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Manual and Actuated Resilient Seated Butterfly Valves



The ST Series are resilient seated 125/150, ductile iron wafer style (STW) or lug style (STL) butterfly valves available with either BUNA-N or EPDM seats and a choice of disc materials (316SS, nickle plated ductile iron, or bronze). It can be equipped with a manual handle or with pneumatic or electric actuators. A full range of accessory items are available including limit switches, solenoid valves, positioners and manual override devices.


Lug & Wafer Style Mounting

Buy a Resilient Seated Butterfly Valve

Features & Benefits

  • Silicone Free
  • Economy & high performance
  • One-piece body construction and self-centering disc.
  • Seat facing acts as flange gasket.
  • 3 shaft bushings support actuation.
  • Shaft sealing against external leakage
  • Meets MSS SP-67 and API-609 specs.
  • Complete line of accessories


  • Body: Epoxy Coated Ductile Iron
  • Disc: 316 Stainless Steel (standard) NI Plated D.I. or Bronze available
  • Seats - BUNA-N or EPDM
End Connections
  • Wafer: 2" to 12"
  • Lugged: 2" to 24"
Temperature Range:
  • BUNA-N: -4 to 194°F
  • EPDM: -22 to 230°F
Pressure Range:
  • 225 PSIG (2" to 12")
  • 160 PSIG (14" to 24")
Pressure Testing:
  • Body Hydro: 343 PSIG
  • Seat Hydro:243 PSIG
Dead End Service: (lug type only)
  • 150 PSIG (2" to 12")
  • 100 PSIG (14" to 24")

Available Actuators

  • Electric
  • Pneumatic (spring return)
  • Pneumatic (double acting)
  • Manual Handle Lever
  • Manual Geared Hand Wheel
  • Geared Hand Wheel with Chain Wheel
  • Manual Handle with Limit Switch

Typical Applications

  • Water and waste effluent treatment plants
  • Paper, textiles and sugar industry
  • Construction industry, and drilling production
  • Heating, air conditioning, and cooling water circulation
  • Pneumatic conveyors, and vacuum applications
  • Compressed air, gas and desulphurization plants
  • Brewing, distilling, and chemical process industry
  • Transportation and dry bulk handling
  • Power industry
  • Custom Butterfly Valve Assemblies

Certifications & Approvals

  • Meets MSS SP-67 and API-609 Certifications
  • ISO 9001 by LRQA. certificate No.K981064
  • Canada registration No CRN 0C0569.9C valves
  • CE/PED approval... by LLOYDS certification No RPS0160308/01
  • Products approval...South Africa SABS, No.7222/145532/VH136

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