Butterfly Valves




Acclaimed as 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 tapped-lug patterns in a wide variety of material choices, DEMCO® butterfly valves feature a one-piece body for minimum weight and maximum strength. The unique stem hole design in the disc ensures a dry stem journal, and the hard-backed seat (2" - 36") allows ease of installation, reliable operation, and is field-replaceable without special tools. DEMCO® butterfly valves are available in sizes 2" thru 36". 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



The high performance WKM® butterfly valve that brings low cost and light weight to high pressure water, oil, steam, gas and slurry applications.

WKM® DynaCentric butterfly valves satisfy a wide range of industrial applications. Available in carbon steel or stainless steel as well as lug and wafer body styles, they may be specified in sizes from 2.5" to 36" in pressure class 150, 2.5" to 24" in pressure class 300 and 3" to 12" in class 600. Engineered for heavy duty, maintenance-free performance in a variety of uses, the WKMÒ DynaCentric High Performance butterfly valve is most commonly selected for the following applications:

  • Chemical and petrochemical processing
  • Utilities
  • Pulp and paper
  • Oil and gas production
  • Fuel handling systems
  • Air conditioning and refrigeration
  • Marine

The DynaCentric butterfly valve offers the high performance of ball and gate valves with the low-cost, light-weight benefits of a butterfly valve design. It is ideal for handling water, oil, steam, gas and slurries.



Main features

  • Size: 3” through 120”
  • Class: 150 through 600
  • Design: Flanged, Lug, Wafer & Butt-weld
  • Triple Offset Design for Bi-directional Bubble Tight Shutoff
  • Self Centering Disc
  • Sealed Bearing Design
  • Stellite Body Seat Standard
  • Blowout Proof Stem Option
  • Firesafe Tested to API 607 Revision 5
  • Available in a Wide Range of Materials and Configurations
  • WCB
  • 316 Stainless Steel
  • Monel
  • Hastelloy
  • Nickel - Aluminum - Bronze
  • Duplex

Superior Features come Together for Superior Service

Featuring the premium Triple Offset design, the Newmans TOV is a zero leakage valve in both directions utilizing a Stellite/316 SS metal seating surface carefully matched to provide superior sealing.

The Triple Offset design uses three separate geometries of disc/stem orientation and rotation to accomplish bubble tight sealing.

The proven conical seating feature allows Newmans Triple Offset Valve to operate with minimal torque, increased temperatures and longer life cycle. The disc and body seat engage with no rubbing of the seating components.