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One of the most durable of all resilient-seated butterfly valves in the industry, this valve excels in a wide variety of applications.

Cast in both wafer and tappedlug patterns in a wide variety of material choices, DEMCO Butterfly Valves feature a onepiece body of minimum weight and maximum strength.

The unique stem hole design in the disc ensures a dry stem journal and the hard-backed seat allows ease of installation, reliable operation, and is fieldreplaceable without special tools. DEMCO Butterfly Valves are available in size 2 in. through 36 in. (50 mm through 900 mm) Engineered for long-term, maintenance-free performance, DEMCO Butterfly Valves are commonly selected for a variety of applications spanning a wide range of industries:

  • Chemical and petrochemical
  • Agriculture
  • Oil and Gas drilling and production
  • Food and beverage
  • Water and waste water
  • Cooling towers (HVAC)
  • Power
  • Mining and materials
  • Dry bulk handling
  • Marine and government


This valve provides bidirectional sealing at full rated pressure with identical flow from either direction.


Molded into the edge of the seat is an integral flanges seal which accommodates ASME weld neck, slip-on, threaded and socket flanges as well as "stub end" type C flanges.


Body rating is ASME Class 150 (285 psi non-shock). Wafer body diameters are designed to self-center in ASME Class 150 flange patterns.


The wafer style butterfly valve is designed to maintain a seal against bi-directional pressure differential to prevent any backflow in systems designed for unidirectional flow. It accomplishes this with a tightly fitting seal; i.e., gasket, o-ring, precision machined, and a flat valve face on the upstream and downstream sides of the valve.


Sizes 2’’ through 12’’ (50mm through 300mm), this series is a general purpose valve with neck length designed to provide full clearance of the valve top over 2’’ of insulation on ASME Class 150 pipe flanges, available in both Wafer and Lug Styles.


Sizes 2’’ through 12’’ (50mm through 300mm), it is suited for a wide range of applications in many industries, including food and beverage utilities and process flow lines. This short neck design is offered in a wide variety of body materials. The valves are designed for installation between ASME Class 125/150 flanges.


Sizes 2’’ through 12’’ (50mm through 300mm, it is a short neck valve with body notches to fit popular lightweight flange patterns, making it ideal for bulk material handling and the transportation industry. Valves will also center in ASME Class 125/150 flanges.


DEMCO Marine Butterfly Valves meet all the requirments of U.S.C.G. Marine Engineering Regulations as outlined in Title 46, Code of Federal Regulations, Part 56 and American Bureau of Shipping including tagging per MSS-SP-25 and tesing per MSSSP- 67. All valves are shell tested at 1 1/2 times rated working pressure and seat tested at rated working pressure.

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