Industrial Free stem butterfly valve China factory supplier Manufacturer
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
Precision splined shaft
For diameter DN32-DN350
Moulded rubber sleeve
Hexagon shaft
For diameter DN400 and above
Types of Operation for Resilient seated butterfly valves lug type
| Handle lever |
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| Manual gearbox |
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| Pneumatic actautor |
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| Electric actuator |
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| Free stem ISO5211 mouting pad |
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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 |
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| Stainless steel |
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| Alu-bronze |
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Valve disc materials of resilient seated butterfly valve lug type
| Ductile iron nickel coated |
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| Ductile iron nylon coated |
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| Ductile iron PTFE lined |
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| Stainless steel |
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| Duplex stainless steel |
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| Alu-bronze |
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| Hasterlloy-C |
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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.
Attestation de Conformité Sanitaire
(ACS)
Water Regulations Advisory Scheme
(WRAS)
