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
Benefits
| 
|
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.
Actuation
Double acting hydraulic actuator
Serviceability
Replaceable stem/plug, replacable stellited tight seat, replaceable multi-function cage, replacable spray-nozzle body, bolted bonnet with spray nozzle
Options
Outlet throttling orifice, transition pieces for large pipe diameters and material compatibility, prewarming connections available on request
Orientation
No restrictions to the valve operating position (for serviceability, actuator mounted on the top is recommended)
Certification
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
