Which of the following is NOT a type of joint used for valve installation?

The correct choice identifies "Actuator Joint" as not being a type of joint used specifically for valve installation. In the context of water distribution systems, welded, flanged, and screwed joints are common methods for connecting pipes and valves.

Welded joints provide a strong, permanent connection that is typically used in situations where leakage must be absolutely minimized. Flanged joints allow for easy disassembly and maintenance, making them ideal for valve installations where frequent access might be necessary. Screwed joints offer a straightforward method of assembly and disassembly, appealing for certain valve scenarios, especially in smaller installations.

In contrast, an actuator joint is more of a term related to the component that operates the valve rather than the method of physical connection. Actuators are devices that control the opening and closing of valves but do not refer to a connection technique itself. Therefore, recognizing that an actuator joint is not a standard method for installing valves clarifies why it is the correct selection in this scenario.