What is the purpose of the needle valve installed on an auxiliary turbine?

The purpose of the needle valve installed on an auxiliary turbine is primarily to control the flow of fluid, especially in applications where precise flow adjustments are necessary. These valves are designed to provide fine control by allowing for very small adjustments to the flow rate, which is critical in turbine operation where maintaining optimal performance is essential.

While the options include various roles such as regulating steam pressure and preventing backflow, the key function of the needle valve is specifically linked to its capability to modulate flow in a controlled manner. This precision ensures that the auxiliary turbine operates efficiently and safely under varying operational conditions, making it an integral component in the system.

Understanding this function is vital for machinist mates, as managing fluid dynamics directly influences the overall performance and reliability of turbine systems.