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Wafer Resilient Seated Butterfly Valve




      RBV010 Series is a line of WAFER type concentric resilient seated butterfly valve, which is designed to meet the stringent requirements of industrial applications and to provide reliable performanc­ es under various work ing conditions.

      The RBV01 0 Series Butterfly Valve comes with 3 different exteriors while sharing the same general design features.

      RBV010-H SERIES

      Wafer type concentric hard backup seat de­ signing, size from 2” 24” (DN50-600)

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      RBV010-C2 SERIES

      Wafer type concentric soft backup seat with groove and tongue designing, size from 2” 24” (DN50-600)


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      Wafer  type concentric  soft backup seat with groove and tongue designing, size from 2”      -24” (DN50-600)

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  Water & Wastewater Treatment 

      Desalination Plants


      District Cooling System HVAC

      Power stations I FGD

      Petroleum Refining & Oilfield Shipbuilding


      Steel Production 

      Aluminum Production 

      Mining  Applications 

      Chemical Applications 

      Ultrapure Water 


      Food Processing 


      Brewing/Wine Making 


      Pulp & Paper



Temperature Range

      Depending on different materials used for the valve seat, RBV Series butterf1y valve 1s applicable to a wide range of working temperature.

                         Material              Working Temperature
EPDM-20 °F (-29°C )~250 °F (121°C
BUNA-N0°F ( -18°~212 °F (100°C )
Viton0F ( -18°  ~400° F (204°C )
Polyurethane-20 °F ( -29°~176 °F (80°C )
PTFE-Lined EPOM (Standard)-20 °F ( -29°~250 °F (121°C )
PTFE Lined EPOM (High Temp)-20 °F (-29°)~ 302 °F (150°C )
Virgin PTFE  Conductive PTFE0°F (-18° C~392 °F (200°C 
UHMWPE0°F ( -18° C~185 °F (85°C )


 Different Disc /Seat material combinations in RBV010 Series are available to be chosen according to different media and working conditions. Experienced senior SISCO engineers are here to serve you providing professional advices to meet your particular requirements.      

      Bill of Material


                         Part Name                           Material

Cast Iron

Ductile Iron

Body Coating

Epoxy Coating


ASTM 304/316 Stainless Steel

Super Duplex Stainless Steel

Aluminum Bronze

Disc Sufacing


Nylon Coating

Halar Coating

Coated with NBR

Coated with PTFE


ASTM 304/316 Stainless Steel

ASTM 416/420 Stainless Steel

Super Duplex Stain less Steel

Monel  Metal



EPDM/EPDM-Food Grade






      International Compatibility / Bi-directional Sealing

      Full EPDM Lining / Dry Shaft Design

      Smaller Operating Torque / Easy installation & Maintenance Full bore feature


      International Compatibility

      Top Flange:

      RBV010 Series top flanges mounting meets ISO 5211 standard for direct mounting of Handles, Gear Operators, Pneumatic and Electric Actuators, no brackets are required, which allows of simple installation in the field, minimizes possible misalignment and reduces overall height.

      Side Flange:

      Connection compatibility design allows RBV010 Series Butterfly Valve to be installed between flanges of DIN PN 10/16, BS and ASME Class 150 simultaneously.


      Bi-Directional Sealing

      Concentric resilient seated design features the Series bi-directional bubble tight shut off with zero leakage. Bi-directional sealing breaks the directional limitation during installation ,making it much more flexible and  more achieving friendly working. Zero leakage perfects the sealing performance especially in Gas and Air applications.

      Full EPDM Lining

      Full EPDM lined valve interior completely isolating the line media from the body eliminating unnecessary contacts between media and body. Body material therefore does not have to be corrosion resistance materials, which usually being expensive, this feature lowers the overall cost.

      Dry Shaft Design

      Alternative to high corrosion resistance shaft materials the RBV010 valves are equipped with the dry shaft provision .In that case the shaft with standard material is protected from the  medium by applying rubber lining. This lining protects the standard shaft material against corrosive environments.


      Smaller Operating Torque

      Replaceable tongue and groove seat design Lowers the opening and closing torque which makes operation easier as well as saving cost in actuator selection




      On piece wafer style. All bodies are drilled to be compatible with DIN PN10, PN16, and ANSI 150 side f1ange connection simultane- ously. Valve mounting top f1anges meet ISO 521 1 standard for direct mounting of manual operators and power actuators.


      Surface Coating

      As  standard  body coating, Fusion  Bonded Epoxy coating is applied for excellent corro- sion resistance. Hammer painting, Nylon,PPS, Halar ,and  sweat  proof coating  are available as options.


      Machined valve body is carefully prepared before coating. SISCO standard procedure is Zinc coated before epoxy coating to achieve ideal quality. For customers who have special requirement of cost saving, sand blasting and acid washing is implemented instead of zinc coating.


      The high strength casting discs are casted by once, the sealing edges are spherically machined, and then hand polished to provide 360°concentric seating bidirectional l bubble-tight shut off, minimum torque and longer seat life. The symmetrical disc profile enhances valve perfo-rmance by increasing the Cv valves, reducing turbulence and increasing pressure recover y. The disc O.D. clearance is designed to work with all standard piping.






      The replaceable tongue and groove resil­ ient seat offers lower torque and provides complete isolation of flowing medium from all valve components (excluding the disc) by a totally encasing design The seat features a molded tangential 0 ring elimi­nating any need for flange gaskets.

     Soft backup seat

      EPDM is the abbreviated name for Eth­ ylene Propylene Diene Monomer. In gen­eral industry, one may see other abbrevia­tions or trade names used in lieu of EPDM such as EPT, Nordel, ECO, or EPR. Typically these a re the same materials as EP DM. EPDM is a standard seat material offered in SISCO resilient-seated butterfly valves. It is the most universal and economical of seat materials offered by SISCO; that is, it may be used in a wider range of applications than BUNA N.


      Hard backup seat


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      Single shaft pin-less disc connection and double shafts pin-less disc connection are both available to be chosen according to customers'preference.

      Alternative to high corrosion resistance shaft materials, RBV01 O is equipped with the dry shaft design because of its concentric nature and axial sea ling design where standard material shaft is completely isolated from the flowing media.

      Precision machining of the disc and the stem connection mini­ mizes hysteresis and produces maximum strength engagements.

      Both disc/stem designs inherently provide complete protection from particle entrapment and bacteria l decay, protection that is required for sanitary performance. For superior erosion and a bra­ sion resistance, the one piece disc/stem is fully encased in either EPDM Or BUNA-N.

      For double shafts pin-less design, precision double "D" or "Square" disc to stem connection drives the disc without the need for screws or pins. The close tolerance, double "D” or "Square" connection that drives the valve disc are exclusive features of the SISCO valve. Disassembly of the shaft is just a matter of pulling the stem out of the disc.

      All stem designs incorporate a blow-out proof feature.




      Blow-out Proof

      A retaining ring, installed  between the machined stem groove and gland retain­ er step, provides full retention of the stem in the unlikely event of internal stem fail­ure.


      Shaft Bushing

      Non-corrosive, phenolic resin bushing ab­ sorbs actuator side thrust. Brass bushing is also available to choose.

      Primary & Secondary Seals

      These seals prevent line media from con­tacting  with  the  stem  or  body. Primary Seal  is achieved  by an interference fit of the  molded seat flat and the dischub. Secondary Seal  is created because the stem diameter  is bigger than the diameter of the seat stem hole. Self-adjusting triple 0ring sealing is also applied to give positive sea ling in both directions and prevents external substances from enter­ing the stem bore.