Lug 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: Lugged body for flanged pipeline installation

Inspection and Testing: API 598

Construction and Materials

Body and Pressure Retaining Parts

• Cast Iron
• Ductile Iron
• Carbon Steel
• Stainless Steel
• Aluminium Bronze

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: Suitable for flanged installation

Functional Design

Lug Type Butterfly Valve is designed with threaded lug inserts integrated into the valve body, allowing direct bolting between two pipe flanges. This configuration supports installation flexibility and enables maintenance of one side of the pipeline without disturbing the opposite side.

The quarter-turn disc mechanism provides fast operation with low torque requirements. The design is suitable for isolation service and compact installations where space and accessibility are critical.

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 higher pressure utility service
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	Lug Type Butterfly Valve
Operation	Lever / Gear / Electric Actuated / Pneumatic Actuated
Body Style	Lugged body design
Disc Movement	Quarter-turn operation
Installation	Suitable for flanged pipelines and limited dead-end service
Seat Design	Resilient seated / Metal seated
Port Configuration	Full flow through compact body design

End Connections

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

Applications

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