Types And Differences Of CGA, GB, DIN, And BSP Cylinder Fittings

Types and Differences of CGA, GB, DIN, and BSP Cylinder Fittings of VIGOUR

Gas cylinder fittings vary depending on the country, gas type, and safety standards.

Understanding the differences between CGA, GB, DIN, and BSP fittings is crucial when selecting the appropriate regulators, valves, or gas systems, especially in international projects.

一.CGA (Compressed Gas Association - USA)

1.Country/Region: United States, Canada

2.Thread Type: Varies depending on CGA number; generally NPT or special gas-specific threads

3.Features:

1)CGA fittings are assigned numbers (e.g., CGA 320 for CO₂, CGA 580 for inert gases).

2)Each gas has a unique CGA number to prevent mismatching.

3)Not interchangeable with DIN or GB fittings.

4.Application: Widely used in North America for industrial, medical, and specialty gases.

二.GB (Guobiao - China National Standard)

1.Country/Region: China

2.Thread Type: Usually G-thread (BSP parallel) or metric threads

3.Features:

1)Regulated under Chinese national standards (e.g., GB/T 8335, GB/T 11637).

2)Common in domestic Chinese gas systems and equipment.

3)May require adapters when connecting to CGA or DIN fittings.

4.Application: Industrial gas supply, laboratories, and general manufacturing in China.

三.DIN (Deutsches Institut für Normung - Germany)

1.Country/Region: Germany and parts of Europe

2.Thread Type: Metric threads, often DIN 477 standards

3.Features:

1)DIN 477 defines cylinder valve connections for various gases.

2)Each gas has a corresponding Part Number (e.g., DIN 477-1 for oxygen).

3)High precision, suitable for high-purity applications.

4.Application: Scientific research, medical gas, semiconductor industry, European market.

四. BSP (British Standard Pipe)

1.Country/Region: UK, Commonwealth countries, international

2.Thread Type: BSPP (parallel) or BSPT (tapered)

3.Features:

1)Used for both gas and liquid piping connections.

2)Not gas-specific like CGA or DIN, so care must be taken when selecting.

3)BSP is often used in conjunction with other systems in global equipment.

4.Application: General industrial piping, some gas panels or valve ports.

五. Summary Table of Differences

六.Adapter Use and Safety Note:

When connecting components from different standards, thread compatibility is critical.

Using mismatched threads can cause gas leaks or system failure. VIGOUR offers customized cylinder adapters and transition fittings to ensure compatibility across CGA, GB, DIN, and BSP systems.