KEYSTONE RMI DUBEX BUTTERFLY VALVE AWWA FACE … … · KEYSTONE RMI DUBEX BUTTERFLY VALVE AWWA FACE-TO-FACE FEATURES • Triple eccentric design: - 1st offset: center line of the
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• 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.
The Dubex is a double flanged, triple eccentric resilient seated valve design for services in the water industry
CERTIFICATION
• Standard NSF 61.• AWWA POD (Proof Of Design) certificates
available.
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).
VCTDS-00018-US 14/02
TECHNICAL DATA
Pressure: 6" to 66" 350 psi up to 84" 250 psi up to 120" 150 psi above 120" contact factoryTemperature: 0 - 220°FFlange 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 requestFace-to-face: According AWWA C504-10
short. Above 72": according
AWWA C516-10 Alternative face-to-face
dimensions on request
TESTING
• Performance testing in compliance with AWWA C504 requirements.
• Valves are cycle tested as per AWWA C504 requirements.
Valve shown with epoxy resin internal lining (Epasfill)
No rubbing between disc seal and body seat
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.
3rd eccentricity
2nd eccentricity
point of rotation
1st eccentricity
Disc seal
Clearance between disc seal and body seat
120" valve shown
3
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.
Full lined configurationBody external surface : two pack epoxy paintBody internal surface : rubber linedBody seat : ductile iron, rubber linedDisc seal retaining ring : ductile iron, rubber linedDisc : ductile iron, rubber lined
Optional configurationBody external surface : two pack epoxy paintBody internal surface : two pack epoxy paintBody seat : ductile iron, epoxy resin linedDisc seal retaining ring : ductile iron, two pack epoxy paintDisc : ductile iron, two pack epoxy paint
Optional configuration, metal to metalBody external surface : two pack epoxy paintBody internal surface : two pack epoxy paintBody seat : stainless steelDisc seat retaining ring : NiAlBrDisc : ductile iron, two pack epoxy paint
Standard configuration, stainless steel seat and retaining ringBody external surface : two pack epoxy paintBody internal surface : two pack epoxy paintBody seat ring : stainless steelDisc seal retaining ring : stainless steelDisc : ductile iron, two pack epoxy paint
Example of casting weight calculationSimulation of disc deflection under pressure
NOTES1. Listed data are valid for 150 psi rated valve only.2. Rated Cv = 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. Cv-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.
NOTES1. 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 460 + 461 always have a dry shaft (rubberized shaft).5. In all trims: Disc pin material is same as shaft material.6. Contact factory for other materials, configurations and options.
MATERIAL SELECTIONBody Disc Body seat Shaft Disc Seal Retaining ring Trim No.Ductile iron Ductile iron Stainless Steel 316 Stainless Steel 431 EPDM Stainless Steel 316 450Ductile iron Ductile iron Ductile Iron (Epasfill) Stainless Steel 431 EPDM Stainless Steel 316 451Ductile iron Ductile iron Stainless Steel 316 Stainless Steel 431 EPDM Ductile iron 452Ductile iron Ductile iron Ductile Iron (Epasfill) Stainless Steel 431 EPDM Ductile iron 453Ductile iron RL Ductile iron RL Ductile iron RL Stainless Steel 431 EPDM Stainless Steel 316 460Ductile iron RL Ductile iron RL Ductile iron RL Stainless Steel 431 EPDM Ductile iron RL 461Ductile iron RL Ductile iron RL Ductile iron RL Duplex SS 1.4462 EPDM Stainless Steel 316 457Ductile iron RL Ductile iron RL Ductile iron RL Duplex SS 1.4462 EPDM Ductile iron RL 464
MATERIAL SPECIFICATIONPartname Material Material number RemarkBody Ductile Iron A 536 Gr.65-45-12Disc Ductile Iron A 536 Gr.65-45-12Retaining ring Stainless steel Grade 316
Ductile iron A 536 Gr.65-45-12 Other available materials for body, disc and retaining ring likeA 395 Gr.60-40-18, ASTM A 216 WCB, ASTM A 352 LCB,BS 2789 gr.420-12, ASTM A 352 LCB, ASTM A 351-CF8M etc.
Seal EPDM Temperature range 0°F to +220°F (-18 to + 104°C)NBR Temperature range 15°F to +180°F (-10 to + 80°C)
Shaft Stainless steel ASTM A 276-431 Alternatives: Grade 316 and DuplexBearings Self lubricating PTFE-lined Bronze bearings alternativelyBody-seat Stainless steel Grade 316 Alternative: Epasfill lined ductile iron, rubber linedDisc pin Stainless steel ASTM A 582-430F Alternative: DuplexSeal cover Stainless steel Grade 316Bottom cover Ductile Iron A 536 Gr.65-45-12Axial positioning ring Stainless steel Grade 316O-rings and seal NBR-rubberInternal screws Stainless steel Grade 316Axial bearings Glass cloth reinforced PTFEAdjustable stuffing boxBracket Ductile iron A 536 Gr. 64-45-12Gland Ductile iron A 536 Gr. 64-45-12Packing Braided TFE Hamar TP
PARTS LISTPart name Part name Part name1 Body 9 Axial positioning ring 17 Screws bottom shaft2 Disc 10 Body seat 1) 18 Screws bottom cover3 Retaining-ring 11 Disc pin 19 Screws seal 2)
4 Seal 12 Seal cover 20 Axial bearing5 Top shaft 13 Shaft seal6 Bottom shaft 14 O-ring7 Bearings 15 Screws body seat8 Bottom cover 16 Screws retaining ring
NOTES1) 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
- 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
3. Fabricated designFor 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.
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
24” Butt weld Dubex valves in production
Computer simulation of CBCVExample of 72” combined butterfly check valve for a power station cooling water system
AVAILABLE TECHNICAL OPTIONS
1. Dry shaft optionAlternative 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.