What special device controls the air to the trip cocks on certain work motors?

The special device that controls the air to the trip cocks on certain work motors is a diverting valve. This type of valve is specifically designed to direct or divert air flow within a pneumatic system. In the context of train operations, the diverting valve functions to manage the air supply to the trip cocks, which are essential safety devices that halt the operation of the train under certain conditions. By correctly directing the air flow, the diverting valve ensures that the trip cocks can engage as needed to promote safe operation.

In contrast, a pressure regulator is used to maintain a specific pressure in a system, a flow control valve adjusts the rate of fluid flow, and a pneumatic switch typically serves to turn on or off components within a pneumatic system but does not control air flow in the same manner as a diverting valve. Thus, the role of the diverting valve is critical in successfully managing air pressure to the trip cocks effectively.