Specification

DN100 PN16 Triple Offset High-Temp Metal Seal Flange Butterfly Valve

I. Product Overview

TIANYU high-temperature butterfly valve is a precision flow control device engineered for extreme thermal conditions, leveraging a triple offset design and metal-to-metal sealing. Built to handle high-temperature media such as steam, hot oil, and industrial gases, it combines structural durability with reliable shut-off performance. Constructed from heat-resistant materials (carbon steel, stainless steel, alloys), it integrates flange connections for secure pipeline integration and supports diverse actuation modes. Compliant with international standards, it serves as a critical component in power, petrochemical, and metallurgical systems where stability under high temperatures is paramount.

II. Key Attribute Parameters

Size Range: DN50~DN1200 (2″~48″), covering small to large-diameter pipelines to meet flow requirements in boiler lines, process loops, and high-temperature transmission networks.
Pressure Rating: PN16~PN40 (Class 150~300), with PN16 (1.6MPa) and Class 150 as common specifications, adapting to medium-pressure high-temperature systems.
Temperature Range: -20℃~600℃, with material-specific limits—carbon steel (WCB) up to 425℃, stainless steel (310S) up to 600℃, suitable for superheated steam and high-temperature industrial fluids.
Material Configuration:
- Body: Carbon steel (WCB), stainless steel (304/310S), or alloy steel (WC6), selected for heat resistance and structural strength under thermal cycling.
- Disc & Seat: Disc in heat-resistant alloy (12Cr1MoV); seat with metal-to-metal sealing (stainless steel/Stellite-coated), resisting oxidation and wear at high temps.
Connection Type: Flange (RF/RTJ per ASME B16.5), ensuring leak-tight integration with pipeline systems, compatible with high-temperature flange gaskets (graphite).
Operation: Manual (handwheel/gear), electric, or pneumatic, with gear operation reducing torque for large-diameter valves in high-temperature environments.
Standards Compliance: Design per API 609, EN 593; testing per API 598; temperature-pressure ratings per ASME B16.34, ensuring compatibility with global industrial standards.

III. Structural Features

Triple Offset Design: Three eccentricities (stem, seat centerline, and sealing surface) eliminate friction between the disc and seat during opening/closing. This reduces wear from thermal expansion, ensuring smooth operation even after prolonged exposure to 600℃ media—critical for maintaining performance in high-temperature cycles.
Metal-to-Metal Sealing: Precision-machined metal seats and disc surfaces (Ra ≤0.8μm) form a tight seal, with Stellite coating (hardness ≥55 HRC) resisting oxidation and erosion at high temps. Unlike soft seals (PTFE), metal seals avoid degradation, ensuring reliability in superheated steam systems.
Heat-Resistant Construction: Body and internal components use materials with low thermal expansion coefficients (e.g., 310S stainless steel) to minimize deformation under temperature fluctuations, preventing leakage from thermal stress.
Streamlined Flow Path: The disc’s aerodynamic design reduces pressure drop (≤8% of inlet pressure at full flow), improving energy efficiency in high-temperature fluid systems like boiler feed lines.
Modular Actuation: Compatible with manual and automated drives—electric actuators feature high-temperature insulation (class H) to withstand ambient heat, while pneumatic actuators use heat-resistant diaphragms for stable operation.

Product Overview

Small opening torque for flexible and convenient operation, saving energy.
Tri-eccentric structure ensures a tighter seal as the valve closes, achieving leak-free performance.
Resistant to high pressure, corrosion, and wear, ensuring a long service life.
Utilizes an elastic stainless steel sealing ring installed on the valve body to achieve true zero leakage.
Adjustable sealing, maintaining leak-free performance after 100,000 life cycles.
Special sealing structure ensures excellent sealing performance under both high-temperature and room-temperature conditions, without stress deformation.
Axial positioning device solves the problem of leakage caused by wear of the axial sealing surface, allowing the transmission actuator to be installed in any direction.
Suitable for applications in clean pipelines in the food, pharmaceutical, chemical industries, as well as industrial environmental protection, water treatment, high-rise buildings, water supply and drainage pipelines, for opening, closing, or regulating media flow.

Valve Details

Flange face finish

The ASME B16.5 code requires that the flange face(raised face and flat face) has a specific roughness to ensure that this surface be compatible with the gasket and provide a high quality seal.
Radiator design

The radiator is designed to insulate heat and protect the electric actuator.For the temperature higher than 300 degree,we will use this design.

V. Product Advantages

High-Temp Stability: Materials and design withstand 600℃, outperforming standard butterfly valves limited to ≤200℃, making it suitable for superheated steam and high-temperature industrial fluids.
Low Wear Operation: Triple offset design eliminates friction, reducing seal wear by 50% compared to standard eccentric butterfly valves, extending service life in frequent-operation systems.
Reliable Sealing: Metal-to-metal sealing resists oxidation and erosion, maintaining tightness even after 10,000+ cycles in 400℃ media—critical for preventing energy loss in boiler systems.
Energy Efficiency: Streamlined flow path minimizes pressure drop, reducing pump energy consumption by 8~10% in high-flow high-temperature lines.
Broad Compatibility: Adaptable to diverse high-temperature media (steam, hot oil, flue gas), with material options for corrosive high-temp environments (e.g., 316 stainless steel for acidic gases).

Application

VI. Application Fields

Power Generation: Controls superheated steam in boiler feed lines, turbine bypass systems, and heat exchanger loops, ensuring stable flow in thermal power plants.
Petrochemical Industry: Regulates high-temperature process fluids (e.g., molten sulfur, hot hydrocarbons) in refinery cracking units and distillation columns.
Metallurgy: Manages high-temperature gases and cooling water in steel mill rolling lines and smelting furnaces, withstanding thermal cycling from 20℃ to 500℃.
Industrial Heating: Controls hot oil and thermal fluids in district heating networks and process heating systems, ensuring efficient energy transfer without leakage.