Specification
Multi-Level Hard Seal Gear-Operated Lug-Type Triple Offset Butterfly Valve
I. Product Overview
The aluminum bronze multi-level hard seal gear-operated lug-type triple offset butterfly valve is a high-performance flow control solution engineered for large-diameter, demanding pipeline systems. Designed to balance robust sealing, corrosion resistance, and operational efficiency, it integrates triple offset geometry, aluminum bronze construction, and multi-level hard seals to handle abrasive media, high temperatures, and corrosive environments. Suitable for municipal water treatment, marine and offshore, industrial processes, and thermal systems, this valve delivers reliable shut-off and flow regulation in applications where durability and zero leakage are critical. Its lug-type design and gear operation simplify installation and maintenance, making it a versatile choice for large-scale infrastructure and industrial projects.
II. Key Attribute Specifications
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Category
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Details
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Size Range
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DN50~DN1200 (2″~48″), with a focus on large-diameter applications (e.g., DN600) for high-flow pipeline systems.
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Pressure Rating
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Class 150~600 (2.0MPa~10.0MPa), accommodating moderate to high-pressure systems in industrial and municipal settings.
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Temperature Range
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-20°C~425°C, suitable for both cryogenic and high-temperature media (e.g., chilled water, steam, thermal fluids).
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Design Standards
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AWWA C504 (municipal waterworks), ASME B16.34 (valve dimensions), API 609 (butterfly valves for pipeline service).
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Material Composition
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– Body & Lug: Aluminum bronze (ASTM B148 C95800), an alloy with high copper content (≥85%) plus aluminum, iron, and nickel, offering exceptional corrosion resistance in saline and wet environments.
– Disc: K400 (austenitic manganese steel), featuring high hardness (HB ≥400) and toughness, resistant to abrasion from solids and slurries.
– Seal: Multi-level hard seal with alloy coating (e.g., nickel-chromium or stellite), providing metal-to-metal sealing and resistance to high temperatures and wear.
– Stem & Gear: Stainless steel (316) for corrosion resistance, ensuring smooth operation in harsh environments.
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Connection Type
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Lug-type (per AWWA C504/ASME B16.1), with bolt holes in lugs aligning with pipeline flanges. Enables installation between flanges without full disassembly and allows unilateral maintenance.
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Actuation
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Manual gear operation (standard), reducing torque by 30~50% for easy handling of large-diameter valves. Optional pneumatic or electric actuators (ISO 5211 mounting) for automated control in industrial systems.
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Performance Metrics
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– Leakage Class: ANSI/FCI Class V (zero leakage under test pressure), critical for hazardous or valuable media.
– Hydrostatic Test: Body tested at 1.5×rated pressure (e.g., 3.75MPa for Class 150) for 30 minutes.
– Seal Test: Zero leakage verified with air/nitrogen at 1.1×rated pressure (e.g., 2.75MPa for Class 150).
– Cycle Life: ≥100,000 operations with K400 disc maintaining integrity in abrasive media.
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