The following is a summary of the diameter range of butterfly valves with different connection methods and structural types, based on common industry standards and application practices. Since the specific diameter range may vary depending on the manufacturer and application scenario (such as pressure level, medium type, etc.), this article provides data for zfa valves.
The following is general reference data in nominal diameter (DN, mm).
1. Diameter range of butterfly valves classified by connection method
1. Wafer butterfly valve
- Diameter range: DN15–DN600
- Description: Wafer butterfly valves are compact in structure and are often used in medium and low pressure systems. They have a wide diameter range and are suitable for small and medium-sized pipelines. If it exceeds DN600, you can choose a single flange butterfly valve (DN700-DN1000). Extra large diameters (such as above DN1200) are rare because of high installation and sealing requirements.
2. Double flange butterfly valve
- Diameter range: DN50–DN3000
- Description: Double flange butterfly valve is suitable for occasions that require higher structural stability and sealing performance. It has a larger diameter range and is often used in large pipeline systems such as water treatment, power stations, etc.
3. Single flange butterfly valve
- Diameter range: DN700–DN1000
- Description: Single flange valves consume less materials than double flange or lug valves, which reduces manufacturing costs and also reduces transportation costs. It is bolted to the pipe flange and clamped in place.
4. Lug butterfly valve
- Diameter range: DN50–DN600
- Description: Lug butterfly valves (Lug type) are suitable for systems at the end of the pipeline or that require frequent disassembly. The diameter range is small and medium. Due to structural limitations, large diameter applications are less common.
5. U-type butterfly valve
- Caliber range: DN100–DN1800
- Description: U-type butterfly valves are mostly used for large-diameter pipelines, such as municipal water supply, sewage treatment, etc., and the structure is suitable for high flow and low pressure difference scenarios.
| Description | Common Size Range (DN) | Key Notes |
|---|---|---|
| Water Butterfly Valve | DN15-DN600 | Compact structure, cost-effective, widely used in low-to medium-pressure systems; larger sizes for non-critical services. |
| Lug Butterfly Valve | DN50-DN600 | Suitable for dead-end service and systems requiring disassembly from one side. Slightly better pressure handling than water type. |
| Single-Flanged Butterfly Valve | DN700-DN1000 | Common in buried or low-pressure systems; lighter weight and easy to install. |
| Double-Flanged Butterfly Valve | DN50-DN3000(up to DN4000 in some cases) | Suitable for high-pressure, large-diameter, and critical applications; excellent sealing performance. |
| U-type Butterfly Valve | DN50-DN1800 | Typically rubber-lined or fully-lined for corrosion resistance in chemical services. |
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2. Caliber range of butterfly valves classified by structural type
1. Centerline butterfly valve
- Caliber range: DN50–DN1200
- Description: Centerline butterfly valve (soft seal or elastic seal) has a simple structure, suitable for low-pressure and normal temperature media, moderate caliber range, and is widely used in water, gas and other systems.
2. Double eccentric butterfly valve
- Caliber range: DN50–DN1800
- Description: Double eccentric butterfly valve reduces seal wear through eccentric design, is suitable for low and medium pressure systems, has a wide caliber range, and is commonly used in oil and gas, chemical and other industries.
3. Triple eccentric butterfly valve
- Caliber range: DN100–DN3000
- Description: Triple eccentric butterfly valve (hard seal) is suitable for high temperature, high pressure and harsh working conditions. It has a large caliber range and is often used in large industrial pipelines, such as power, petrochemical, etc.
| Description | Common Size Range | Key Notes |
|---|---|---|
| Concentric Butterfly Valve | DN40-DN1200 (up to DN2000 in some cases) | Stem and disc centerlines are alignent soft-seated suitable for low pressure, general applications. |
| Double Offset Butterfly Valve | DN100-DN2000 (up to DN3000) | Disc quickly disengages from seat on opening to reduce wear, used in medium-pressure conditions. |
| Triple Offset Butterfly Valve | DN100-DN3000 (up to DN4000) | Designed for hightemp, high-pressure, zero-leakage applications, usually metal-seated. |
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