Mueller Lineseal 350 Butterfly Valve

6″ – 48” Butterfly Valves. (Class 250B) Designed specifically for the waterworks industry, Lineseal® butterfly valves offer the ruggedness and reliability required for buried service and performance. Lower head loss means getting the most from your pumping station dollar. Lower torques mean less costly actuation packages and the maintenance-free design helps keep your budget under control.


  • 350psig (2415kPa/24 barg) maximum working pressure with temperatures to 250°F
  • Meets or exceeds all applicable requirements of ANSI/AWWA C504 Standard Class 250B; NSF 61/372 certified
  • Body – Ductile Iron ASTM A-536 (65-45-12)
  • Available in sizes 6″-48″ (FLxFL) and 6″-36″ (MJxMJ)
  • 17-4 stainless steel shaft
  • Disc – Ductile Iron ASTM A-536 (65-45-12)
  • Nonmetallic bearings prevent galvanic corrosion & provide lower coefficient of friction
  • Chevron “V” type packing is self-adjusting to last the life of the valve

Specs & Brochures