Demco Butterfly Valve Series NE-D

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DEMCO® Butterfly Valves Recognized for their quality design and rugged dependability, DEMCO® resilient seated butterfly valves are designed for dependability. DEMCO® in Production: DEMCO® butterfly valves feature a one-piece body for minimum weight and maximum strength. Engineered for long-term, maintenance- free performance, Demco butterfly valves are commonly selected for a variety of applications spanning a wide range of industries. 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 Bi-directional Sealing This valve provides bi-directional sealing at full rated pressure with identical flow from either direction. Integral Flange Seal Molded into the edge of the seat is an integral flange seal which accommodates aSME weld neck, slip-on, threaded and socket flanges as well as “ stub end” type C flanges. ASME Class 150 Rating Body rating is aSME Class 150 ( 285 psi non-shock) . Wafer body diameters are designed to self-center in aSME Class 150 flange patterns Multiple Pressure Ratings Three drop tight pressure ratings are offered for 2 in. to 12 in. ( 50 mm to 300 mm) sizes. The standard shut-off pressure rating is 200 psi, but 285 and 50 psi shut-off ratings are also available and where drop-tight closure is not required and minimal torque is desired, a throttling 0 psi rated valve is available. Both the 50 psi and throttling ratings allow for smaller actuators, which can significantly reduce overall installation cost in automated applications. The 14 in. to 36 in. ( 350 mm to 900 mm) size valves are available in 150 and 50 psi drop-tight shut-off ratings as well as throttling. Dry Stem Journal Eliminates Potential for leakage The DEMCO disc is uniquely designed with a continuous annular raised land around the stem hole and disc edge which presses into the seat flat at every angular position. The resilient seat presses back with a higher specific force than the line pressure, preventing leakage to the stem. In addition, two O-ring ribs are provided in the seat stem bore creating a triple stem seal. In competitive stem seal designs with boot seats, a seal is accomplished by an interference “ squeezing” on the stem or an O-ring in the stem journal. The potential for leakage behind the seat is high for this competitive design. as the disc wipes the seat, elongation of the stem seal area allows leakage to collect behind the seat. This condition is eliminated by DEMCO’ s dry stem journal and hard-backed seat. Hard-backed Cartridge Seat The DEMCO cartridge seat is constructed by permanently bonding a resilient elastomer to a rigid backing ring. In addition to superior sealing integrity, this design; 1) makes valve installation easier because no special precautions are required for disc position. This is especially advantageous when installing valves with fail closed actuators; 2) eliminates high torque and premature failure caused by elastomer distortion as found in other non-rigid seat designs; 3) simplifies seat replacement because it is slip fitted into the body, with no need for special tools. Positively Oriented Disc Proper orientation of the stem/ disc connection is assured by the rectangular drive. In 2 in. through 24 in. ( 50 mm through 600 mm) size valves, the disc is permitted to float on the stem to perfectly center in the valve seat. This design enhances drop-tight sealing and prolongs service life. End-of-line Service lug body valves may be used in end-of-line service, with downstream piping removed. ( Only weld neck or socket flanges can be used for this service) . Since upstream pressure is excluded between the flange and the seat face by the exclusive DEMCO flange seal design, there is no effective force to slide the seat downstream. DEMCO 2 in. through 12 in. ( 50 mm through 300 mm) lug butterfly valves are suitable for liquid service up to 200 psi with downstream piping removed ( 150 psi 14 in. through 36 in. ( 350 mm through 900 mm) ) . lug body valves are recommended for isolation of pumps, control devices or other system components which may need to be removed for repair or replacement. lug valves are also suitable for installation at points from which piping expansion may proceed. Such valves are normally blanked with blind flanges, to protect the exposed seats until new piping is attached. Specifications Sizes 2 in. through 36 in. ( 50 mm through 900 mm) Body type and style designations Long neck NE-C and NF-C: 2 in. through 36 in. ( 50 mm through 900 mm) , wafer / lug, 36 in. ( 900 mm) . Short neck NE-I, and NE-I Sanitary: 2 in. through 12 in. ( 50 mm through 300 mm) wafer / lug. NE-IT Teflon: 2 in. through 10 in. ( 50 mm through 250 mm) wafer / lug. NE-D: 2 in. through 12 in. ( 50 mm through 300 mm) wafer. Marine: 2 in. through 24 in. ( 50 mm through 600 mm) wafer / lug. Pressure rating 2 in. through 12 in. ( 50 mm through 300 mm) : 0 ( Throttling) , 50, 200 and 285 psi. NEI-T: 150 psi 2 in. through 10 in. ( 50 mm through 250 mm) 14 in. through 36 in. ( 350 mm through 900 mm) : 0, 50 and 150 psi. Operating Temperatures -30º F to 300º F ( -34º C to 204º C) depending on seat material selection and application ( see page 34) Standard Material Options Bodies: Iron, steel, stainless steel and bronze Discs: Nickel plated ductile iron, bronze and stainless steel Stems: 416 and 316 stainless steel Seats: Buna-N, EPDM, FKM, Neoprene This versatile valve comes in a variety of styles to suit an even wider range of applications. In addition, a variety of quality accessories are available to further enhance its suitability to the application. Series NE-D Valve Sizes 2 in. through 12 in. ( 50 mm through 300 mm) , 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 Butterfly Valve available in: NE-C Series P/ N. 1215311 Wafer Type. size : 3 inch, 4 inch, 5 inch, 6 inch, 8 inch, 10 inch, 12 inch Ready stock. NE-C Series P/ N. 5114311. Lug Type. Size 3 inch, 4 inch, 6 inch, 8 inch, 10 nch, 12 inch Ready stock. NE-I Series P/ N. 1115311. Wafer Type. Size 3 inch, 4 inch, 5 inch, 6 inch, 8 inch