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ASCO™ 398 3-Way Air-Operated Piston Valve
The ASCO Series 398 line, also known as 8398, of pressure-operated process valves is designed for severe and challenging environments across a broad range of industries.
The high flow-rate valves are engineered for long service lives and are highly resistant to thermal shock and corrosive environments. They are suitable for applications in the medical and life science, oil and gas, power, automotive and tire manufacturing, chemical, water and wastewater, food and beverage, and packaging industries.
ASCO™ 398 3-Way Air-Operated Piston Valve


Body Material
Stainless Steel
Air, Inert Gas, Hot Water, Light Oil, Water, Steam
Pipe / Port Size
1/2 "; 3/4 "; 1 "; 1 1/4 "; 1 1/2 "; 2 "
3 way - 3/2 Normally Closed, 3 way - 3/2 Normally Open


  • Compact actuator for small, space-saving applications
  • Stainless steel construction withstands corrosive environments
  • Autoclavable operation
  • Large range of options