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VODEX H664HN Extraction Check Valve for steam turbine pipeline protection

Extraction Check Valve for Steam Turbine Pipelines | DN150-900 PN20-100

The Extraction Check Valve is a precision-engineered safety device for steam turbine extraction lines. Supporting PN20-100 and temperatures up to 425°C, this hydraulic-actuated valve offers seamless, vibration-free flow. Fully compliant with ASME B16.5/B16.25 standards, it guarantees rapid closure and long-term durability in demanding industrial environments.

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Technical Specifications

Model

VD-CV-H664HN
Nominal Diameter (DN)

150 ~ 900mm
Nominal Pressure (PN)

20 ~ 100
Applicable Media

Water, Steam, Coal Gas
Applicable Temperature

Soft-seated: ≤ 80°C; Carbon Steel (C): -29°C ~ 425°C
Inspection & Testing Standards

JB/T 9092, GB/T 13927
Dimension & Connection Standards

ASME B16.10, ASME B16.5, ASME B16.25

Discription

Product Overview

 

The Extraction Check Valve is a critical safety component installed in the horizontal steam extraction pipelines leading from turbine medium/low-pressure conduits. Its primary function is to prevent steam backflow in the extraction pipeline, which could lead to turbine overspeed or flooding in the event of an emergency. This valve provides essential protection for turbines, feedwater pumps, and other vital equipment. Designed for high-speed responsiveness, the valve can close instantaneously in under 0.5 seconds during emergency conditions such as power failure, accidents, or reverse medium flow.

Product Features

 

  1. Free-Swinging Valve Disc: The disc is mounted within the valve body via a connecting pin and shaft, allowing it to swing freely under the action of the medium.

  2. Adjustable Disc & Linkage: The installation position of the valve disc and the linkage arm can be freely adjusted for optimal alignment.

  3. Inclined Valve Seat: The valve seat sealing surface is designed at an angle, facilitating automatic disc resetting and ensuring a reliable, tight seal.

  4. Balanced Shaft Structure: An external balance shaft is integrated to stabilize medium flow, effectively reducing disc vibration and operational noise.

  5. Streamlined Valve Body: The internal cavity features a streamlined design to maintain smooth medium flow and prevent turbulence.

  6. External Lever Mechanism: An external transmission lever is equipped to facilitate torque transmission and operational control.

  7. Hydraulic Cylinder Actuation: Driven by an external hydraulic cylinder, the valve ensures rapid, reliable closure to prevent medium backflow during emergencies.

VODEX-H664HN-Material-Specifications-Chart VODEX-H664HN-Technical-Parameters-Data

VODEX-H664HN-Valve-Structural-Schematic

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