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 other manufacturers' 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.

Butterfly Valves

Butterfly Valve, Wafer Type, Cast Iron Body

Name: Butterfly Valve, Wafer Type, Cast Iron Body
Brand: Supreme Valves India
SKU: SV-BFV-WAFFER-CI
Rating: 4.8 (89 reviews)

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 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	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

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