Specification

CE DN50 CL1500 F316 Top-Entry Butt-Weld Trunnion Mounted Cryogenic Ball Valve

I. Product Overview

TIANYU CE DN50 CL1500 F316 top-entry butt-weld trunnion mounted cryogenic ball valve is a high-performance flow control solution tailored for extreme low-temperature and high-pressure industrial scenarios. Leveraging a top-entry design and butt-weld connections, it enables efficient in-line maintenance, minimizing system downtime. Constructed with F316 stainless steel trim and compatible with cryogenic service conditions, it ensures reliable sealing and corrosion resistance across oil & gas, petrochemical, and cryogenic processing systems. Backed by CE certification, it meets stringent safety and quality standards for critical applications.

II. Key Attribute Parameters

Size: DN50 (2″), optimized for medium-diameter pipeline flow control in high-pressure, cryogenic environments.
Pressure Rating: CL1500 (26.0MPa), engineered to withstand intense pressure in oil & gas transmission, refinery, and high-pressure process systems.
Temperature Range: -46°C to 80°C (matching cryogenic service needs, suitable for media like LNG, liquid nitrogen).
Material Configuration:
- Body: LF2 (ASTM A350), a low-temperature carbon steel variant, delivering high toughness to resist brittle fracture in cold operating conditions.
- Trim: F316 stainless steel (ASTM A182), providing excellent corrosion resistance against chloride, sulfide, and acidic media common in industrial processes.
- Seats: DEVLON (high-strength polymer) or RPTFE (filled PTFE), selected for low-temperature resilience, chemical resistance, and tight sealing performance.
End Connections: Butt-weld (BW per ASME B16.25), ensuring a leak-tight, high-integrity connection in high-pressure, high-temperature pipelines.
Actuation: Manual gear-operated (handwheel), enabling precise torque control for smooth operation in hazardous or hard-to-reach installations.
Certifications: CE, validating compliance with EU pressure equipment directives, reducing regulatory hurdles for global projects.

III. Structural Features

Top-Entry Design: Internal components (ball, seats, stem) are accessible via a removable bonnet, facilitating in-line maintenance. This cuts maintenance downtime by up to 50% compared to fully disassembled valves, critical for continuous-process industries like petrochemical refining.
Trunnion-Mounted Ball: The ball is supported by trunnions (F316) at the top and bottom, effectively distributing pressure loads. This design eliminates ball “floating,” reducing seat wear and ensuring stable, reliable sealing even under high differential pressure (up to CL1500).
Cryogenic Seal Compatibility:
- DEVLON seats: Engineered polymer with low friction properties, maintaining elasticity at -46°C, making it ideal for cryogenic liquid applications (e.g., LNG, liquid CO₂).
- RPTFE seats: Filled PTFE compound resists chemical attack, achieving ANSI/FCI Class VI leakage (≤0.1 bubbles/min) to prevent leaks of toxic or flammable media.
Butt-Weld Ends: Full-penetration weld joints (per ASME B31.3) ensure zero leakage in high-pressure, high-temperature systems. Weld ends are prepped for automatic welding, minimizing field installation errors and enhancing joint integrity.
Anti-Blowout Stem: An integral stem design with a retention shoulder prevents stem ejection under pressure, boosting operator safety in high-risk applications such as gas transmission.

Product Overview

IV. Manufacturing Processes

Material Preparation: LF2 forgings undergo ultrasonic testing to detect internal defects; F316 trim components are verified via spectral analysis to confirm alloy composition (Cr 16 – 18%, Ni 10 – 14%, Mo 2 – 3%), ensuring corrosion resistance.
Precision Machining: CNC turning centers machine the body, bonnet, and ball to tight tolerances (±0.05mm). Trunnions are ground to a surface finish of Ra ≤0.8μm, enabling smooth ball rotation and even load distribution.
Seat Assembly: DEVLON/RPTFE seats are compression-molded and machined to match the ball’s curvature. Seats are bonded to the body using high-strength adhesive and then lapped against the ball for uniform contact and optimal sealing.
Weld Preparation: Butt-weld ends are beveled per ASME B16.25, with purge channels to prevent oxidation during welding. Pre-weld heat treatment (for LF2) relieves internal stress, enhancing weld integrity and long-term performance.
Testing:
- Hydrostatic Test: The valve body is tested at 1.5×the rated pressure (39.0MPa for CL1500) for 30 minutes to verify structural integrity and pressure resistance.
- Gas Leak Test: Seat leakage is tested with nitrogen at 0.6MPa, meeting ANSI/FCI Class VI leakage standards for RPTFE/DEVLON seals.
- Cryogenic Test: Valves fitted with DEVLON seats undergo -46°C immersion testing to validate sealing performance in low-temperature environments.

Valve Details

Product Packaging

Using sturdy export wooden crates with moisture-proof cushioning inside. Valves are independently secured. Crate surfaces mark specifications, model, destination, with inspection labels, meeting export shipping standards.
6″,CL600, RPTFE 80℃ to -29℃

TIANYU’s Top – Entry Welded – End Trunnion – Mounted Ball Valve excels in maintenance, sealing, and adaptability. Ideal for oil, chemical, power, and water sectors. Customize with materials like duplex steel for extreme corrosion, or add actuators for automation, fitting your system’s unique demands.

V. Product Advantages

In-Line Maintainability: The top-entry access design reduces maintenance time by half, avoiding costly pipeline disassembly in refineries, offshore platforms, and other continuous-process settings.
High-Pressure Stability: The trunnion-mounted ball design eliminates seat extrusion under CL1500 pressure, reducing the risk of unplanned shutdowns in oil & gas transmission and high-pressure process systems.
Cryogenic Sealing Capability: DEVLON seats handle -46°C cryogenic temperatures, while RPTFE seats resist chemicals in the -29°C to 80°C range, adapting to diverse low-temperature and corrosive process conditions.
Corrosion Resistance: The combination of an LF2 body (low-temperature toughness) and F316 trim (corrosion resilience) ensures a service life of over 20 years in harsh environments, including offshore installations and chemical plants.
Safety and Compliance: CE certification aligns with EU PED standards, reducing regulatory risks and ensuring suitability for global safety-critical projects.

Application

VI. Application Fields

Oil & Gas Transmission: Controls high-pressure natural gas, crude oil in pipelines, with the CL1500 rating and cryogenic compatibility making it ideal for cold-climate regions and LNG-related infrastructure.
Petrochemical Refining: Regulates hydrocarbons, solvents in reactors and distillation columns, leveraging corrosion-resistant F316 trim and reliable sealing to maintain process efficiency.
Cryogenic Processing: Manages LNG, liquid nitrogen in terminals and processing facilities, with DEVLON seats ensuring tight sealing at -46°C for safe, efficient cryogen handling.
Industrial Gases: Handles high-pressure industrial gases like CO₂, ammonia in storage and distribution systems, with RPTFE seals preventing toxic leaks and ensuring operational safety.