Which type of disc globe valve is not recommended for close throttling applications?

• A. Conventional
• B. Reduced bore
• C. Double seated
• D. Pressure balanced

Answer: (A)

In discussing the types of disc globe valves, it's essential to understand their design and intended applications. The conventional disc globe valve is not recommended for close throttling applications primarily due to its design that features a single seat.

When a conventional valve is used for throttling, it can create uneven flow conditions, leading to excessive wear and damage over time. In throttling applications, where precise control of flow is necessary, a valve with a more suitable design is preferred. Such valves are often engineered with features that provide better regulation, such as pressure-balanced or double-seated designs, which help in reducing flow turbulence and cavitation.

In contrast, other types like reduced bore, double-seated, and pressure-balanced valves are specifically designed to handle throttling situations. They offer enhanced flow characteristics and pressure management, making them more appropriate for applications requiring close and sensitive control of fluid flow.