Hard seal butterfly valve

Product Overview

Core Structure

All Metal Sealing System

The seat, disc sealing surface and compensation structure are all made of metal. The sealing surface is overlaid with Stellite hard alloy or sprayed with tungsten carbide, with hardness up to HRC40-65, excellent wear and erosion resistance. The integrated elastic metal seat realizes bidirectional self-energized sealing, automatically compensates for thermal expansion and contraction, with sealing grade up to ANSI/FCI 70-2 Class V zero leakage.

Triple Offset Friction-Free Operation Structure

3D design of shaft eccentricity, disc eccentricity and cone angle eccentricity ensures no sliding friction of the sealing surface during the whole opening and closing stroke, only fitting at the moment of full closing, completely eliminating the hidden danger of metal surface wear. The cycle life is more than 10,000 times, and the operating torque is more than 60% lower than that of ordinary butterfly valves.

Integrated Safety Pressure Bearing Structure

One-piece high-strength valve body with optional wafer/flanged/butt weld connection; bottom-mounted blow-out proof stem with metal-graphite packing seal, no external leakage risk; all-metal anti-static design + API 607 intrinsic fire-safe structure, suitable for high-risk working conditions; reserved ISO 5211 standard mounting pad for direct connection with manual/worm gear/pneumatic/electric actuation.

Main Applications

1. High Temperature & High Pressure Thermal Conditions: Power plant steam pipe networks, thermal power plant heating main lines, coal chemical high temperature syngas pipelines, heat transfer oil systems, suitable for high temperature up to 650℃, no high temperature failure risk of soft seals.
   

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2. Particle-Laden & Severe Erosion Conditions: Metallurgical blast furnace gas pipelines, slurry transportation, flue gas dust removal systems, sand-containing sewage pipelines, high-hardness sealing surface resists particle erosion, no scratch and tear risk of soft seals.
   

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3. Flammable & Explosive High-Risk Conditions: Oil & gas long-distance pipelines, urban high-pressure gas pipe networks, chemical hazardous material transportation pipelines, with intrinsic fire safety, anti-static and zero leakage design, meeting high safety requirements.
   

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4. Strong Corrosive Chemical Conditions: Fine chemical acid and alkali pipelines, seawater desalination systems, electroplating wastewater treatment, optional stainless steel/duplex steel/special alloy materials, no swelling and corrosion risk of non-metal parts.
   

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5. Long-Term Maintenance-Free Conditions: Buried/subsea/high-altitude pipelines, utility tunnel main lines, no wearing parts, realizing more than 3 years of long-term maintenance-free operation.