleed Ball Valve. Double Block and Bleed Design: Replaces multiple valves to reduce leakage and save installation space. Blow-out Proof Stem: Internally inserted stem prevents leakage and ensures up-sealing safety. Preloaded Spring Floating Seat: Ensures reliable sealing even in low-pressure conditions. Double Sealing O-Ring: Prevents leakage specifically at the stem area for enhanced safety. Customizable Flange Dimensions: Connecting flange dimensions can be designed according to customer requirements. Wide Material Selection: Available in Carbon Steel, Alloy Steel, Stainless Steel, and Duplex options. Multiple Pressure Ratings: Supports ANSI Class 150-900 and PN16-PN160 pressure standards.