TIANYU DN500 900LB Pneumatic Cryogenic Top Entry Ball Valve: API 6D-Compliant Solution for Extreme Low-Temperature Industrial Flow Control

I. Product Overview

II. Key Attribute Specifications

A. Dimensional and Pressure Parameters

• Nominal Diameter: DN500 (20-inch), catering to large-flow pipeline requirements in industrial cryogenic systems. In LNG transfer applications, a DN500 valve can handle flow rates exceeding 1000 m³/h, ensuring efficient media distribution.
• Pressure Rating: 900LB (equivalent to Class 900, approximately 15.5MPa working pressure), compliant with high-pressure cryogenic storage and transportation systems. This rating ensures the valve can withstand the rigorous pressure demands of LNG terminals and large-scale air separation units.
• Temperature Range: Engineered to operate continuously between -196℃ (boiling point of liquid nitrogen) and 100℃. Special thermal insulation layers are integrated to minimize cold energy loss and prevent external moisture condensation on the valve surface, maintaining operational stability in extreme temperature differentials.

B. Material Composition

• Valve Body and Ball:
  • For standard cryogenic applications, low-temperature carbon steel (ASTM A352 LCB) is used, offering exceptional toughness at sub-zero temperatures. LCB steel undergoes quenching and tempering to achieve a Charpy impact energy of ≥27J at -46℃, preventing cold brittleness.
  • In corrosive cryogenic environments (e.g., LNG with high sulfur content), stainless steel (ASTM A351 CF8M/316L) is employed. Its molybdenum content enhances resistance to pitting and crevice corrosion, ensuring longevity in aggressive media.
• Sealing Components:
  • Primary seals utilize polytetrafluoroethylene (PTFE) with spring pre-loading. PTFE retains elasticity at low temperatures and exhibits low friction, ensuring a reliable seal despite thermal contraction.
  • For high-pressure cryogenic scenarios, metal-to-metal seals (e.g., Inconel 625 coating) are available, withstanding high pressure differentials and offering superior wear resistance.

C. Structural and Operational Features

• Top-Entry Design: The valve body features a top-mounted access flange, allowing internal components (ball, stem, seals) to be removed and replaced without disconnecting pipeline flanges. This design reduces maintenance downtime by over 50% compared to side-entry valves, critical for minimizing production losses in continuous-process industries.
• Stem Sealing: A multi-layer sealing structure combines graphite packing and O-rings, preventing cryogenic media leakage and external air ingress. This design maintains the low-temperature environment inside the valve and ensures operational safety.
• Actuation: Equipped with a pneumatic actuator (double-acting or spring-return), enabling rapid 90° rotation for quick flow adjustment. For safety-critical applications (e.g., LNG emergency shutdown), spring-return actuators provide fail-safe closure upon air supply loss.
• The Cryogenic Top-Entry Ball Valve, as an important on/off component in the cryogenic pipeline system, is an important part of the petrochemical industry, air separation, and natural gas industry. The structure of Top-Entry Ball Valve can realize online maintenance, and is suitable for low-temperature liquid or gas media, such as liquefied natural gas (LNG), liquefied petroleum gas (LPG), liquid hydrogen, liquid oxygen, ethylene and other conditions. Compared with the Side-Entry ball valve under the same conditions, Top-Entry Ball Valve is more convenient to maintain with a wider scope of application, and is more common.
  Size：NPS1/2″~56″
  Temperature： -196°C~550°C
  Pressure：Class 150~Class 2,500
  Materials：Carbon Steel, Stainless Steel, Duplex, Inconel, Monel, Bronze, Titanium Alloy
  Standard：AP16DBS 5351ASME B1634SO17292
  Face to Face： ASME B16.10API6D
  End Connection：ASME B16.5ASME B1647,ASME B1625ASME B16.11
  Test Standard： ISO 5208,API6DAPI598
  Operators：Manual, Worm Gear, Electric Actuator, Pneumatic Actuator