What are the advantages of ductile iron over cast iron for butterfly valves?

Ductile iron (ASTM A395) offers significantly higher strength and impact resistance compared to conventional cast iron (IS 210 FG200). It can withstand higher pressures (PN 16/25 vs PN 10/16), has better elongation properties, and is more suitable for demanding applications. The yield strength of ductile iron is approximately 3x that of gray cast iron.

What disc material options are available for ductile iron butterfly valves?

Standard disc options include Ductile Iron (ASTM A395), Aluminum Bronze (Al-Bronze), and Stainless Steel 316. Al-Bronze is recommended for water and wastewater applications. SS 316 disc is ideal for corrosive media and chemical processing. Ductile iron disc provides cost-effective solution for general water service.

What seat material options are available and when should each be used?

EPDM (Ethylene Propylene Diene Monomer) is ideal for water, wastewater, and mild chemical service up to 120C. NBR (Nitrile Butadiene Rubber) is suitable for oil, gas, and petroleum products up to 80C. Viton (FKM) is recommended for high-temperature applications and corrosive chemicals up to 200C. Material selection should match the intended media and temperature.

What pressure ratings are available for ductile iron wafer butterfly valves?

Ductile iron wafer butterfly valves are available in PN 16 and PN 25 pressure ratings, suitable for higher pressure applications compared to cast iron valves. The higher strength of ductile iron body allows operation at elevated pressures without compromising structural integrity or safety factors.

What is the temperature range for ductile iron butterfly valves?

Standard temperature range depends on seat material: EPDM seats typically operate from -20C to +120C, NBR seats from -10C to +80C, and Viton seats from -10C to +200C. Body material (ASTM A395 ductile iron) is rated from -10C to +350C. Selection should consider both seat and body temperature limits for the specific application.

Butterfly Valves

Butterfly Valve, Wafer Type, Ductile Iron Body

Name: Butterfly Valve, Wafer Type, Ductile Iron Body
Brand: Supreme Valves India
SKU: SV-BFV-WAFFER-DI
Rating: 4.9 (64 reviews)

High-performance wafer type butterfly valve with ductile iron body for superior strength. Double offset (Double Eccentric) design provides bubble-tight 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)
Face to Face: ISO 5752 Short

Suitable For

Water Wastewater Industrial Chemical

Ductile iron body provides 3x higher yield strength than cast iron. Available with SS 316 disc for corrosive service.

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Salient Features

Ductile Iron Body (ASTM A395) for Higher Strength
Double Offset (Double Eccentric) Design for Superior Sealing
Wafer Type Pattern for Easy Installation Between Flanges
Disc Options: Ductile Iron / Al-Bronze / SS 316
Seat Options: EPDM / NBR / Viton for Various Media
Stem: SS 431 Stainless Steel (Higher Corrosion Resistance)
PN 16/25 Pressure Rating for Higher Pressure Applications
Face to Face: ISO 5752 Short, Flanges: ANSI B16.5 Class 150/300

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 ~	ØC (Flange)
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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