Butt weld metal seated butterfly valve
The Butt Weld Metal Seated Butterfly Valve is engineered to provide superior performance in demanding industrial applications. Its butt-weld connection delivers a leak-proof and secure integration into pipelines, while the metal-seated design ensures durability in high-pressure and high-temperature environments. This valve is widely used in applications requiring exceptional reliability, such as petrochemical plants, power generation facilities, and metallurgical processes.
Category：Hard seal butterfly valve
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Product Overview
This Butt Weld Metal Seated Butterfly Valve (Standard Model: D363H) is an industrial valve specially designed for high pressure harsh working conditions, with butt weld integrated connection as the core and 3D triple offset metal-to-metal seat as the sealing main body. Both ends of the valve body are prefabricated with standard welding bevels, which can be directly butt welded with the same material pipeline to form a breakpoint-free integrated connection, completely solving the hidden dangers of gasket leakage and bolt loosening of flanged/wafer type valves. Equipped with high-performance metal seal pair, it has the core advantages of high temperature and erosion resistance, bidirectional zero leakage, pipeline stress resistance and long-term maintenance-free operation.
Key Features
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Core Butt Weld Connection Structure, Integrated Zero Leakage & High Pressure Adaptation
Fully focused on the core design of butt weld connection, it solves the external leakage pain points of conventional valves from the root:
- Both ends of the valve body are prefabricated with standard butt weld bevels, in strict accordance with ASME B16.25 and GB/T 12224 weld end standards, with precisely controlled bevel angle and root face size, suitable for on-site all-position welding. After direct butt welding with the same material pipeline, it forms an integrated pipeline, completely eliminating the hidden dangers of external leakage such as gasket aging, bolt loosening and end face leakage of flanged connections, especially suitable for buried, subsea, high pressure, flammable and explosive medium working conditions;
- The valve body adopts one-piece high-strength precision casting/forging process with uniform wall thickness, designed with equal strength to the pipeline, with strong resistance to pipeline stress, vibration and temperature alternation, perfectly suitable for long-distance transmission pipelines and frequent start-stop working conditions;
- The weld end material is completely consistent with the valve body and pipeline base material, ensuring welding fusion, avoiding dissimilar steel welding defects, with mature on-site welding technology and convenient construction, realizing maintenance-free connection for the whole life cycle after welding.
- Both ends of the valve body are prefabricated with standard butt weld bevels, in strict accordance with ASME B16.25 and GB/T 12224 weld end standards, with precisely controlled bevel angle and root face size, suitable for on-site all-position welding. After direct butt welding with the same material pipeline, it forms an integrated pipeline, completely eliminating the hidden dangers of external leakage such as gasket aging, bolt loosening and end face leakage of flanged connections, especially suitable for buried, subsea, high pressure, flammable and explosive medium working conditions;
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High Performance Metal Seat Seal Pair, Bidirectional Zero Leakage & Harsh Condition Resistance
Adopting triple offset metal-to-metal seal structure, the sealing surface of the seat and disc adopts plasma spray welding Stellite hard alloy, supersonic spraying tungsten carbide process, with surface hardness up to HRC40-65, excellent high temperature resistance, erosion resistance, particle wear resistance and anti-seizure performance, suitable for wide temperature range from -40℃ to 650℃, with service life more than 8 times that of ordinary soft seal butterfly valves. The elastic metal seat adopts bidirectional self-energized sealing design, which can realize full pressure grade sealing in both forward and reverse directions, with sealing grade up to ANSI/FCI 70-2 Class V zero leakage. The higher the medium pressure, the tighter the seal fit, which can automatically compensate for thermal expansion and contraction, avoiding high temperature jamming and seal failure.
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Triple Offset Friction-Free Opening & Closing Structure, Low Torque & Long Service Life
Optimized 3D triple offset design (shaft eccentricity, disc eccentricity, sealing cone eccentricity) ensures the metal seat and disc sealing surface only contact at the moment of full closing, and completely separate after opening, no sliding friction during the whole stroke. It completely avoids wear of the sealing surface caused by frequent opening and closing, with operating torque over 60% lower than ordinary concentric butterfly valves, and cycle life more than 10,000 times, greatly reducing the actuator specification, perfectly suitable for frequent operation and long-term continuous operation conditions.
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Full Working Condition Material Adaptation & Complete Safety Protection
Core parts such as valve body, disc, stem and weld end provide a full range of industrial material options: WCB carbon steel, A105 forged steel, 304/316 stainless steel, duplex steel, WC6/WC9 Cr-Mo steel, etc., perfectly matching various pipeline materials and medium working conditions, with excellent acid, alkali and chloride corrosion resistance, high temperature creep resistance. Standard anti-static device, blow-out proof stem, high temperature flexible graphite packing seal, optional API 607 fire-safe structure, which can still maintain effective sealing under fire conditions, fully eliminating potential safety hazards, suitable for flammable and explosive high-risk medium working conditions.
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Full Drive Mode Compatibility, Suitable for Automatic Control
Reserved ISO 5211 standard mounting pad for direct connection with worm gear drive mechanism, pneumatic/electric actuators, suitable for local manual operation and PLC/DCS remote automatic control. Manual/worm gear drive is optional for DN50-DN100, worm gear mechanism is standard for DN125 and above, suitable for labor-saving operation of high pressure and large diameter working conditions.
Applications
Oil & Gas Industry: Crude oil/natural gas long-distance pipelines, gathering and transportation pipe networks, high pressure gas main lines, oilfield wellhead process pipelines, subsea oil and gas pipelines;
Power Industry: Power plant boiler high temperature and high pressure steam main lines, thermal power plant circulating water systems, flue gas desulfurization and denitrification high temperature pipelines;
Chemical Industry: Coal chemical high pressure process pipelines, petrochemical hydrogenation unit pipelines, fine chemical strong corrosive medium high pressure pipelines;
Municipal Industry: Urban high pressure gas pipe networks, district heating high temperature and high pressure main lines, buried long-distance pipelines;
Other Scenarios: Marine high pressure pipelines, metallurgy high temperature gas pipelines, waste incineration high temperature flue gas main lines.
