KEYSTONE RMI DUBEX BUTTERFLY VALVE AWWA FACE-TO-FACE
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- Randolf Singleton
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1 The Dubex is a double flanged, triple eccentric resilient seated valve design for services in the water industry FEATURES GENERAL APPLICATION Drinking water pump station and transportation/distribution. Waste water effluent and treatment plants. Reservoirs, circulating water systems. Desalination plants. Cooling water systems (power plants, general industry). CERTIFICATION Standard NSF 61. AWWA POD (Proof Of Design) certificates available. TESTING Performance testing in compliance with AWWA C504 requirements. Valves are cycle tested as per AWWA C504 requirements. TECHNICAL DATA Pressure: 6" to 66" 350 psi up to 84" 250 psi up to 120" 150 psi above 120" contact factory Temperature: F Flange accommodation: as per AWWA C504 flat face (raised face optional) Drilling: 6" to 72" ASME B16.1 above 72" AWWA C207, class D Other drillings on request Face-to-face: According AWWA C short. Above 72": according AWWA C Alternative face-to-face dimensions on request Triple eccentric design: - 1st offset: center line of the resilient disc seal is offset from the center line of the shafts. - 2nd offset: the center line of the shaft is offset from the valve body. - 3rd offset: the Dubex body seat landing surface has the shape of an oblique cone with the ground surface perpendicular to one side of the cone. Resilient seal firmly integrated on disc for tight shut off performance. In-line replaceable and readjustable resilient disc seal. Standard body seating surface is Stainless Steel. Alternative seating surfaces on request. Horizontal or vertical shaft mounting. Axial bottom shaft bearing carrying the disc weight when installed with shaft in vertical position. Reversed V-shaped packing for vacuum applications. Open brackets for packing access and adjustments are available on request. Self lubricating bearings. Low head loss, suitable for throttling services. Clockwise closing. Suitable for manual gear, electric, hydraulic and pneumatic actuation. Design to comply with AWWA: - Higher grade shaft material comply to shaft safety requirements of AWWA. - Minimum shaft diameter deviates from AWWA Emerson. All rights reserved. VCTDS US 14/02
2 SPECIFIC ADVANTAGES OF THE TRIPLE ECCENTRIC DESIGN - Torque closing: greater torque results in improved tightness. - Closing torque is in direct relation with the shut off pressure, which results in smaller actuator selections at lower pressures. - Virtually no rubbing from the resilient seal on the seating surface. This enhances the life expectancy of the valve. - Large diameter valves are normally in open position. Sediments can therefore settle on the body seating surface. Due to the specific geometry these sediments will be whiped off during closing, improving sealing performance. - The resilient disc seal is adjustable, facilitating easy maintenance. - The resilient disc seal is replaceable in line. Clearance between disc seal and body seat No rubbing between disc seal and body seat 3rd eccentricity point of rotation seal 2nd eccentricity 1st eccentricity Valve shown with epoxy resin internal lining (Epasfill) 120" valve shown 2
