Specification

DN100 PN16 Stainless Steel High-Temp Metal Seal Flange Ball Valve

I. Product Overview

TIANYU high-temperature metal seal ball valve is a precision flow control device engineered for extreme industrial conditions, with a focus on oil and gas applications. Available in both floating and trunnion structures, it features flange connections and metal-to-metal sealing to withstand high temperatures, corrosive media, and varying pressures. Constructed with stainless steel for durability and corrosion resistance, it handles media such as oil, water, steam, LNG, and liquid oxygen. Equipped with versatile drive options (manual, pneumatic, electric, hydraulic), it balances reliability and adaptability, making it a critical component in high-stress industrial systems.

II. Key Attribute Parameters

Size Range: DN15-DN150 (1/2″-6″), covering small to medium-diameter pipelines to meet flow requirements in equipment interfaces, process loops, and transmission lines.
Pressure Rating: 1.6MPa-10.0MPa (PN16-PN100), with test pressures including 2.4-15.0MPa for strength tests and 1.76-11.0MPa for seal tests, ensuring stability under high pressure.
Temperature Range: -196℃-550℃, with material-specific adaptations (e.g., cryogenic alloys for low temps, heat-resistant steels for high temps) to maintain performance across extreme thermal conditions.
Material Configuration:
- Body & Ball: Stainless steel (304/316), offering corrosion resistance; 316 variants enhance resistance to acidic or chloride-rich media (e.g., offshore oil fields).
- Seal: Metal-to-metal (stainless steel/Stellite-coated), designed to withstand high temps without degradation, unlike soft seals.
- Trim: Alloy steel stems with surface treatment (nitriding) for wear resistance, ensuring smooth operation over cycles.
Connection Type: Flange (ANSI/DIN/JIS standards), with raised face (RF) for secure, leak-free integration with pipeline systems, facilitating easy installation and maintenance.
Drive Modes: Manual (worm gear/handwheel), pneumatic, electric, hydraulic, with worm gear reducing operating torque by 50% for manual operation of medium-diameter valves.
Standards Compliance: Manufactured to industry norms, with testing protocols including air pressure tests (0.6MPa) and compliance with quality management systems, ensuring reliability in critical applications.

Product Overview

III. Structural Features

Dual Structure Options:
- Floating Ball Design: The ball “floats” between seats, with upstream pressure pushing it against the downstream seat to form a self-tightening seal. Ideal for medium-pressure systems (≤4.0MPa), it simplifies structure while ensuring tightness at low pressures.
- Trunnion-Mounted Design: The ball is fixed by upper and lower trunnions, distributing pressure loads to prevent displacement. Suitable for high-pressure systems (≥6.4MPa), it reduces seal wear and ensures stability in flow surges.
High-Temp Metal Sealing: Precision-machined metal seats and ball surfaces (Ra ≤0.8μm) create a bubble-tight seal. Unlike soft seals (PTFE), metal seals resist degradation at 550℃, making them suitable for steam, hot oil, and high-temperature gas applications.
Flange Connection: Standardized flange dimensions ensure compatibility with global pipeline systems, providing a robust, leak-proof joint that withstands thermal expansion and pressure fluctuations—critical for long-term reliability in outdoor or buried pipelines.
Versatile Drive Integration: Drive components (gearboxes, actuators) are modular, allowing easy switching between manual and automated operation. Pneumatic/electric drives enable remote control, while manual options suit simple, low-frequency operations.

IV. Manufacturing Processes

Material Selection & Inspection: Stainless steel raw materials (304/316) undergo spectral analysis to verify chemical composition (e.g., 316: 16-18% Cr, 10-14% Ni, 2-3% Mo) for corrosion resistance. Forgings or castings are ultrasonic-tested to eliminate internal defects (cracks, shrinkage).
Precision Machining:
- Ball & Seal Surfaces: CNC grinders achieve ball roundness ≤0.01mm and surface finish Ra ≤0.8μm; seats are lapped to match ball contours, ensuring uniform contact for tight sealing across temperature cycles.
- Flange & Body: CNC lathes machine flange sealing faces to flatness ≤0.05mm, with bolt holes drilled to ±0.1mm tolerance for alignment with pipeline flanges.
Heat Treatment: Metal seal components undergo solution annealing (1050-1100℃) to enhance grain structure, improving high-temperature strength. Stems are nitrided (surface hardness ≥800HV) to resist wear in frequent operation.
Assembly & Testing:
- Seal Assembly: Metal seats are pre-loaded with springs to compensate for thermal expansion, ensuring consistent contact with the ball at extreme temps.
- Performance Testing: Each valve undergoes:
  - Strength test (1.5×rated pressure) for 30 minutes to verify structural integrity.
  - Seal test (1.1×rated pressure) with no visible leakage.
  - High-temperature cycle test (-196℃ to 550℃) to validate seal stability under thermal stress.

Valve Details

V. Product Advantages

Extreme Temperature Adaptability: Metal-to-metal sealing and heat-resistant materials maintain performance from -196℃ (LNG, liquid oxygen) to 550℃ (superheated steam), outperforming soft-sealed valves limited to ≤200℃.
Reliable Sealing: Floating design ensures tightness at low pressures, while trunnion design handles high-pressure surges—both achieving bubble-tight shut-off to prevent leaks in hazardous media (e.g., flammable gases, toxic chemicals).
Corrosion Resistance: Stainless steel construction (304/316) resists rust, chloride attack, and chemical erosion, making it suitable for offshore oil fields, chemical plants, and saltwater environments.
Flexible Operation: Multiple drive options adapt to diverse scenarios—manual for simple systems, pneumatic/electric for automated process control, hydraulic for high-torque requirements in large-diameter valves.
Broad Media Compatibility: Handles liquids (oil, water), gases (natural gas, LPG), and cryogens (LNG), with anti-sulfur variants available for H₂S-containing media in oil and gas fields.

Application

VI. Application Fields

Oil & Gas Industry: Used in upstream (wellhead gathering lines), midstream (LNG storage/transport), and downstream (refinery process loops) to control crude oil, natural gas, and refined products, withstanding high temps and corrosive impurities.
Power Generation: Regulates high-temperature steam in boiler feed lines, turbine bypass systems, and thermal fluid loops, where metal seals resist degradation from continuous heat exposure.
Chemical & Petrochemical: Manages corrosive media (solvents, acids) and high-temperature reaction products in reactor outlets and distillation columns, with stainless steel resisting chemical attack.
Marine & Offshore: Suitable for shipboard fuel systems, ballast water lines, and offshore platform pipelines, with flange connections ensuring reliability in vibration-prone environments.
Cryogenics & Industrial Gases: Controls LNG, liquid oxygen, and liquid nitrogen in storage and transfer, with low-temperature materials preventing brittle fracture at -196℃.