Product - DRE

​​​​​​​​​​​​High Pressure Bypass Valves

The DRE is a steam conditioning valve for steam throttling with very high pressure drop combined with in-body desuperheating through spraywater injection. Its primary application is on high pressure bypass systems for fossil-fired power plants with subcritical as well as supercritical steam conditions. With the range of available body materials, the DRE valve can operate to the wide variety of steam pressures and temperatures preferred by today’s most advanced thermal power plants.  

Key features

The valve is specifically designed for the cyclic operation of bypass systems. Equipped with a hydraulic actuator and the necessary safety control devices the valve can be used as a combined HP-Bypass and the superheater safety valve according to TRD 421. The complete system has a type approval (Bauteilkennzeichen) for this application.

  • Ported cone spindle
  • Multi-function contoured cage
  • Optimised arrangement of spraywater nozzles
  • Compact, robust design
  • Cylindrical valve body design
  • Integrated desuperheating
  • Very short necessary straight pipe length after the valve (approx. 1m)
  • Wing spindle and spherical valve body design still available for upgrades or aftermarket


  • Compact, robust design
    • Reduced number of components
    • Easy to maintain
  • Integrated desuperheating allows for:
    • Water injection in area of highest turbulence
    • Optimal mixing of steam and water
    • Optimised body shape for minimal thermal stress
  • Noise level reductions of 10dBA over conventional plug designs
  • Very short evaporation length and an even temperature distribution at the valve outlet
  • Multi-function contoured cage
    • Breaks steam into smaller jets, ensuring noise attenuation
    • Prevents water droplets reaching boundary walls, eliminating thermal shocks
    • Even distribution of the steam across the cage to have an even desuperheating​
  • Wide installed base
  • Bonnet and bolting in the low 
    pressure side
  • No post weld heat treatment 
    necessary for the seat in the field

Product specification

Body Style 
Angle type valve, cylindrical type valve body, flow-to-open​

Nozzle Connection 
For steam pipes: butt-welding, according to customer’s requirement
For spray water pipes: flanged connection with butt-welding to pipe.

Steam data
Temperature range: Up to 650ºC
Inlet pressure: Up to 330 bar​

Trim design
Unbalanced ported cone type

Seat leakage class
EN 12266-1 Cl. B or MSS-SP61 or ANSI/FCI 70.2 Cl. V.

Double acting hydraulic actuator

Replaceable stem/plug, replacable stellited tight seat, replaceable multi-function cage, replacable spray-nozzle body, bolted bonnet with spray nozzle

Outlet throttling orifice, transition pieces for large pipe diameters and material compatibility, prewarming connections available on request

No restrictions to the valve operating position (for serviceability, actuator mounted on the top is recommended)
Safety valve certificate: EN4126-5 (TRD 421) - Type approval availableCertified according to: PED97/23/EC & modules H & H1
Design code
EN 12516-2, others upon request.

Valve breakdown​

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Product - DRE