Wafer Type Butterfly Valve

Technical Summary

Nominal Size: 2” to 48”

Pressure Class: PN10 / PN16 / Class 150

Temperature Range: -20°C to 200°C

Design Standards: API 609, ASME B16.34, MSS SP-67

Face to Face: API 609, EN 558 Series 20

End Connections: Wafer type for installation between flanges

Inspection and Testing: API 598

Construction and Materials

Body and Pressure Retaining Parts

• Cast Iron
• Ductile Iron
• Carbon Steel
• Stainless Steel

Internal Components

• Disc: Stainless Steel / Ductile Iron / Aluminium Bronze
• Stem: Stainless Steel
• Bearing: Metal backed bearing design

Sealing System

• Seat: EPDM / NBR / Graphite / Metal seated design
• Packing: Graphite / standard stem sealing arrangement
• Gasket: Sealing achieved through seat design and flange gasket

Functional Design

Wafer Type Butterfly Valve is designed for compact installation between two pipe flanges, using flange bolts to hold the valve body in position. The wafer design ensures proper alignment within the pipeline while minimizing weight and installation space.

The quarter-turn disc mechanism enables quick opening and closing with low operating torque. This configuration is suitable for isolation and basic flow control in systems where space efficiency and ease of installation are important.

Material and Grade

Standard Materials

Component	Material	Grade	Typical Application
Body	Cast Iron	ASTM A126 Class B	Water distribution and general utility service
Body	Ductile Iron	ASTM A536	Water treatment and general industrial service
Body	Carbon Steel	ASTM A216 WCB	Industrial process and moderate pressure systems
Body	Stainless Steel	ASTM A351 CF8 / CF8M	Corrosive media and chemical service
Disc	Stainless Steel	CF8M / SS316	Corrosion resistance and sealing performance
Disc	Aluminium Bronze	C95400 / C95800	Marine and seawater service
Stem	Stainless Steel	SS410 / SS316	Strength and corrosion resistance

Extended Materials (On Request)

• Duplex Stainless Steel (F51) for chloride-rich environments
• Super Duplex Stainless Steel (F53 / F55) for severe corrosion service
• Alloy 20 for acidic chemical applications
• Hastelloy C276 for aggressive chemical media

Additional Information

Valve Type	Wafer Type Butterfly Valve
Operation	Lever / Gear / Electric Actuated / Pneumatic Actuated
Body Style	Wafer body design
Disc Movement	Quarter-turn operation
Installation	Installed between flanges using through bolts
Seat Design	Resilient seated / Metal seated
Port Configuration	Compact, lightweight flow path

End Connections

• Wafer type body suitable for installation between flanges
• Flange compatibility: ANSI Class 125 / 150, PN10 / PN16, JIS standards

Applications

• Water and wastewater treatment: isolation in distribution systems
• Oil and gas industry: utility and non-critical process lines
• Marine industry: seawater and cooling systems
• Power generation: cooling water and auxiliary systems
• Chemical processing: corrosive fluid handling and shut-off service
• General industrial systems: compact isolation in process piping