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Main Steam Isolation Valve

Atwood & Morrill®

Main Steam Isolation Valve

Main Steam Isolation valves are utilized to assure rapid closure and tight shut off of the main steam lines for primary containment in Nuclear Power plants. The design is used extensively throughout the nuclear fleet worldwide. The durability and reliability has been proven in service and through rigorous qualification testing. (MSIV)

KEY FEATURES & BENEFITS

  • Fail safe operating reliability

  • Design simplicity

  • Tight shut-off

  • Low pressure drop

  • Ability to open against differential pressure

  • One piece forged stem

APPLICATIONS

  • Main Steam lines in BWR and PWR Power Stations

DESIGN STANDARD

  • ASME B16.34, ASME Sec III

PRESSURE CLASS RANGE

  • ASME 600 to 1500

SIZE RANGE

  • 14 - 34 inches (350 - 850 mm)

TEMPERATURE RANGE

  • Up to 1200ºF

  • Up to 649ºC

MATERIALS

  • Carbon steel or alloy steel

UPGRADES & ADAPTATIONS

  • Poppet stabilization

  • Preventive maintenance

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