Resilient Seated Butterfly Valves


NS Series Butterfly Valves | NSF 61 & 372 Rated

NSF 61 & 372 certified and Dead-End Service, Manual and Automated Butterfly Valves, 
Lug or Wafer body, ANSI 125/150 flanges (NS, NSP)

A-T Controls’ NS series butterfly valves are certified to meet the requirements of NSF 61 (Drinking Water System Components- Health Affects) and NSF 372 (Drinking Water System Components- Lead Content). This means that NS Series valves are certified for use (by Underwriters Laboratory) in water treatment, water purification, potable water, and water distribution systems and conforms with North American lead content requirements for “lead-free” plumbing.

  • Bi-directional, bubble tight shutoff for full pressure differential
  • Vulcanized Molded rubber seat design
  • ASTM A395 DI & A351 CF8M body materials
  • Multiple seat and disc materials available
  • Square stems and ISO 5211 mounting pad for direct mounting

These valves hold CRNs (Canadian Registration Numbers). Use the search bar on our site to access the CRN certificates; search "CRN".


OC/OS Series: A-T Resilient Seated Butterfly Valves

A-T Controls Butterfly Valves cover a wide range of industries from General Purpose to Chemical, Food and Beverage, Pulp and Paper, Waste Water applications and more. The product line features many choices of seat, disc and stem materials which enable you to address a wide variety of applications and media. A-T Controls Butterfly Valves are designed to comply with MSS-SP-67 and API-609 and are tested to comply with API-598 standards. They are compatible with ANSI 125/150 flanges. These valves hold CRNs (Canadian Registration Numbers). Use the search bar on our site to access the CRN certificates; search "CRN".

  • OS & OSB Series 
    Square stem, Sizes up to 12"
    Body material is Ductile Iron (OSB) or Stainless Steel (OS) 
  • OC & OCB Series 
    DD stem, Sizes 14-24" | Keyed Stem, Sizes 30-48"
    Body material is Ductile Iron (OCB) or Stainless Steel (OC)

Trim Options

  • Body  Wafer or Lug style, ductile iron or stainless steel
  • Disc  Nickle Plated Ductile Iron, 316 Stainless Steel (polished option), Aluminum Bronze, Nylon Coated Ductile Iron, Undercut 316 SST (polished option), Undercut Aluminum Bronze, and others may be available on request
  • Seat  EPDM, Buna-N, Food grade EPDM, High temp EPDM, Viton®, PTFE 
  • Stem  420 SST standard (431 SST, 17-4PH and others available)
  • Stem Bushing  PTFE (Lubricated Bronze available)
  • Stem Seal  Buna (Viton® available)

AS Series: PFA Lined Split Body Butterfly Valve

AS Series butterfly valves are PFA lined (encapsulated) for superior corrosion resistance against severe chemicals and corrosive services.

  • Bi-directional, bubble tight shut-off
  • Rated to 150 psi
  • Standard 17-4PH® stem
  • Live-loaded packing
  • Blow out proof stem
  • 2-piece wafer of lug bodies are epoxy coated
  • Resilient back up liner
  • Multiple safety seals
  • Operating Temp: 20°F to 335°F
  • Sizes 2-12" (CF for 14-24")

These valves hold CRNs (Canadian Registration Numbers). Use the search bar on our site to access the CRN certificates; search "CRN".


Butterfly Valve Tee Assembly

A-T Controls’ Butterfly Valve Tee Assemblies provide a cost-effective, alternative to a 3-way valve solution. Available for lug style butterfly valves, these unique tee assemblies can be customized to fit your application. Consult factory for valve selction and assembly options.

  • Sizes 2" - 36"
  • Lug style Ductile Iron body
  • Various seat options for special applications