Where are the shut-off valves CDL?
When pulling doubles or triples the shut off valve should always be?
Why must air tanks be drained?
When the handle of a ball valve is parallel to the valve or pipe, it’s open. When it’s perpendicular, it’s closed.
All shut-off valves on the rear most trailer should always be in the closed position. When pulling two or more trailers, the shut off valves on the first trailer should be in the following positions: The service line should be closed and the emergency line should be open.
All shut-off valves should be in the open position, except the rear shut-off valves.
Which shut off valves should be open and which shut off valves should be closed?
Quote From The CDL Manual: Shut-off valves (also called “cut-out cocks”) are used in the service and supply air lines at the back of trailers used to tow other trailers.
