DeZURIK BOS-US Uninterrupted Seat Resilient-Seated Butterfly Valves

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DeZURIK BOS-US uniterrupted seat resilient-seated butterfly valves are available in 2-inch to 42-inch sizes.

Territory Restriction: DeZURIK/APCO/Hilton and Willamette appointed Lesman as its exclusive industrial representative in 2017. Lesman's DeZURIK territory includes the entire state of Illinois, Eastern Missouri, select counties in Northwest Indiana, and select western counties in Kentucky. DeZURIK customers outside the Lesman territory can find their local representative at

DeZURIK BOS-US butterfly valves come equipped with an uninterrupted seat design, one-piece body, solid one-piece shaft and a high performance resilient seat. The uninterrupted seat design provides bi-directional shutoff to the full rating of the valve.
BOS-US valves are designed for a variety of applications where extended service is necessary, such as high cycles, high pressures, and high temperatures.

  • Available valve sizes 2" to 20". Larger sizes (up to 42") on application
  • Temperature range up to 250°F
  • Pressure ratings for 2" to 20": 250 PSI with ductile iron/nickel plated disc; 200 PSI with 316 stainless steel disc
  • 2" to 20" feature seat bonded to the body; 24" and larger feature a seat bonded to a solid backing ring
  • Compatible with manual gear (handwheel, chainwheel, square nut), lever, PowerRac® double-acting and spring-return cylinder, G-Series cylinder actuators
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