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Butterfly Valve, Wafer Type, Ductile Iron Body
Butterfly Valves

Butterfly Valve, Wafer Type, Ductile Iron Body

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 PNPer API 598 / BS 6755
Seat Test1.1 x PNPer API 598 / BS 6755

Sizes / Dimensions

Size (Inches) Size (mm) L (Face to Face) ØA ~ ØB ~ ØC (Flange)
2504360984xM16
2 1/26546761184xM16
38046891324xM16
4100521141624xM16
5125561411924xM20
6150561682184xM20
8200602192788xM20
10250682733388xM20
12300783244188xM24
143507835646012xM24
1640010240652512xM27
1845011445756012xM27
2050012750861516xM27
2460015461073016xM30

~ ±10mm tolerance

Related Products

Butterfly Valve, Wafer Type, Cast Iron

Cost-effective cast iron option for lower pressure

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Full lug pattern for dead-end service

CS Butterfly Valve

Carbon steel construction for high temperature

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Frequently Asked Questions

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.