Demco valve.pdf

?DEMCO Butterfly Valves D I S T R I B U T E D V A L V E S ?DEMCO D I S T R I B U T E D V A L V E S ?DEMCO TABLE OF CONTENTS DEMCO BUTTERFLY VALVES Features and Benefits 1 Styles and Accessories 3 PRODUCT SPECIFICATIONS How to Order Valves 5 Base Numbers and Weights 8 Component Parts List 9 Dimensional Data (Valves) 11 HOW TO ORDER AND TECHNICAL INFORMATION Handles 17 Worm Gear Operators 18 Stem Extensions and Torque Data 20 General Technical Information 21 Standard Material Data 26 MATERIAL SELECTION GUIDE 27 TRADEMARK INFORMATION 31 CT-DEM-NE/NF/NEI 01/08 NP-5M CT-DEM-NE/NF/NEI 01/08 NP-5M 1 D I S T R I B U T E D V A L V E S ?DEMCO Flatted “double D” upper stem Large flange top for ease of power automation (full line of actuation and accessories offered) Positive stem retention for blowout proof stems MSS SP-25 marking is standard Triple stem seal High flow disc Bronze bearings Positively oriented disc Hard-backed cartridge seat Wafer style shown One-piece body BUTTERFLY VALVES FEATURES AND BENEFITS 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 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 allows ease of installation, reliable operation, and is field-replaceable without special tools. DEMCO butterfly valves are available in sizes 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 a