CCI Valve Technology AB

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)