Technical Specifications:
◎ Size Range: DN15 – DN600 / NPS ½” – 24”
◎ Pressure Class: Class 150 – 2500 / PN20 – PN420
◎ Temperature Range: -196°C to +80°C
◎ Body Materials: Forged Stainless Steel, LTCS, Nickel Alloys
◎ Seat Options: PCTFE, PTFE, or Metal-to-Metal
◎ Standards: API 6D, ASME B16.34, BS 6364, ISO 28921, NACE MR0175
◎ Applications: LNG terminals, air separation units, cryogenic tanks, cold boxes, low-temperature transportation pipelines.
Naishi cryogenic trunnion mounted ball valves are designed for safe and efficient operation in ultra-low temperature environments, such as LNG, liquid nitrogen, liquid oxygen, and other cryogenic services. Engineered in accordance with API 6D, ASME B16.34, and BS 6364 standards, these valves feature forged construction, extended bonnets, and a range of safety-enhancing options to ensure performance in demanding conditions down to -196°C.
Key Features:
● Ultra-Low Temperature Design – Suitable for cryogenic media from -196°C to +80°C, ensuring sealing performance and operational safety.
● Extended Bonnet Structure – Prevents cold transmission to packing, reduces frost buildup, and ensures reliable stem sealing.
● Forged Steel Body – High-strength forged components improve pressure resistance, fatigue life, and suitability for harsh environments.
● Anti-Sulfide Stress Cracking – Available in NACE MR0175-compliant materials for sour gas and hydrogen sulfide environments.
● Anti-Static Design – Built-in conductive spring ensures electrostatic discharge between ball, stem, and body, enhancing operational safety.
● Drip Plate Design – Prevents cold condensate from dripping onto actuators or ground structures, reducing icing and improving safety.
● Low Emission Sealing – Stem packing designed to meet ISO 15848 and API 622 low fugitive emission standards.
● Trunnion Support Design – Reduces seat wear and operating torque under pressure fluctuations.
● Double Block and Bleed (DBB) – Allows for safe maintenance and cavity isolation under pressure.
● Emergency Grease Injection – Sealant injection ports on seat and stem ensure emergency sealing in case of leakage.
● Drain and Vent Ports – Located at cavity bottom and top for depressurization, cleaning, and safety operations.
● Full Bore or Reduced Bore – Available in both configurations to match different flow and pressure requirements.
● Stem Extension – Allows for above-ground operation of buried or cold-insulated valves; extension height customizable.
● Actuation Compatibility – Supports manual, pneumatic, electric, and hydraulic actuators.
● Customizable End Connections – Flanged or butt-welded ends available; weld sleeves prevent heat damage during installation.
● 100% Cryogenic Tested – Each valve is subjected to strict cryogenic testing to ensure performance and safety.
