What are gate valves of the non-indicating type commonly referred to as?

Gate valves of the non-indicating type are commonly referred to as curb valves. This terminology arises from their typical application, which is often found in buried or outdoor installations, such as those used for controlling the water supply to sprinkler systems or other outdoor plumbing services. Curb valves are specifically designed to provide shut-off capabilities; they are used to control the flow of water and isolate sections of a system without indicating whether the valve is open or closed, hence the term "non-indicating."

These types of valves are typically used in municipal water distribution systems and allow for maintenance work or emergencies to be addressed efficiently without disrupting the overall water supply. Their construction enables a full flow when open, minimizing pressure loss in the system.

Other terms like shut-off valves might apply more broadly to any valve that stops the flow of water, but they do not capture the specific function or context of curb valves. Control valves are used to regulate flow or pressure, and flow valves typically refer to devices that manage the direction and quantity of fluid flow in a more dynamic sense. Curb valves are distinct in their function and designation within the context of sprinkler systems and municipal water control.