Question 162Steam Plants - 1st Asst/Chief

The correct answer is D) root valve. The valve located between the fuel oil header and the burner valve is known as the root valve. This valve controls the flow of fuel oil from the header to the burner, and is a critical component in the fuel oil supply system. The root valve allows the operator to isolate the burner from the fuel oil header, which is necessary for maintenance, inspection, or in case of an emergency. The other answer choices are incorrect because they do not accurately describe the valve in question. The return valve is used to recirculate excess fuel oil back to the fuel oil supply, the register valve is used to control the air-fuel mixture, and the header valve would be located upstream of the fuel oil header, not between the header and the burner.