Technical Specifications:
◎ Size Range: DN25 – DN1000 / NPS 1” – 40”
◎ Pressure Class: Class 150 – 2500 / PN 20 – 420
◎ Temperature Range: -46°C to +650°C (based on materials and coating)
◎ Body Materials: Forged Carbon Steel, Stainless Steel, Duplex, Inconel, Alloy Steel
◎ Hard-Facing Materials: Stellite 6, WC, Cr3C2, Ni60, etc.
◎ Seat Designs: Floating, trunnion mounted, spring-loaded, double piston
◎ Standards: API 6D, API 607, ASME B16.34, ISO 5211, NACE MR0175
◎ Applications: Refining, petrochemical, power generation, coal chemical, metallurgy, high-temperature gas, slurry, ash, catalytic cracking, desulfurization, and other critical services.
Naishi metal seated ball valves are designed for severe service conditions where high temperature, high pressure, corrosive media, or solid-containing fluids prevent the use of soft-seated valves. Engineered for durability and performance, these valves feature advanced metal-to-metal sealing structures, precision hard-facing technologies, and robust forged construction, delivering long-lasting, tight shut-off in the harshest applications.
Key Features:
● Advanced Hard-Facing Technology – Ball and seat are overlaid with hard alloys (such as Stellite, tungsten carbide, chromium carbide, etc.) through HVOF or PTA welding, ensuring high wear and corrosion resistance.
● Reliable Metal-to-Metal Sealing – Ensures zero leakage under high temperature and pressure. Seats are spring-loaded to maintain tight contact with the ball during pressure fluctuations or thermal expansion.
● Self-Cleaning Action – Scraping effect between the ball and the seat removes impurities during opening/closing, preventing buildup and sticking.
● Double Block and Bleed (DBB) – Standard design includes cavity relief function and DBB for isolation and safety.
● Anti-Scuffing Structure – Unique design prevents seat damage during operation under high differential pressure or abrasive service.
● Fire-Safe & Anti-Static – Certified fire-safe design and conductive spring between stem, ball, and body to prevent static discharge.
● Blowout-Proof Stem – Bottom-entry stem with secure retention ensures operational safety.
● Emergency Grease Injection – Seat and stem sealant injection fittings for in-line leakage recovery.
● Drain & Vent Ports – Enable safe cavity cleaning and depressurization.
● Various Sealing Configurations – Optional bi-directional sealing, unidirectional sealing, or double piston effect according to working condition.
● Actuator Ready – Available with manual, electric, pneumatic, or hydraulic actuation.
● Custom Design Available – Special coatings, temperature ratings, and pressure classes available per application.
