Have you ever faced the challenge of selecting the right globe valve disc during pipeline system design or operation? When using a globe valve to control fluid flow, the disc type directly affects sealing performance, flow regulation, and suitability for specific conditions. Understanding the types of discs and their applications can help you make faster, more accurate selections and improve overall system efficiency.

Flat / Standard Disc

Features: The disc has a flat sealing surface, simple structure, and relatively low manufacturing cost.

Applications: Commonly used for water, steam, air, and other low-viscosity media. Suitable for medium to low-pressure systems.

Pros & Cons: Provides basic and reliable shutoff, but sealing reliability is moderate. Under long-term high pressure or high temperature, the sealing surface may wear more quickly.

Conical / Tapered Disc

Features: The disc is conical in shape, matching the sealing surface of the valve seat with a smaller contact area.

Applications: Ideal for high-pressure conditions or systems requiring precise shutoff, such as steam and oil pipelines.

Pros & Cons: Offers excellent sealing performance, but requires greater operating torque for opening and closing.

Plug / Concave Disc

Features: The disc surface is slightly convex, forming point contact with the valve seat, offering high sealing precision.

Applications: Suitable for gases, liquids, and some corrosive media, allowing effective flow regulation.

Pros & Cons: Manufacturing cost is higher, but sealing performance and wear resistance are superior to flat discs.

Double Disc

Features: A large disc contains a smaller inner disc.

Applications: Commonly used in high-pressure, large-diameter valves. It helps balance pressure and extend valve service life.

Pros & Cons: Structurally more complex and more expensive, but ideal for high-pressure, large-diameter applications.

Conclusion

Globe valve discs come in a variety of types, each with unique advantages and suitable working conditions. When selecting a disc, consider the medium type, pressure, temperature, and flow requirements. Choosing the correct disc ensures reliable system sealing, extends valve life, and reduces maintenance costs.