Hard seal butterfly valve

Descripción general del producto

Este Electric Three Eccentric Butterfly Valve (Standard Model: D943H Flanged, D973H Wafer) is an industrial-grade valve for harsh working conditions, with intelligent electric actuation as the control core and 3D triple offset metal hard seal as the high-performance main body. The core adopts 3D triple offset design (shaft eccentricity, disc eccentricity, sealing cone eccentricity), realizing full-stroke friction-free and low-torque operation.

Equipped with a dedicated intelligent electric actuator, it can be seamlessly connected to PLC/DCS industrial automatic control systems for remote precise on-off, flow proportional regulation and real-time status feedback. It features bidirectional zero leakage, high temperature and erosion resistance, long service life and high pressure stability. Fully compliant with API 609, GB/T 12238, ISO 5211 and other international standards, it covers sizes DN50-DN1200 (NPS 2″-48″), widely used in key industrial pipelines with high temperature, high pressure and precise automatic control requirements, such as power plants, petrochemical, oil & gas storage and transportation, metallurgy, coal chemical industry and municipal heating.

Key Features

1. Core Triple Offset Hard Seal Structure, Friction-Free Operation, Zero Leakage & Long Service Life

   Fully focused on the core design of three eccentric (triple offset), it completely solves the industry pain points of ordinary butterfly valves such as easy seal wear, poor high temperature resistance and serious internal leakage:

   1. Optimized 3D triple offset design ensures the sealing surface of the disc only contacts the valve seat at the moment of full closing, and completely separates after opening, no sliding friction during the whole stroke. Operating torque is over 60% lower than ordinary concentric butterfly valves, with a cycle life of more than 10,000 times, 5-8 times longer than standard soft seal butterfly valves, ideal for frequent operation conditions;
      

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   2. High-strength metal seal pair: the sealing surface of the seat and disc adopts plasma spray welded Stellite hard alloy / supersonic sprayed tungsten carbide, with surface hardness up to HRC40-65, excellent high temperature resistance, erosion resistance, anti-seizure and anti-aging performance, perfectly suitable for harsh working conditions such as high temperature steam ≤425℃, media containing solid particles and dust;
      

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   3. Elastic metal seat self-energized bidirectional sealing: self-tightening sealing is realized by medium pressure, the higher the pressure, the tighter the seal. It can automatically compensate for thermal expansion and contraction under high and low temperature working conditions, avoiding high temperature jamming and sealing failure, reaching ANSI/FCI 70-2 Class V bidirectional zero leakage.
      

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1. Core Intelligent Electric Actuation System, Precise Control & Stable Reliability

   Fully focused on the core demand of electric actuation, optimized for high torque conditions of triple offset butterfly valves with full adaptability:

   1. Standard intelligent quarter-turn electric actuator, full coverage of on-off type / regulating type: on-off type realizes fast on-off and in-position signal feedback; regulating type supports 4-20mA analog input and output, accurately controls valve opening to realize flow proportional regulation, with control accuracy up to ±0.5%;
      

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   2. Full protection adaptation: standard IP67 protection grade, optional IP68 waterproof and dustproof, ExdⅡBT4/CT4 explosion-proof grade, suitable for outdoor, humid, flammable and explosive harsh conditions; built-in overload protection, overheat protection, over-torque protection, effectively avoiding motor burnout and valve damage, ensuring stable operation;
      

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   3. Flexible and convenient operation: supports both local panel operation and remote automatic control, with built-in LCD display and opening indication, visualizing valve status; standard emergency manual handwheel, which can manually open and close the valve under power failure, signal interruption and equipment failure conditions, ensuring emergency operation safety of the pipeline; reserved standard communication interface, supports MODBUS, PROFIBUS and other industrial bus protocols, seamlessly connecting to various industrial automatic control systems.
      

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2. Dual Connection Options, Easy Installation & Wide Adaptability

   Optional flanged type and wafer type connection, face to face dimension fully complies with API 609 and GB/T 12221, perfectly compatible with GB, ANSI, JIS, DIN standard flanges, no custom modification required, with strong versatility. Flanged structure has stronger pressure bearing capacity, suitable for high pressure and long-distance pipeline conditions; wafer type compact and lightweight body greatly saves installation space, suitable for narrow spaces and dense pipeline layouts.

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3. Full Material Adaptation & Complete Safety Protection

   Core pressure-bearing parts are available in WCB carbon steel, 304/316 stainless steel, duplex steel, WC6 Cr-Mo steel, etc., with pressure rating covering PN16-PN100 (Class150-Class600), excellent acid, alkali and chloride corrosion resistance. Standard anti-static device, blow-out proof stem, high temperature flexible graphite packing seal, optional API 607 fire-safe structure, ensuring stable and reliable long-term operation.

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Applications

Power plant boiler high temperature steam pipelines, circulating water systems, flue gas desulfurization and denitrification systems; petrochemical high temperature and high pressure process pipelines, storage and transportation pipe networks; coal chemical high temperature medium pipelines, ammonia synthesis systems; metallurgy blast furnace gas/dust removal systems, high temperature flue gas transmission pipelines; municipal district heating long-distance transmission pipe networks, heat source plant main pipelines; marine high pressure pipelines, seawater desalination systems; waste incineration high temperature flue gas treatment systems.

Resumen del producto

This Electric Three Eccentric Butterfly Valve firmly focuses on the two core advantages of electric intelligent precise control y triple offset high performance hard seal. It features low operating torque, long service life, bidirectional zero leakage, high pressure and high temperature resistance, and strong automatic control adaptability. It perfectly solves the industry pain points of ordinary butterfly valves such as easy seal wear, poor high temperature resistance, serious internal leakage and low automatic control accuracy.

Covering full diameter sizes and strictly complying with global industrial valve standards, it can be seamlessly connected to various industrial automatic control systems. It is the preferred special valve for pipeline on-off and flow regulation under harsh working conditions of high temperature, high pressure and precise automatic control requirements.