Critical Technical Advantages
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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.
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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.
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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.
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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.
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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.
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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.
Technical Performance Matrix
| Feature | Details |
| Valve Style | Globe (Single Port) |
| Plug Action | Unbalanced (Push-down-to-close) |
| Guiding | Heavy-Duty Drilled-Hole Cage Guided |
| Pressure Class | Up to CL2500 and Intermediate Special Ratings |
| Shutoff Class | Up to Class V or VI |
| Maintenance | Top-entry Quick Change Trim |
Primary Applications
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High-Pressure Drains and Vents: Reliable isolation and throttling for boiler and turbine support systems in power plants.
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Severe Service Steam: Managing high-pressure steam headers where vibration resistance and shutoff are paramount.
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Hazardous Chemical Feed: Precise control of high-pressure reactants where safety-critical shutoff is required.
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Hydrocarbon Production: Handling high-pressure gas and liquid streams in upstream and refining facilities.
