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Butterfly Valve, Wafer Type, Cast Iron Body
Butterfly Valves

Butterfly Valve, Wafer Type, Cast Iron Body

High-performance wafer type butterfly valve with cast iron body. Double offset (Double Eccentric) design ensures bubble-tight sealing. Suitable for water, wastewater, and general industrial 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)
  • Face to Face: ISO 5752 Short

Suitable For

Water Wastewater General Industrial

Double offset design provides bubble-tight sealing with reduced operating torque. EPDM/NBR/PTFE seat options available for different media.

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Salient Features

  • Double Offset (Double Eccentric) Design for Bubble-Tight Sealing
  • Wafer Type Pattern for Easy Installation Between Flanges
  • Face to Face: ISO 5752 Short
  • Flanges: ANSI B16.5 Class 150
  • Disc: Cast Iron / Al-Bronze Options
  • Seat: EPDM / NBR / PTFE Options for Different Media
  • Quarter-Turn Operation for Quick Opening/Closing
  • Low Torque Operation Reducing Actuator Requirements

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)
2504360924xM16
2 1/26546761124xM16
38046891274xM16
4100521141574xM16
5125561411864xM16
6150561682164xM20
8200602192708xM20
10250682733308xM20
12300783244068xM20
143507835644812xM24
1640010240651112xM24
1845011445754612xM24
2050012750860516xM24
2460015461071816xM27

~ ±10mm tolerance

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Frequently Asked Questions

What is a wafer type butterfly valve?

A wafer type butterfly valve is a quarter-turn valve designed for quick opening and closing. It features a thin disc that rotates 90 degrees to control flow. The wafer design allows for easy installation between two flanges without the need for separate bolt holes. Double offset (double eccentric) design provides bubble-tight sealing with reduced torque.

What is the difference between single offset and double offset butterfly valves?

Single offset valves have the stem offset from the disc center and the disc center from the body center. Double offset (double eccentric) valves have two offsets: one for the stem from disc center, and another for the body seating surface from the centerline. This design provides better sealing at high pressures and reduces seat wear, resulting in bubble-tight sealing and longer service life.

What materials are available for butterfly valve discs and seats?

Disc materials include Cast Iron (FG200), Ductile Iron (ASTM A395), Aluminum Bronze (Al-Bronze), and Stainless Steel (SS316). Seat materials include EPDM (for water and mild chemicals), NBR (for oil and gas applications), and PTFE (for high temperature and corrosive media). Material selection depends on the application, media, temperature, and pressure requirements.

What are the standard face-to-face dimensions for wafer type butterfly valves?

Wafer type butterfly valves typically follow ISO 5752 Short face-to-face dimensions. Flange connection follows ANSI B16.5 Class 150 standard. This allows for interchangeability with standard industry valves of the same size and pressure class.

What testing is performed on butterfly valves before delivery?

All butterfly valves undergo shell testing at 1.5 x PN (pressure rating) and seat testing at 1.1 x PN. This ensures bubble-tight sealing and structural integrity. Tests include hydrostatic shell test, seat leak test, and operational torque test. Material test certificates (MTC) and pressure test reports are provided with each valve.