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DRE140CH
High Pressure (HP) bypass valves
The HP-Bypass Valve Type DRE is a steam conditioning valve for steam throttling with very high pressure drop combined with in-body desuperheating through spraywater injection. Its prime areas of application are 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 Type DRE valve can be used for main steam pressures and temperatures of today’s most advanced thermal power plants.
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.
- Unique “wing-type” plug design.
- Multi-function contoured cage.
- Optimised arrangement of spraywater nozzles.
- Compact, robust design.
- Spherical valve body design.
- Integrated desuperheating.
- 1 metre straight pipe length after the valve.
Product Specifications
Body style
- Angle type valve, spherical shaped valve body
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 : ~ 500 – 610 °C
Inlet pressure
- ~ 160 – 300 bar
Stem / plug design
- Unbalanced wing type
Seat / stem tightness
- EN12266-1 cl.B, MSS-SP61 or ANSI/FCI 70.2 cl. V
Actuation
- Double acting hydraulic actuator
Serviceability
- Replaceable spindle, replaceable multi-function cage, replacable spray-nozzle body, bolted bonnet with spray nozzle, service friendly seat configurations
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)
Body style
- Angle type valve, spherical shaped valve body
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 : ~ 500 – 610 °C
Inlet pressure
- ~ 160 – 300 bar
Stem / plug design
- Unbalanced wing type
Seat / stem tightness
- EN12266-1 cl.B, MSS-SP61 or ANSI/FCI 70.2 cl. V
Actuation
- Double acting hydraulic actuator
Serviceability
- Replaceable spindle, replaceable multi-function cage, replacable spray-nozzle body, bolted bonnet with spray nozzle, service friendly seat configurations
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)
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