As one of the most durable resilient-seated butterfly valves in the industry, the Cameron butterfly-style DEMCO valve excels in a variety of applications.
Cast in both wafer and tapped lug patterns in a variety of material choices, butterfly-style DEMCO valves feature a one-piece body for reduced weight and increased strength.
The unique stem hole design in the disc ensures a dry stem journal. The hard-backed seat enables ease of installation, reliable operation, and infield repairability without special tools. Butterfly-style DEMCO valves are available in sizes 2 to 36 in [50 to 900 mm].
Engineered for long-term, reduced-maintenance performance, butterflystyle DEMCO valves are commonly selected for a variety of applications in the following industries:

• chemical and petrochemical
• agriculture
• oil and gas drilling and production
• food and beverage
• water and wastewater
• cooling towers (HVAC)
• power
• mining and materials
• dry bulk handling
• marine and government.

Bidirectional sealing
The butterfly-style DEMCO valve provides bidirectional sealing at full-rated pressure with identical flow from either direction.
Integral flange seal
An integral flange seal molded into the edge of the seat accommodates ASME weld neck, slip-on, threaded, socket, and stub-end type C flanges.
ASME Class 150 rating
With a body rating of American Society of Mechanical Engineers (ASME) Class 150 (285-psi nonshock), the wafer body diameters are designed to self-center in the ASME Class 150 flange pattern.