冶金用バルブ：製錬における6つの選定基準

Metallurgical Valves are critical flow-control components used in steelmaking, non-ferrous metal processing, mineral preparation, smelting furnaces, gas systems, cooling circuits, slurry pipelines, and environmental treatment equipment.

Metallurgical processes often involve high temperatures, high pressures, abrasive particles, corrosive gases, slurry, steam, oxygen, fuel gas, and rapidly changing operating conditions. Reliable valves help regulate fluid flow, pressure, and temperature while protecting furnaces, pipelines, pumps, compressors, and pollution-control systems.

JST Valve provides customized high-temperature, corrosion-resistant, wear-resistant, and automated valve solutions for demanding metallurgy and smelting applications.

Where Are Metallurgical Valves Used?

Metallurgical Valves are installed throughout raw-material preparation, furnace operation, gas treatment, cooling, chemical processing, product handling, and environmental-protection systems.

• Blast furnace, converter, and electric furnace auxiliary systems
• Coke-oven gas, furnace gas, fuel gas, and combustion-air pipelines
• Oxygen, nitrogen, steam, and compressed-air systems
• Cooling-water and heat-recovery circuits
• Slurry, tailings, ash, dust, and residue pipelines
• Acid pickling, alkali cleaning, and chemical-treatment lines
• Flue-gas treatment, desulfurization, and wastewater systems

Why Metallurgical Valve Service Is Challenging

High temperatures can reduce material strength, accelerate oxidation, damage soft seats, and increase thermal expansion. Frequent heating and cooling may also change valve clearances and sealing loads.

Dust, scale, ash, and mineral particles can erode seats, discs, balls, stems, and internal flow passages. Corrosive gases, acids, alkalis, chlorides, and process chemicals may attack both metallic and non-metallic components.

The selected valve must therefore match the complete combination of temperature, pressure, flow velocity, particle content, corrosion risk, operating frequency, leakage requirement, and actuator duty.

6 Selection Factors for Metallurgical Valves

1. Operating and Design Temperature

Specify normal temperature, maximum design temperature, startup conditions, thermal cycling, and possible heat radiation. These values affect body materials, trim, seats, packing, gaskets, coatings, and actuator selection.

2. Pressure and Differential Pressure

Design pressure and shut-off differential pressure influence valve strength, sealing load, operating torque, actuator size, and the ability to open or close during abnormal conditions.

3. Abrasion and Particle Content

Slurry, ash, scale, ore particles, and dust may rapidly damage conventional sealing surfaces. Metal seats, hard-facing, ceramic components, protected stems, or enlarged flow passages may be required.

4. Corrosion Resistance

Process gases, acids, alkalis, chlorides, wastewater, and chemical additives must be evaluated against every wetted component. Stainless steel, duplex steel, nickel alloys, Hastelloy, titanium, high-silicon cast iron, or lined structures may be considered according to the medium.

5. Flow-Control Accuracy

High-temperature control valves should be selected according to flow coefficient, pressure drop, required control range, fluid state, noise, erosion, actuator response, and process stability.

6. Automation and Maintenance

Pneumatic, electric, hydraulic, or electro-hydraulic actuators can support remote operation and emergency shutdown. The complete valve package should also provide practical access for inspection, seat replacement, packing adjustment, and actuator maintenance.

Common Valves for Metallurgy and Smelting

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How Metallurgical Valves Improve Process Stability

Properly selected Metallurgical Valves help maintain stable flow, pressure, and temperature during furnace operation, gas treatment, cooling, slurry transfer, and chemical processing.

In automated smelting systems, Metallurgical Valves must respond accurately to control signals while maintaining reliable sealing under thermal cycling, vibration, abrasive particles, and changing pressure conditions.

JST Valve develops Metallurgical Valves according to the actual medium, operating temperature, differential pressure, particle content, corrosion risk, required control accuracy, and maintenance conditions.

JSTバルブを選ぶ理由

JST Valve develops Metallurgical Valves for high-temperature gases, steam, cooling water, oxygen, chemicals, corrosive wastewater, slurry, ash, residue, and abrasive particles.

• High-temperature and metal-seated valve designs
• 耐食性および特殊合金材料
• Wear-resistant, hard-faced, and ceramic valve solutions
• 空圧式、電動式、油圧式、および自動式バルブパッケージ
• Customized structures based on actual process conditions

バルブの選定に必要な情報

For an accurate Metallurgical Valve recommendation, please provide:

• プロセス媒体および化学組成
• Particle concentration, size, and hardness
• 動作温度および設計温度
• 使用圧力および最大差圧
• バルブのサイズ、圧力クラス、および接続規格
• Isolation, regulation, or emergency-shutdown function
• Required actuator, operating speed, and fail position

Technical References for Industrial Valves

For additional information about industrial valve testing and metallic butterfly valve requirements, review the following international standards:

• ISO 5208 — Pressure Testing of Metallic Industrial Valves
• ISO 10631 — Metallic Butterfly Valve Requirements

よくある質問

Which valves are suitable for high-temperature metallurgical processes?

Metal-seated control valves, butterfly valves, ball valves, gate valves, and globe valves may be considered. The final selection depends on temperature, pressure, medium, leakage requirement, operating frequency, and thermal cycling.

Which valves are suitable for metallurgical slurry and ash?

Slurry valves, ceramic valves, hard-faced ball valves, knife gate valves, and other wear-resistant structures may be considered according to particle concentration, size, hardness, pressure, and flow velocity.

Can JST Valve provide automated high-temperature control valves?

JST Valve can provide pneumatic, electric, hydraulic, and electro-hydraulic valve packages according to the required control signal, torque, thrust, operating speed, position feedback, and fail-safe function.