3 SPECIFIC ADVANTAGES OF THE TRIPLE ECCENTRIC DESIGN Retaining seal Body Body seat ring seal Standard configuration, stainless steel seat and retaining ring Body internal surface : two pack epoxy paint Body seat ring : stainless steel seal retaining ring : stainless steel : ductile iron, two pack epoxy paint Lined configuration, stainless steel retaining ring Body internal surface : rubber lined Body seat : ductile iron, rubber lined seal retaining ring : stainless steel : ductile iron, rubber lined Full lined configuration Body internal surface : rubber lined Body seat : ductile iron, rubber lined seal retaining ring : ductile iron, rubber lined : ductile iron, rubber lined Optional configuration Body internal surface : two pack epoxy paint Body seat : ductile iron, epoxy resin lined seal retaining ring : ductile iron, two pack epoxy paint : ductile iron, two pack epoxy paint Optional configuration, metal to metal Body internal surface : two pack epoxy paint Body seat : stainless steel seat retaining ring : NiAlBr : ductile iron, two pack epoxy paint Notes Coating: Dry layer thickness of 6 Mill, NSF 61 approved Rubber lining: Natural rubber (Ebonite), with standard thickness of 1/8", and a Shore D hardness of 75. Other linings available on request Other configurations available on request. 3
4 Standard shaft seal Optional: adjustable stuffing box Lens shape up to 86 Flow through shape disc from 88 VALVE DIMENSIONS Valve Laying length D Weight øa C H H1 (NPS) (DN) (NPS) (DN) (lbs) (kilos) (NPS) (DN) (NPS) (DN) (NPS) (DN) (NPS) (DN) LL* ¾ ⅜ ⅞ ½ ⅜ ⅞ ⅜ ⅘ ⅜ ¾ ¾ ⅜ ¾ ⅞ ⅜ ¾ ¼ ⅜ ⅝ ⅞ ⅜ ⅝ ⅜ ⅜ ½ ½ 1,131 4 ⅜ ⅖ ⅞ 1,266 4 ⅜ ⅜ ,488 7 ⅞ ¼ ,725 8 ⅞ ⅛ ¼ 1,835 8 ⅞ ⅕ 2,164 8 ⅞ ⅞ 2,259 8 ⅞ ⅞ ½ 2,554 8 ⅞ 225 LL** ¾ ⅝ ½ ½ ⅜ ¼ ⅛ ⅛ 3000 LL* = Laying length AWWA C504 short LL** = Laying length AWWA C516 4
5 C v VALUES Opening angle (deg) NPS NOTES 1. Listed data are valid for 150 psi rated valve only. 2. Rated C v = volume of water in USG/min at 60 F that will pass through valve at a given valve opening at a pressure drop of 1 psi. 3. Values may change without notice. 4. C v -values are based on best data available however no responsibility is assumed for inaccuracies. 5. Allowable flow velocity 72 : 10 Ft/s; 80 : 8 Ft/s. For higher velocity, please contact factory. In our factory R&D facilities all our large diameter Dubex valves are modeled and optimized for specific flow conditions with infinite ANSYS technologies. Latest computer software is also applied to design the castings and to produce the valves with greatest care and efficiency. Simulation of disc deflection under pressure Example of casting weight calculation 5
6 MATERIAL SELECTION Body Body seat Shaft Seal Retaining ring Trim No. Ductile iron Ductile iron Stainless Steel 316 Stainless Steel 431 EPDM Stainless Steel Ductile iron Ductile iron Ductile Iron (Epasfill) Stainless Steel 431 EPDM Stainless Steel Ductile iron Ductile iron Stainless Steel 316 Stainless Steel 431 EPDM Ductile iron 452 Ductile iron Ductile iron Ductile Iron (Epasfill) Stainless Steel 431 EPDM Ductile iron 453 Ductile iron RL Ductile iron RL Ductile iron RL Stainless Steel 431 EPDM Stainless Steel Ductile iron RL Ductile iron RL Ductile iron RL Stainless Steel 431 EPDM Ductile iron RL 461 Ductile iron RL Ductile iron RL Ductile iron RL Duplex SS EPDM Stainless Steel Ductile iron RL Ductile iron RL Ductile iron RL Duplex SS EPDM Ductile iron RL 464 NOTES 1. Trims 450, 451, 452, 453: body internal and external and disc: coated with two-part Epoxy coating. Min. dft. 6 Mill (150 mu). Color Red Brown. 2. Trims 460, 461, 457, 464: body external: coated with two-part Epoxy coating. Min. dft. 6 Mill (150mu). Color Red Brown. Body internal, body seat area and disc: natural rubber lined (Ebonite). Hardness 75 Shore, layer thickness 1/8. 3. Ductile Iron RL body is always dry body design. 4. Trims always have a dry shaft (rubberized shaft). 5. In all trims: pin material is same as shaft material. 