What are the key benefits of lug type ductile iron butterfly valves?

Lug type ductile iron butterfly valves combine the benefits of full lug pattern (dead-end service capability, in-line maintenance) with the superior strength of ductile iron (ASTM A395). They offer higher pressure ratings (PN 16/25), better impact resistance, and longer service life compared to cast iron lug valves. Ideal for demanding water, wastewater, and industrial applications.

When should I choose lug type over wafer type butterfly valves?

Choose lug type when you need dead-end service capability (valve can isolate a section without downstream flange), when periodic maintenance is required without draining the pipeline, or when the downstream flange cannot be installed during initial assembly. Wafer type is preferred for between-flange installation where dead-end service is not required and cost is a consideration.

What applications are best suited for ductile iron lug butterfly valves?

Ductile iron lug butterfly valves excel in water distribution networks, wastewater treatment plants, HVAC systems, building services, fire protection systems, and industrial process lines where higher pressures and dead-end capability are required. The ductile iron body handles thermal cycling and pressure surges better than cast iron.

What is the difference between PN 16 and PN 25 ratings for ductile iron valves?

PN (Pressure Nominal) indicates maximum allowable pressure at reference temperature. PN 16 valves are rated for up to 16 bar (232 psi) and PN 25 for up to 25 bar (363 psi). Selection depends on system design pressure with appropriate safety margin. PN 25 valves have thicker body walls and reinforced components to withstand higher pressures.

How does double offset design benefit ductile iron butterfly valves?

Double offset (double eccentric) design in ductile iron valves provides superior sealing performance by having the disc seat contact point offset from the stem centerline. This reduces seat wear during operation, provides consistent bubble-tight sealing at high pressures, lowers operating torque, and extends service life. Essential for PN 16/25 rated applications.

Butterfly Valves

Butterfly Valve, Lug Type, Ductile Iron Body

Name: Butterfly Valve, Lug Type, Ductile Iron Body
Brand: Supreme Valves India
SKU: SV-BFV-LUG-DI
Rating: 4.8 (52 reviews)

Premium lug type butterfly valve with ductile iron body featuring full lug pattern for dead-end service. Double offset (Double Eccentric) design provides superior sealing at higher pressures. Ideal for water, wastewater, and industrial applications. Sizes from 2" to 24" (50mm to 600mm) with PN 16/25 pressure rating.

Specifications

Sizes: 2" to 24" (50mm to 600mm)
Pressure Rating: PN 16/25
Design: Double Offset (Double Eccentric)
Pattern: Full Lug for Dead-End Service

Suitable For

Water Wastewater Industrial Fire Protection

Full lug pattern + Ductile Iron body combines dead-end service capability with superior strength for PN 16/25 applications.

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Salient Features

Full Lug Pattern for Dead-End Service Capability
Ductile Iron Body (ASTM A395) for Higher Strength
Double Offset (Double Eccentric) Design for Superior Sealing
Disc Options: Ductile Iron / Al-Bronze / Ni-Resist
Seat Options: EPDM / NBR for Various Media
Stem: SS 431 Stainless Steel
PN 16/25 Pressure Rating for Higher Pressure Applications
In-Line Maintenance without Removal from Pipeline

Materials of Construction (MOC)

Component	Material Specification
Body & Bonnet	Ductile Iron (ASTM A536 / EN-GJS-400-15)
Stem / Spindle	SS 410 / SS 420
Seat / Trim	EPDM / NBR / Bronze

Technical Specifications

Parameter	Specification / Standard
Manufacturing / Design Standard	EN 1171 / AWWA C509 / BS 5163
Testing Standard	API 598 / EN 12266-1
Pressure Rating	PN16 / PN25

Test Pressure

Test Type	Pressure	Duration
Shell Test (Hydrostatic)	1.5 x PN	Per API 598 / BS 6755
Seat Test	1.1 x PN	Per API 598 / BS 6755

Sizes / Dimensions

Size (Inches)	Size (mm)	L (Face to Face)	ØA ~	ØB ~	Lug Pattern
2	50	43	60	98	4xM16
2 1/2	65	46	76	118	4xM16
3	80	46	89	132	4xM16
4	100	52	114	162	4xM16
5	125	56	141	192	4xM20
6	150	56	168	218	4xM20
8	200	60	219	278	8xM20
10	250	68	273	338	8xM20
12	300	78	324	418	8xM24
14	350	78	356	460	12xM24
16	400	102	406	525	12xM27
18	450	114	457	560	12xM27
20	500	127	508	615	16xM27
24	600	154	610	730	16xM30

~ ±10mm tolerance

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