What is a lug type butterfly valve and when should it be used?

A lug type butterfly valve has fully threaded lugs on the body that accept bolts from both sides. This design allows for dead-end service (valve can isolate a section without downstream flange) and easy maintenance without removing the valve from the pipeline. Ideal for water distribution, HVAC, and applications requiring periodic maintenance.

What is the advantage of full lug pattern over wafer type?

Full lug pattern provides ability to use the valve for dead-end service without requiring a downstream flange. This is essential for maintenance isolation points, testing, and applications where the pipeline cannot be fully assembled during installation. Wafer type valves require flanges on both sides to maintain position.

What applications are suitable for lug type cast iron butterfly valves?

Lug type cast iron butterfly valves are ideal for water and wastewater treatment, HVAC systems, building services, irrigation, and general industrial applications. They are commonly used as isolation valves where dead-end service capability is required. Not recommended for high-temperature steam or abrasive media.

How does double offset design improve valve performance?

Double offset (double eccentric) design moves the stem centerline away from the disc center and seats the seal ring on a slightly different axis. This geometry reduces seat wear during operation, provides consistent sealing at high pressures, and requires lower operating torque. Results in bubble-tight shutoff and longer seat life.

What maintenance is required for lug type butterfly valves?

Regular inspection of stem seals and O-rings for leakage, periodic operation to prevent sticking, and visual inspection of disc and seat for wear. The valve can be maintained in-line by removing the retaining plate and stem. No special tools required for routine maintenance. Replacement of seat can be done without removing valve from pipeline.

Butterfly Valves

Butterfly Valve, Lug Type, Cast Iron Body

Name: Butterfly Valve, Lug Type, Cast Iron Body
Brand: Supreme Valves India
SKU: SV-BFV-LUG-CI
Rating: 4.7 (76 reviews)

Premium lug type butterfly valve with cast iron body featuring full lug pattern for dead-end service. Double offset (Double Eccentric) design ensures bubble-tight sealing. Ideal for water, wastewater, and HVAC applications. Sizes from 2" to 24" (50mm to 600mm) with PN 10/16 pressure rating.

Specifications

Sizes: 2" to 24" (50mm to 600mm)
Pressure Rating: PN 10/16
Design: Double Offset (Double Eccentric)
Pattern: Full Lug for Dead-End Service

Suitable For

Water Wastewater HVAC

Full lug pattern allows dead-end service capability without downstream flange. Perfect for maintenance isolation points.

Request Enquiry WhatsApp Download Datasheet

Salient Features

Full Lug Pattern for Dead-End Service Capability
Double Offset (Double Eccentric) Design for Bubble-Tight Sealing
Disc: Cast Iron / Al-Bronze Options
Seat: EPDM / NBR / PTFE Options for Different Media
Stem: SS 410 Stainless Steel
Face to Face: ISO 5752 Short
Flanges: ANSI B16.5 Class 150
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	92	4xM16
2 1/2	65	46	76	112	4xM16
3	80	46	89	127	4xM16
4	100	52	114	157	4xM16
5	125	56	141	186	4xM16
6	150	56	168	216	4xM20
8	200	60	219	270	8xM20
10	250	68	273	330	8xM20
12	300	78	324	406	8xM20
14	350	78	356	448	12xM24
16	400	102	406	511	12xM24
18	450	114	457	546	12xM24
20	500	127	508	605	16xM24
24	600	154	610	718	16xM27

~ ±10mm tolerance

Need a Custom Enquiry?

Contact our technical team for pricing, bulk orders, or custom specifications.

Purchase Options

Add to Cart Request Enquiry WhatsApp