المزايا التقنية الحاسمة
-
Maximum Shutoff Reliability: Because the EHS is an unbalanced valve, it does not rely on internal piston rings or O-rings for balance. This removes a common internal leak path and allows the full thrust of the actuator to be applied directly to the seat, achieving tight Class V or VI shutoff in high-pressure isolation services.
-
High Capacity Design: Incorporating advanced aerodynamic and hydrodynamic flow-stream contouring, the EHS provides 30% to 40% higher capacity than conventional globe valves with comparable port sizes. This allows for more efficient flow handling and can often lead to more economical valve sizing.
-
Rugged Drilled-Hole Cage Guiding: Standard drilled-hole cages provide exceptional mechanical strength and resistance to vibration. By providing continuous guiding for the valve plug throughout its travel, the cage reduces mechanical noise and prevents the vibration-induced wear that often occurs in high-pressure drop environments.
-
Intermediate Pressure Ratings: For systems operating beyond standard Class 2500 limits, EHS valves with buttwelding ends carry Intermediate Standard Ratings. With non-destructive testing, these valves can conform to ASME Intermediate Special Ratings, providing a safer pressure boundary for modern high-energy utility cycles.
-
Exceptional Stem Sealing: The EHS is designed for use with HIGH-SEAL live-loaded packing systems. Utilizing graphite packing and heavy-duty Belleville springs, this system provides a constant sealing force to prevent the emission of hazardous fluids and minimize the need for manual packing adjustments.
-
Control of Low Flow Rates: For high-pressure applications requiring very low flow regulation, the EHS can be fitted with Micro-Form or Micro-Flute valve plugs. These offer superb rangeability and protect the trim from the erosive “wiredrawing” effects associated with throttling near the seat.
مصفوفة الأداء الفني
| ميزة | تفاصيل |
| نوع الصمام | جلوب (منفذ واحد) |
| آلية التوصيل | Unbalanced (Push-down-to-close) |
| التوجيه | Heavy-Duty Drilled-Hole Cage Guided |
| فئة الضغط | حتى تصنيف CL2500 والتصنيفات الخاصة المتوسطة |
| فئة الإيقاف | حتى الصف الخامس أو السادس |
| صيانة | Top-entry Quick Change Trim |
التطبيقات الأساسية
-
High-Pressure Drains and Vents: Reliable isolation and throttling for boiler and turbine support systems in power plants.
-
Severe Service Steam: Managing high-pressure steam headers where vibration resistance and shutoff are paramount.
-
Hazardous Chemical Feed: Precise control of high-pressure reactants where safety-critical shutoff is required.
-
Hydrocarbon Production: Handling high-pressure gas and liquid streams in upstream and refining facilities.
