Specification

TIANYU Metal Seal Hard-Seal Triple Eccentric Flange Butterfly Valve

I. Product Overview

TIANYU metal seal hard-seal triple eccentric flange butterfly valve is a high-performance flow control device engineered for industrial pipelines. It integrates triple eccentric sealing technology with metal-to-metal hard sealing, available in both laminated sealing and full metal sealing options. Constructed with forged bodies to avoid casting defects and ensure structural integrity, this valve delivers zero leakage, low operating torque, and long-term reliability in harsh conditions. Compliant with international standards, it is widely used in energy, petrochemical, power, and low-temperature systems, serving as a critical component for shut-off and regulation of complex media.

II. Key Attribute Parameters

Size Range: 2″-144″ (DN50-DN3600), covering small to extra-large pipeline systems to meet diverse industrial flow requirements.
Body & Disc Materials: Forged carbon steel (Q235A/WCB), stainless steel (CF8/CF8M), and aluminum bronze, selected based on media corrosiveness and operating conditions.
Sealing Configuration: Metal hard seal with surface materials matching body/disc materials; laminated sealing options include stainless steel plates with graphite, carbon fiber, or PTFE inserts for enhanced adaptability.
Pressure & Temperature Ratings: Compatible with pressure classes up to PN64 (10MPa) and temperature ranges from cryogenic (liquefied gas) to high-temperature (steam systems), depending on material selection.
Connection Type: Flange connection conforming to international standards (e.g., ASME B16.5), ensuring secure integration with pipeline systems.
Standards Compliance: Design and manufacture per API 609, EN 593; testing and inspection per API 598, EN 12266, ISO 5208; marking per MSS-SP-25.

Product Overview

III. Structural Features

Triple Eccentric Design: Building on double eccentric structure, a third angular eccentricity is added between the valve body centerline and conical seat sealing face. This ensures the disc’s sealing ring rapidly engages or disengages from the seat during operation, eliminating friction and squeezing between sealing surfaces—reducing wear and extending service life.
Friction-Free Operation: The triple eccentric layout minimizes contact between the disc and seat during opening/closing, lowering operating torque and enabling smooth actuation even for large-diameter valves.
Anti-Blowout Stem: Designed per API 609, the stem features a blowout-proof structure to prevent accidental dislodgement under high pressure, enhancing operational safety.
Self-Lubricating Bearing: Custom bushings reduce actuation torque and prevent stem seizing during frequent operations, ensuring consistent performance over time.
Robust Sealing: Metal-to-metal hard sealing surfaces are precision-machined for zero leakage; laminated sealing combines metal and flexible materials to adapt to thermal expansion and contraction, maintaining tightness across cycles.

IV. Manufacturing Processes

Forged Body Construction: Adopts forging instead of casting to eliminate internal looseness and structural defects, enhancing body strength and resistance to axial forces—critical for high-pressure applications.
Precision Machining: Sealing surfaces and eccentric components are CNC-machined to tight tolerances, ensuring the triple eccentric design functions as intended. Laminated seals undergo layered pressing to ensure uniform material distribution.
Non-Destructive Evaluation (NDE): Optional NDE inspections (e.g., ultrasonic, radiographic testing) verify material integrity, especially for critical applications like nuclear power.
Rigorous Testing: Each valve undergoes API 598-compliant testing, including hydrostatic shell tests (1.5×rated pressure), seat leakage tests (1.1×rated pressure), and operational cycle tests to validate zero leakage and durability.

Valve Details

V. Product Advantages

Zero Leakage Performance: Metal hard sealing and triple eccentric design achieve bubble-tight shut-off, critical for preventing media loss in high-risk systems (e.g., flammable gases, toxic chemicals).
Low Operating Torque: Friction-free sealing and self-lubricating bearings reduce actuation force, enabling efficient operation even for large-diameter valves (144″) and lowering energy consumption for automated systems.
Durability & Longevity: Forged bodies and wear-resistant sealing surfaces resist erosion, corrosion, and thermal stress, extending service life to 15+ years in typical industrial environments.
Versatility: Available in laminated or full metal sealing, with material options for cryogenic, high-temperature, and corrosive media—adapting to diverse applications from LNG systems to steam pipelines.
Safety & Compliance: Compliant with API, EN, and ISO standards, with anti-blowout stems and NDE options to meet strict safety requirements in nuclear, petrochemical, and power industries.

Application

VI. Application Fields

District Energy Systems: Thermal power stations, heat exchange stations, and regional boiler plants—regulating hot water loops and steam pipelines.
Petrochemical & Refining: Brine, carbon dioxide vapor, and hydrocarbon systems in propylene/ethylene plants, coking units, and desulfurization processes.
Nuclear & Thermal Power: Containment isolation, seawater desalination, and core spray systems in nuclear plants; condenser cooling and pump isolation in thermal power stations.
Low-Temperature Systems: Liquefied natural gas (LNG) storage, transportation, and gasification plants, handling cryogenic media reliably.
Pulp & Paper: Steam isolation, boiler water, and lime/mud pipelines, withstanding abrasive and high-temperature media.
Natural Gas & Oil: Flare gas, acid gas isolation, and oil storage systems, ensuring safe shut-off in high-pressure hydrocarbon environments.