Final answer:
Non-indicating type gate valves are known as blind valves. They lack visual indicators for gate position or flow status, and the valve position is often verified by other means.
Step-by-step explanation:
Gate valves of the non-indicating type are typically called blind valves.
Gate valves are a common type of valve used in various industrial applications for controlling the flow of liquids, gases, and slurries. Non-indicating gate valves, also known as blind valves, do not have a visual indicator to show the position of the gate or the flow status through the valve. This is in contrast to indicating gate valves, which have a mechanism to show whether the valve is open or closed. In many applications, the valve position must be verified by other means, such as by checking the system pressure or flow downstream.