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DRE
High Pressure (HP) bypass valves for controlled safety pressure relief systems (CSPRS)
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.
- 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.
Product Specifications
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 ASM-E
Serviceability
- Replaceable spindle, service friendly seat configurations, replaceable multi-function cage, replaceable 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: EN 4126-5 (TRD 421) – Type approval available
- Certified acc. to: PED97/23/EC & modules H & H1
Design code
- EN 12516-2, others upon request
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