Final answer:
The deadman control valve on the Type V hydrant system is operated by a person holding down a button or switch. This valve is a safety feature that ensures the flow of fuel is cut off if the operator releases the switch or button.
Step-by-step explanation:
The deadman control valve on the Type V hydrant system is operated by a person holding down a button or switch. This valve is designed to ensure that the flow of fuel is cut off if the operator releasing the switch or button for any reason. The deadman control valve is a safety feature that helps prevent accidents and spills.