6. Contact factory for other materials, configurations and options. MATERIAL SPECIFICATION Partname Material Material number Remark Body Ductile Iron A 536 Gr Ductile Iron A 536 Gr Retaining ring Stainless steel Grade 316 Ductile iron A 536 Gr Other available materials for body, disc and retaining ring like A 395 Gr , ASTM A 216 WCB, ASTM A 352 LCB, BS 2789 gr , ASTM A 352 LCB, ASTM A 351-CF8M etc. Seal EPDM Temperature range 0 F to +220 F (-18 to C) NBR Temperature range 15 F to +180 F (-10 to + 80 C) Shaft Stainless steel ASTM A Alternatives: Grade 316 and Duplex Bearings Self lubricating PTFE-lined Bronze bearings alternatively Body-seat Stainless steel Grade 316 Alternative: Epasfill lined ductile iron, rubber lined pin Stainless steel ASTM A F Alternative: Duplex Seal cover Stainless steel Grade 316 Bottom cover Ductile Iron A 536 Gr Axial positioning ring Stainless steel Grade 316 O-rings and seal NBR-rubber Internal screws Stainless steel Grade 316 Axial bearings Glass cloth reinforced PTFE Adjustable stuffing box Bracket Ductile iron A 536 Gr Gland Ductile iron A 536 Gr Packing Braided TFE Hamar TP 6
7 PARTS LIST Part name Part name Part name 1 Body 9 Axial positioning ring 17 Screws bottom shaft 2 10 Body seat 1) 18 Screws bottom cover 3 Retaining-ring 11 pin 19 Screws seal 2) 4 Seal 12 Seal cover 20 Axial bearing 5 Top shaft 13 Shaft seal 6 Bottom shaft 14 O-ring 7 Bearings 15 Screws body seat 8 Bottom cover 16 Screws retaining ring NOTES 1) 6 to 14 are equipped with a body-seat sleeve instead of body-seat ring. 2) 6 to 8 have a circlip instead of screws. 3) Pictured is valve size 18. 4) For AWWA configured valve an adjustable stuffing box is available. Pressure rating Bi-directional, tight shut off performance 350 psi (25 bar) Maximum pressure 250 psi (16 bar) 150 psi (10 bar) 6 DN 150 Valve size 66 DN DN DN
8 AVAILABLE TECHNICAL OPTIONS 1. Dry shaft option Alternative to high corrosion resistance shaft materials the Dubex valve can be equipped with the optional dry shaft provision. In that case the standard shaft material is protected from the medium by applying rubber lining. This lining protects the standard shaft material against corrosive environments. 2. Combined Butterfly Check Valve (CBCV) Example of 72 combined butterfly check valve for a power station cooling water system Computer simulation of CBCV This unique and proven configuration combines the advantages of the tight shut off butterfly valve with the non slamming action of high end butterfly valves. Such design is a cost effective alternative to existing pump protection solutions such as traditional swing type check valves, and large and complex cone type valve. Specific advantages of the combined butterfly check valve design: - Power failure to close - Very short closing times - Simple, reliable quarter turn operation eliminating the use of multi turn gears on sensitive electrical equipment - Controlled closing times in order to avoid water hammer - Quick opening times - Non slamming design 3. Fabricated design For specific applications, such as vacuum service and buried service steel pipe lines, we do produce the fabricated Dubex valve design. It incorporates all advantages of the triple eccentric resilient seated butterfly valves with the features of a butt weld valve having identical wall thicknesses between pipe and valve. Having equivalent materials ensures proper welding and avoids cracking due to different material expansions coefficients. - Bi-directional tight shut off service - Available with add on power packs, control panels and cabinets - In line adjustable seat - In line maintenance - Non rubbing soft seat, enhancing the life time expectation - Fully lined versions available for corrosive services - Custom made 24 Butt weld Dubex valves in production 2017 Emerson. All rights reserved. 8
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