Fail safe operating reliability
Design simplicity
Tight shut-off
Low pressure drop
Ability to open against differential pressure
One piece forged stem
Atwood & Morrill® 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 thoughout the nuclear fleet worldwide. The durability and reliability has been proven in service and through rigorous qualification testing.
Fail safe operating reliability
Design simplicity
Tight shut-off
Low pressure drop
Ability to open against differential pressure
One piece forged stem
Main Steam lines in BWR and PWR Power Stations
ASME B16.34, ASME Sec III
ASME 600 to 1500
14″” to 34″” (350 mm – 850 mm)
up to 1200ºF
Carbon steel or alloy steel
Poppet stabilization
Preventive Maintenance