The conventional disc globe valve is known to be what in terms of cost and service?

The conventional disc globe valve is recognized for being cost-effective and widely used in various applications. This popularity stems from its relatively simple design, which allows for effective regulation of flow and easy maintenance. Being considered "cheap" refers to the affordability of these valves compared to more complex or specialized types of valves, enabling a balance between performance and budget.

Additionally, the straightforward construction and commonality of materials used in globe valves lead to their widespread adoption in numerous industries, solidifying their reputation as a reliable option. While some other types of valves may have specific advantages in niche applications, the globe valve remains a first choice for many engineers and technicians due to its favorable cost-to-service ratio.