Tianjin Yongsheng Valve Fiting Co.,Ltd. (Tianjin Yongsheng) was established in November 2004. It is located in the Guangming Industrial ZBeizhaikou, Jinnan District, Tianin, covering an area of 15 acres with a building area of 9,000 square meters. The companyis a subsidiaryCangzhou Yongsheng Stainless Steel Casting Co, Ltd. (refered to as Cangzhou Yongsheng), which was founded in 1992 and is situated inZhifangtou Industrial Zone, Cangzhou, with a total area of 60 acres and a building area of 20,000 square meters.     Our companyemploys 17o staff members and specializes in the casting and machining of products made from various materials, includingstainless steel of different grades, duplex stee, ductile iron/grey iron, and aluminum bronze. We have a casting capacity forindividual productsranging from o.1 kg to 3,000 kg. In particular, we have advanced production and machining capabilities for various valve componentspositioning us as a leader in the industry. Currenty, our casting processes incude silica solinvestment casting and sand casting. Our machining equipment comprises 76 CNC lathes,5machining centers, 4 boring machines, 4 verticallathes,as wellas 102 other machines such as grinders, miling machines, EDM, and wire-cuting machines. From mold design and manufacturingto the final product delivery, allprocesses are handled in-house by our company Our products are exported to countries such as the United States, Germany, Singapore, Japan, and South Korea. Our key partners include .Scompanies Crane and Bray, Suzhou Neway, KSB, Spain's TTV, Tianjin Danfoss, Rotork(Shanghail), and the Bejjing Aerospace Department, among others. With the support of our customers, we have earned an excellent reputation in the industry for outstanding quality and continuously improvingservices. We have consistently received positive feedback and high recognition from our clients We warmly welcome friends and partners to visit and provide guidance.We are committed to serving you with full enthusiasm and dedication!  

MaterialOverview Material Standard: ASTM B148 / UNS C95400 Composition: Copper (Cu):≥83% Aluminum (Al): 10-11.5% Iron (Fe):3-5% Manganese (Mn):0.5-1.5% C95400 is a high strength aluminum bronze alloy with excellent corrosion resistance in seawater and aggressive environments. It's deal for marine valvecomponents that require durability and precision.     Key Features Excellent resistance to seawater and saline media High strength and impact resistance - reliable in frequent operation Anti-dezincification and erosion-resistant Good casting performance and tight dimensional tolerances Compatible with soft seat materials such as EPDM, NBR, and Viton

The common valve disc materials for middle-line butterfly valves are as follows, with each material suitable for different working environmentsand media Ductile lron:Known for its good strength, toughness, and impact resistance, ductile iron is commonly used in general industrial applicationsinvolving media such as water and gas. It is cost-effective, but its corrosion resistance is relatively poor.304 Stainless Steet: A widely used stainless steel material, 304 offers good corrosion resistance and is suitable for less aggressive corrosivemedia, such as water, air, and oil.316 Stainless Steel: Compared to 304, 316 stainless steel offers better corrosion resistance, especially in environments with more aggressivemedia like seawater, acidic substances, or saltwater.C9540 Aluminum Bronze: This material provides excellent corrosion resistance, wear resistance, and mechanical strength, and is widely usedin marine, shipbuilding, and chemical industries. Itis suitable for highly corrosive media such as seawater and saltwater.C95800 Aluminum Bronze: With higher strength and enhanced corrosion resistance, C9s800 is particularly suitable for marine environmentsand applications involving corrosive media like acids and chlorides.These materials are selected based on specific application requirements such as temperature, pressure, and the corosiveness of the media.ensuring the most suitable valve disc material for optimal performance.

Selecting the rightbutterfly valve for seawater systems is essential to ensure long-term reliability, corosion resistance, and safe operation in marineapplications. Seawater presents unique challenges due to its corrosive nature and continuous exposure to harsh operating conditions. 1. MaterialSelection Material choice is the most critical factor for seawater systems. Components in direct contactwith seawater must provide excellent corosion resistance.Commonly recommended materials include: Bronze (e.g. C95400 aluminum bronze) for valve discs Ductile iron or carbon steel bodies with suitable coatings Stainless steel or corrosion-resistant alloys for shaft Using improper materials may lead to corrosion, leakage, and premature valve failure. 2. Valve Seat Design Both soft seated and metal seated butterfly valves can be used in seawater systems, depending on operating conditions. Soft seated valves provide excellent sealing performance and are suitable for most seawater cooling and ballast systems Metal seated valves are preferred for higher temperatures or severe service conditions The correct seat selection improves sealing reliability and extends service life. 3. Pressure and Temperature Ratings Seawater systems operate under different pressure and temperature conditions depending on vessel type and system design. Butterfly valves mustbeselected with appropriate pressure ratings to ensure safe operation. Always verify: Design pressure/Operating temperature/Applicable marine standards 4. Compliance with Marine Classification Requirements For shipbuilding projects, butterfly valves must meet the requirements of marine classification societies such as ABS, DNV, CCS, and LR. Valves should be supplied with: Material traceability/Pressure test records/Inspection and certification documents This ensures smooth approval during vessel construction and commissioning. 5. Manufacturer Experience and Quality Control Choosing an experienced marine valve manufactureris as important as selecting the valve itself. Manufacturers with marine application experienceunderstand classification rules, seawater corrosion challenges, and quality control requirements. Working with a reliable manufacturer reduces project risk and ensures consistent product quality. Conclusion Proper selectionof butterfly valves for seawater systems requires careful consideration of materials,seat design, operating conditions, and certificationrequirements. Awell-selected valve improves system reliability, reduces malintenance costs, and ensures long-term marine performance.