Which valve is first off the receiver when installed in an opening with a dip tube?

In systems that incorporate a dip tube, the king valve is designed to be the first valve off the receiver. This is primarily due to its function as a shut-off valve that can effectively isolate the receiver from the rest of the system. The king valve allows safe and efficient maintenance or inspection operations without draining the entire system.

The presence of the dip tube suggests that piping is configured to draw liquid from a specific depth within the receiver, and the king valve is positioned in a way that ensures this liquid can be shut off easily. By having the king valve at this location, operators can control the flow directly from the receiver and manage pressure and safety concerns effectively.

In contrast, other valve types, such as gate valves, globe valves, and check valves, serve different purposes. Gate valves are primarily used for on/off service with minimal pressure drop, globe valves provide throttling capabilities, and check valves are implemented to prevent backflow. While these valves function crucially in their respective roles, they do not serve the specific purpose of being first off the receiver in a setup involving a dip tube, which is why the king valve is the ideal choice.