Factory Helium Leak Tested：Every KF Butterfly Valve (available in KF16/KF25/KF40/KF50) undergoes helium leak detection before shipment, ensuring zero leakage and reliable quality for U.S. ultra-high vacuum systems. CNC Precision Machining：The KF Butterfly Valve is crafted via CNC equipment for integrated molding—high precision, clean burr-free edges, and enhanced vacuum leak resistance, meeting U.S. industrial standards Durable 304 Stainless Steel：Made of 304 stainless steel, the KF Butterfly Valve boasts strong toughness, high hardness, corrosion resistance, and excellent oxidation resistance, suitable for harsh U.S. industrial environments. Tight Vacuum Sealing：With a precision design, the KF Butterfly Valve delivers superior sealing performance, connecting tightly to pipelines and maintaining high vacuum levels for U.S. industrial applications. Smooth Polished Finish：The KF Butterfly Valve features inner/outer polishing, neat smooth cuts, and no burrs—reducing friction for smoother rotation, and lowering maintenance needs for U.S. operators. Product Description For users building ultra-high vacuum systems in U.S. industries such as semiconductors, electronics manufacturing, or research laboratories, the KF Butterfly Valve is a core component ensuring system sealing and stability. We offer four mainstream models—KF16, KF25, KF40, and KF50—that precisely match vacuum pipelines of different specifications, eliminating the need for additional adapter parts. Crafted entirely from 304 stainless steel, this KF Butterfly Valve combines high toughness and hardness, resisting corrosion and oxidation in industrial environments for long-lasting durability. It undergoes integrated machining via CNC equipment throughout the production process, resulting in burr-free edges and high dimensional accuracy, which minimizes the risk of vacuum leakage from the source. Most critically, every valve undergoes strict helium leak detection before leaving the factory to ensure zero leakage. Paired with its precision sealing structure, it connects tightly to pipelines and maintains stable high vacuum levels, fully meeting the rigorous requirements of U.S. industries for vacuum systems. Additionally, the valve’s inner and outer walls are polished, reducing friction during operation for smooth handling and simplifying daily cleaning and maintenance—saving more labor costs for the operation of your vacuum system.