More than 20 years of OEM and ODM service experience.

Industrial Free stem butterfly valve China factory supplier Manufacturer

Short Description:

Free stem butterfly valve , Resilent seated butterfly valves ,

Centric shaft position,100% bi-directional bubble tightness

Pinless disc design to prevent the leakage from the disc

NPS 1.5”-24”  Mounted between flanges ANSI B16.1,ASME B16.5

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

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

Face-to-Face dimension: API 609, ISO 5752, BS EN 558, BS 5155, MS SP-67.

Lever / worm gearbox operator / electric operator / pneumatic operator

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

NORTECH is one of the leading China Free stem butterfly valve Resilient seated Butterfly  Manufacturer & Supplier.


Product Detail

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What is Free stem butterfly valve ?

Free stem butterfly valve Resilient Seated 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.

The movement of the disc will determine the position of the butterfly valve.The resilient seated butterfly valve lug type can work as isolating valve if the disc rotates a full 90-degree turn, the valve is completely opened or closed.

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)

Free stem butterfly valve Resilient Seated 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 NORTECH Free stem butterfly 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 Free stem butterfly valve resilient seated butterfly valves  

  • 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.
  • Pinless disc design is helpful to prevent the leakage point on the disc.
  • ISO 5211 top flange is convinient for easy automation and retrofitting of actuator.
  • 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 Resilient seated butterfly valves lug type

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 Free stem butterfly valve

Free stem butterfly valve 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 Free stem 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
Liner EPDM/NBR/FPM/PTFE/Hypalon
Stem Stainless steel/Monel/Duplex
Bushing PTFE
Bolts Stainless steel

Valve body materials of Free stem butterfly valve 

Ductile iron
  • GGG40/50
  • GGG40.3(heat treated)
  • ASTM A536 60-40-18
  • BS2789 400-18
  • General application
  • Heavy applications,Cold applications,petrochemical industries,power stations
Stainless steel
  • ASTM A 351 CF8/CF8M
  • Duplex UB6/31803
  • Medicine,food,drink
Alu-bronze
  • ASTM B584 C95400
  • BS 1400 LG1
  • DIN 1705(RG10)
  • Marine Service

Valve disc materials of resilient seated butterfly valve lug type

Ductile iron nickel coated
  • GGG40/50
  • GGG40.3(heat treated)
  • ASTM A536 60-40-18
  • BS2789 400-18
  • Air, non corrosive hot or cold water
Ductile iron nylon coated
  • GGG40/50
  • GGG40.3(heat treated)
  • ASTM A536 60-40-18
  • BS2789 400-18
  • Potable water, water(max. 70°C, PH value between 4.5 and 9)
Ductile iron PTFE lined
  • GGG40/50
  • GGG40.3(heat treated)
  • ASTM A536 60-40-18
  • BS2789 400-18
  • Acids,alkalis,oil,water,air
Stainless steel
  • ASTM A 351 CF8/CF8M
  • Potable water, demineralized water, solvents, industrial water
Duplex stainless steel
  • Duplex UB6/31803
  • Potable water, cooling water, sea water, demineralized water, solvents, foodstuff
Alu-bronze
  • ASTM B584 C95400
  • BS 1400 AB2
  • DIN 1714-CuAl10Ni
  • Sea water, potable water, gas
Hasterlloy-C
  • CW-12MW A494
  • Phosphoric, hypochloric, acetic, formic, sulfurous

Rubber sleeve liner of Free stem butterfly valve 

NBR 0°C~90°C Aliphatic hydrocarbons(fuels,low aromatic containing oils,gasses),sea water,compressed air,powders,granular,vacuum,gas supply
EPDM -20°C~110°C Water in general(hot-,cold-,sea-,ozone-,swimming-,industrial-, etc).Weak acids,weak salt solutions,alcohols,ketones,sour gasses,sugar juice
Sanitary EPDM -10°C~100°C Potable water, foodstuffs, unchlorined drinking water
EPDM-H -20°C~150°C HVAC, chilled water, food stuffs & sugar juice
Viton 0°C~200°C Many aliphatic, aromatic and halogen hydrocarbons, hot gasses, hot water, steam, inorganic acid, alkali

 

Product Application: Free stem butterfly valve

Where is the resilient seated butterfly valve wafer type used?

Free stem butterfly valve, 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
  • 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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