More than 20 years of OEM and ODM service experience.

Double Flange Butterfly Valve

Short Description:

Double flange butterfly valve

Design and Manufacture standard:API609/EN593

Rubber seat vulcanized directly on the body.

it could be used at the end of the pipeline.

Face to face:ISO5752/EN558-1 series 13

Flange end EN1092-2 PN10/PN16/PN25,ANSI 125/150

DN 50mm-1200mm

Body:Ductile iron/carbon steel/stainless steel/Alu-bronze

Disc:Ductile iron/carbon steel/stainless steel/Alu-bronze


NORTECH is one of the leading China Double Flange Butterfly Valve Manufacturer & Supplier.

Product Detail

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What's Double flange butterfly valves

Double Flange Butterfly Valve is type of resilient seated butterfly valves,with integral flanges cast on both ends.

same as all the other butterfly valves,it's a quarter-turn valve that rotates 90 degrees to open or close the media flow. It has a circular disc, also known as the butterfly, found at the center of the body that functions as the closing mechanism of the valve. The disc is connected to an actuator or handle through the shaft, which goes through from the disc to the top of the valve body.

Butterfly valve is also used as flow regulalting valve,if the disc does not rotate to a full quarter-turn, it means the valve is partially open,we can regulate the flow of fluids by various openning angle.

(CV/KV chart of resilient seated butterfly valve is available on request) 

NORTECH Double Flange Butterfly Valve is designed with long face to face,according to EN558-1 series 13. it can be used in many general applications such as in water distribution, water treatment, dams, power plants and in many other. The valve can be used as a stopper, a tap for discharging at the end of the pipeline, open/close and flow control. 

for large size pipeline,double flange butterfly valves are wided used.

Main features of Double flange butterfly valves

Double Flange Butterfly Valve design features of pinless disc


  • Quality and service:more than 20 years of experiences of OEM/ODM services for leading european valve companies.
  • Quick delivery,ready for shipment 1-4 weeks,with considerate stock of resilient seated butterfly valves and components
  • Quality guarantee 12- 24 months for resilient seated butterfly valves
  • Quality control for each piece of butterfly valve

Main features of Double Flange Butterfly Valve  

  • Compact construction results in low weight, less space in storage and installation.
  • Centric shaft position,100% bi-directional bubble tightness,which makes installation acceptable at any direction.
  • ISO 5211 top flange is convinient for easy automation and retrofitting of actuator.
  • Full bore body gives low resistance to flow.

  • No cavities in the flow passage,which makes it easy to clean and disinfect for potable water system etc.

  • Rubber lined internally in the body makes fluid not to contact the body.
  • Painless disc design is helpful to prevent the leakage point on the disc.
  • Low operating torques results in easy operation and economical actuator selection.
  • PTFE lined bearings are designed for anti-friction and wear,no lubrication is required.
  • Bonded rubber seat,vulcanised on the body,it's stable and suitable for vacuum application and end of line use.

please refer to our catalogue of butterfly valves for details or contact our sales team directly.


Design and Manufacture standard:API609/EN593

Face to face:ISO5752/EN558-1 series 13

Flange end EN1092-2 PN10/PN16/PN25,ANSI 125/150

DN 50mm-1200mm

Body:Ductile iron/carbon steel/stainless steel/Alu-bronze

Disc:Ductile iron/carbon steel/stainless steel/Alu-bronze


Pinless design



Types of Operation for Wafer Butterfly Valve

Handle lever 
  • Butterfly valve PN10/16,Class125/150 DN32-DN200
  • Butterfly valve PN25,DN32-DN150
Manual gearbox
  • full range from DN32-DN1400
Pneumatic actautor
  • Pneumatic actuator double acting(DA)
  • Pneumatic actuator spring return(SR)
Electric actuator
  • On-off type electric actuator
  • Modulating actuator
  • Water proof
  • Explosion proof
Free stem ISO5211 mouting pad   
  • stem dimension and ISO flange customized on request of customer.        

Technical specification of double flange butterfly valve


Design and Manufacturer API609/EN593
Face to face ISO5752/EN558-1 series 13
Flange end ISO1092 PN6/PN10/PN16/PN25,ANSI B16.1/ANSI B 16.5 125/150
Pressure rating PN6/PN6/PN16/PN25,ANSI Class125/150
Test and Inspection API598/EN12266/ISO5208
Actuator mounting pad ISO5211

Main parts materials of  Double flange Butterfly Valve:

Parts Materials
Body Ductile iron,carbon steel,stainless steel,duplex stainless steel,Monel,Alu-bronze
Disc Ductile iron nickel coated,ductile iron nylon coated/Alu-bronze/stainless steel/duplex/Monel/Hasterlloy
Stem Stainless steel/Monel/Duplex
Bushing PTFE
Bolts Stainless steel

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Product Application:

Where is the Double flange butterfly valves  used?

Double flange butterfly valves,same as all the other resilient seated butterfly valve,is widely used in

  • Water and waste effluent treatment plants
  • Paper, textiles and sugar industry
  • Construction industry, and drilling production
  • Heating, air conditioning, and cooling water circulation
  • Pneumatic conveyors, and vacuum applications
  • Compressed air, gas and desulphurization plants
  • Brewing, distilling, and chemical process industry
  • Transportation and dry bulk handling
  • Power industry

The resilient seated butterfly valves are certified with WRAS in UK and ACS in France,specially for the waterworks.



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