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DNV Certification in Marine Butterfly Valves
DNV certification plays a vital role in marine butterfly valves, signifying that the product complies with the standards set by Det Norske Veritas (DNV, formerly DNV-GL). It is a key requirement for entering the international shipbuilding and offshore engineering markets. 1. What is DNV Certification? DNV (Det Norske Veritas) is a world-leading classification society and risk […]
Application of 2205 and 2507 in Marine Valves
2205 and 2507 are two types of duplex stainless steel that are widely used in marine valves (such as butterfly valves, gate valves, and check valves), particularly in environments where excellent corrosion resistance is required. Below is a comparison of their applications and key characteristics in marine valve usage: I. Comparison of Basic Material Properties […]
SS316 Wafer Type Single Disc Check Valve
Reliable Backflow Protection – Built for Harsh Marine and Industrial Environments Product Overview Our SS316 Single Disc Check Valve is designed for high-performance backflow prevention in demanding environments such as marine systems, chemical plants, and water treatment facilities. Made from 316 stainless steel, it offers exceptional resistance to corrosion, even in seawater and aggressive media. […]
Selection Standard and Application Analysis for Marine Valve
Choosing the right valves for marine systems is crucial to ensure safety, reliability, and long-term performance in harsh offshore environments. Key selection criteria include: 1.1 Material Selection Preferred Material: SS316, Duplex Stainless Steel, Bronze Reason: High corrosion resistance in seawater, brine, and aggressive chemicals Tip: Avoid carbon steel for exposed or submerged applications 1.2 Valve […]
Common Faults and Maintenance of concentric Marine Butterfly Valves
Fault Cause Analysis Solution Leakage Seat aging or wear Replace seat Difficult operation Shaft rust or jamming Clean,lubricate,or replace shaft Corrosion perforation Inadequate corrosion protection Repair by welding or replace valve Handle damage Over-torque operation Replace handle and add torque limiter Tianjin Tanghai Valve Co., Ltd. is a professional marine valve manufacturer, including butterfly valve, […]
Anti-Corrosion Technology for Marine Concentric Butterfly Valves
Body Coating: Epoxy coating, thermal zinc spray, FBE coating. Disc Protection: Stainless steel or copper alloy with surface treatment. Seat Protection: Modified rubber for seawater resistance. Shaft Sealing and Corrosion Prevention: Special coating in shaft sealing chamber + corrosion-resistant O-rings. Tianjin Tanghai Valve Co., Ltd. is a professional marine valve manufacturer, including butterfly valve, check […]
Factors Affecting Sealing Performance of Concentric Soft Seal Butterfly Valves
Key Factors Seat Material Selection: EPDM for seawater, NBR for oil, VITON for high temperature. Machining Precision: Concentricity between valve body, disc, and seat. Installation Position: Horizontal installation is preferred over vertical to avoid self-weight affecting sealing. Torque Control: Excessive or insufficient torque may damage the seat. Key Technical Points Ensure concentricityamong body, disc, and […]
Comparison Between Concentric and Double Offset Marine Butterfly Valves
Item Concentric Butterfly Valve Double Offset Butterfly Valve Structure Disc center aligned with body centerline Disc center offset from body centerline Sealing Type Mainly soft seal Soft+hard seal available Operation Torque Low Slightly higher ApplicationPressure Low to medium pressure(PN6-PN16) High pressure(PN25-PN40) Cost Lower Higher Typical Application General ship pipelines,ballast water systems High-ressure fire system,deck wash system […]
The Processing of Butterfly Valve Fittings
The processing of butterfly valve accessories generally involves multiple steps, with the main goal of ensuring the precision and compatibility of each component. As a common type of regulating valve widely used in industrial pipelines, the processing accuracy of butterfly valve components directly affects the valve’s performance and lifespan. The main components of a butterfly […]
Connection Standard of Dual Plate Check Valve
The connection standard of a Dual Plate Check Valve primarily refers to the standards governing the face-to-face dimensions, flange compatibility, and pressure ratings. These standards ensure that the valve can be installed easily in various pipeline systems with flanged connections. Key Connection Standards for Dual Plate Check Valves: 1. API 594 – Check Valve Face-to-Face and End Connection […]