Other Keystone Equipment

Keystone Dubex RMI Butterfly Valve


The Keystone Dubex RMI is a Double Flanged Butterfly Valve for use in the water industry. The Dubex RMI has a triple eccentric design and is resilient seated. The Keystone Dubex RMI can be used in drinking water applications, waste water applications and cooling water applications.


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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 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.
Pressure: 16 bar pressure: till DN 2600 larger sizes
Temperature: -20°C up to 100°C
Flange accommodation: ISO flange PN 10, PN 16, PN 25 (standard)
Drilling: ISO 2084 (other drillings on request)
Sizes: DN 150 - DN 4000