Which two types of globe valves are recognized based on seat arrangements?

The correct answer identifies two types of globe valves based on their seat arrangements: needle valve and plug disc.

Globe valves are characterized by their spherical body shape which contains an internal baffle that creates a variable flow path. In terms of seat arrangements, globe valves can be designed with different types of seat surfaces to control the flow effectively.

A needle valve features a long, tapered packing that allows for precise control of flow rates, making it particularly suitable for applications requiring fine adjustments. The nature of the needle valve's design, with a small orifice and specialized seat arrangement, facilitates this level of precision.

On the other hand, a plug disc valve can use a plug with a disc-like configuration that seals against the seat. This design enables effective throttling and shut-off capabilities. The arrangement of the seat in a plug disc valve aligns with the classic function of globe valves, which is to direct flow and control pressure.

In contrast, the other options do not specifically relate to globe valves or do not focus on the concept of seat arrangements in the same way. Ball valves and butterfly valves, for example, use entirely different operational principles and designs, mainly revolving around quarter-turn operations rather than the nuanced flow control typical of globe valves. Similarly, gate valves