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Double Block and Bleed Flanged Ending Ball Valve (Q41F). Double Block and Bleed Design: Features twin ball design with needle bleed and drain valves for enhanced safety. Wide Material Selection: Available in A105, LF2, F22, F304, F316, and their low-temperature variants. Fire Safe & Anti-static: Designed with fire-safe features, anti-static function, and blow-out proof stem. Flexible Customization: Offers full, minor, and sample-based customization with OEM/ODM services. 100% Quality Inspection: Every finished product undergoes visual and functional inspection before shipment.