Butterfly Valve Connection Standard

Butterfly valves are widely used in industrial applications for regulating flow and are manufactured according to several connection standards. These standards ensure compatibility, safety, and reliability. Below are the common connection standards for butterfly valves:

1. Flanged Connections

Butterfly valves with flanged ends are designed to mate with standard pipe flanges. The key standards for flanged connections include:

• ASME B16.5: Pipe Flanges and Flanged Fittings (covers sizes from ½ inch to 24 inches, pressure classes 150 to 2500).
• EN 1092-1: Flanges and their joints for PN-designated pressure systems.
• ISO 7005-1: Metallic flanges for general purposes.
• JIS B2220: Japanese flange standard.

2. Wafer Type Connections

Wafer butterfly valves are designed to fit between two pipe flanges using bolts or studs.

• They are typically compatible with flange drilling patterns as per:
  • ASME B16.5
  • EN 1092
  • ISO 7005

3. Lug Type Connections

Lug butterfly valves have threaded inserts that allow them to be bolted to a pipe flange. Standards include:

• ASME B16.5
• EN 1092
• ISO 7005

4. Grooved End Connections

For quick installation and connection to grooved piping systems.

• AWWA C606: Grooved and shouldered joints.

5. Butt-Weld Connections

Less common for butterfly valves but occasionally used in specific applications.

• ASME B16.25: Butt-welding ends.
• ISO 9692: Welding preparation standards.

6. Standards for Specialized Applications

• AWWA C504: For waterworks applications, especially large-diameter valves.
• API 609: Butterfly valves for general-purpose applications.
• MSS SP-67: Covers butterfly valves, general-purpose and high-performance types.

Key Considerations

• Always ensure that the valve and mating components meet the same flange drilling patterns and pressure ratings.
• Verify that the material of construction and dimensions meet the system’s operational requirements (temperature, pressure, medium compatibility).

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