Keystone Dubex – RMI AWWA Butterfly Valves

• 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 Keystone Dubex – RMI body seat landing surface has the shape of an oblique cone with the ground surface perpendicular to one side of the cone
• Triple eccentric design, along with a resilient disc seal, ensures bi-directional drop-tight shutoff per the AWWA C504 specifications.
• In-line replaceable resilient disc seal.
• Fully rated dead end service.
• Standard body seating surface is ductile iron with Epoxy lining (Epasfill). Alternative seating surfaces such as stainless steel are available on request.
• Dry shaft option available.
• Axial bottom shaft bearing carrying the disc weight when installed with shaft in vertical position and ensuring accurate centering of the disc assembly.
• Reversed V-shaped packing for vacuum applications.
• Open brackets for packing access and adjustments are available on request.
• Self-lubricating bearings are PTFE lined. Alternative bushing materials are available on request.
• Horizontal or vertical shaft mounting.
• Low head loss, suitable for throttling services.
• Face-to-face:
  • According AWWA C504-06 short
  • Above 72": manufacturer standard
  • Alternative face-to-face dimensions on request
• AWWA POD (Proof Of Design) certificates for valves and gear units available.
• Clockwise closing, optional counter clockwise closing.
• Suitable for manual gear, electric, hydraulic and pneumatic actuation.
• Self-adjusting V-shaped shaft packing available.
• Performance testing in compliance with AWWA C504 requirements.
• Valves are cycle tested as per AWWA C504 requirements.

Applications:
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:
AWWA, NSF 61 on applied materials WRC/NSF

Technical Data
Sizes: 6" to 160"

Pressure: 6" to 48" – 350 psi
up to 86" – 250 psi
up to 120" – 150 psi
above 120" – contact sales

Temperature: 0 to 220°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