重要な技術的利点
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High-Capacity Flow Stream: The EHD utilizes advanced flow-stream contouring based on aerodynamic and hydrodynamic principles. This results in 30% to 40% higher capacity than conventional globe valves of comparable port sizes, allowing for more efficient process handling and potentially smaller valve footprint.
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Balanced Plug for Precise Control: The balanced plug design equalizes process pressure across the trim. This drastically reduces the actuator thrust required to move the valve, enabling smooth, high-resolution throttling even at extreme pressure differentials without the need for oversized actuators.
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Rugged Drilled-Hole Cage Guiding: Standard drilled-hole cages provide superior mechanical strength and resistance to destructive vibrations. The plug is continuously supported throughout its travel, ensuring mechanical integrity and extending the life of the internal components in high-velocity services.
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High-Temperature Shutoff: The EHD can be equipped with metal C-seals or Bore Seals for thermal extremes. These permit Class V shutoff at temperatures up to 593°C (1100°F), ensuring reliable isolation in high-temperature steam and hydrocarbon systems.
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Intermediate Pressure Ratings: For applications exceeding standard limits, EHD valves with buttwelding end connections can conform to ASME Intermediate Special Ratings. This allows for safe operation at pressure/temperature levels that exceed standard Class 2500 ratings.
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Quick-Change Trim: Maintenance is streamlined through a top-entry design. All trim components can be removed and replaced using common tools without taking the valve body out of the pipeline, significantly reducing labor costs and downtime.
技術性能マトリックス
| 特徴 | 詳細 |
| バルブスタイル | グローブ（シングルポート） |
| プラグアクション | バランス型（押し下げて閉じる） |
| ガイド | 頑丈なドリル穴ケージガイド |
| 圧力クラス | CL2500まで、および中間特別定格 |
| 最高温度 | 金属シール使用時、最高593℃（1100°F）まで対応 |
| 遮断クラス | クラスVまたはVIまで |
主な用途
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Main Steam and Feedwater: Managing high-pressure steam distribution and feedwater regulation in utility power plants.
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Severe Service Throttling: Reliable control in any application where high pressure drops would cause vibration or erosion in less robust valves.
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Refining Operations: Handling high-pressure hydrocarbon streams in hydrocracking and separation units.
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Boiler Support Systems: Controlling high-pressure auxiliary steam and bypass lines requiring high capacity and precision.
