More than 20 years of OEM and ODM service experience.

EPDM Seat to Water Lug Butterfly Valve China factory with high quality

Short Description:

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

Easy maintanance with replaceable parts

Function as isolation valve and flow regulating valve.

wide range of application and low cost.

Wafer type between flanges of various standard

Pinless disc design to prevent the leakage from the disc

Compact design and simple structure

Diameter 40mm – 600 mm between flanges EN1092 PN10,PN16,PN25

Design standard: API 609, BS EN 593, MSS SP-67.

Lever / worm gearbox operator / electric operator / pneumatic operator

Working Pressure: PN10/16/25,Class125/150

 


Product Detail

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What is Butterfly Valve?

Butterfly Valve,is also referred to as “concentric”,"rubber lined" and “rubber seated” butterfly valve,has a rubber (or resilient) seat between the external diameter of the disc and the internal wall of the valve.

Butterfly valve is 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.

Butterfly Valve,the most compact design with short face to face.it's fit between two flanges,with studs passing from one flange through other. The valve is held in place and sealed with gasket by the tension of studs.A resilient seated butterfly valve lug type is a lightweight, maintenance-free, cost-effective, and reliable solution to various applications.

Butterfly Valve,is usually used where the valve is at the end of the pipe since there is no 2nd flange to secure the studs. Instead, lugs are cast on the valve with tapped holes which matches the bolt pattern for the size and pressure classification of the flange. Bolts are passed through the flange holes and are threaded into tapped holes of the lug.

Main Features of NORTECHbutterfly valve

WHY TO CHOOSE US?

  • 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 butterfly valves 

  • 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.
  • 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.
  • 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.
  • Inserted lining to the body, liner easy to replace,no corrosion between body and lining, suitable for end of line use.

Resilient seated butterfly valve lug type design features of pinless disc

reslient-seated-butterfly-valve-lug-type-02
splined-shaft

Precision splined shaft

For diameter DN32-DN350

rubber-sleeve-seat-design

Moulded rubber sleeve

hexagon-shaft

Hexagon shaft

For diameter DN400 and above

reslient-seated-butterfly-valve-lug-type-01

Types of Operation for butterfly valves 

Handle lever 
  • Butterfly valve PN10/16,Class125/150 DN32-DN200
  • Butterfly valve PN25,DN32-DN150
Manual gearbox
  • full range from DN32-DN600
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.        
lever
manual-gear
pneumatic-actuator
electric-actuator
free-stem

Technical specification of butterfly valves

Standards:

Design and Manufacturer API609/EN593
Face to face ISO5752/EN558-1 series 20
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 butterfly valves:

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
Liner EPDM/NBR/FPM/PTFE/Hypalon
Stem Stainless steel/Monel/Duplex
Bushing PTFE
Bolts Stainless steel

 

Product Application:

Where is the resilient seated butterfly valve wafer type used?

Butterfly valve  is widely used in

  • Water and waste effluent treatment plants
  • 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.

ACS
wras

Attestation de Conformité Sanitaire

(ACS)

Water Regulations Advisory Scheme

(WRAS)


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