Atwood & Morrill® Main Steam Isolation Valve

Main steam isolation valves are utilized to assure rapid closure and tight shutoff of the main steam lines for primary containment in nuclear power plants. The design is used extensively throughout nuclear fleets worldwide. The durability and reliability have been proven in service and through rigorous qualification testing.

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  • Fail-safe operating reliability
  • Design simplicity
  • Tight shutoff
  • Low pressure drop
  • Ability to open against differential pressure
  • One-piece forged stem

  • ASME B16.34, ASME Sec III

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