What is the term for opening a discharge just enough to deliver the desired pressure when operating multiple lines with different required pressures?

The term for opening a discharge just enough to deliver the desired pressure when operating multiple lines with different required pressures is known as gating a valve. This practice involves adjusting the position of the valve to control the flow rather than fully opening or closing it. By carefully gating a valve, the operator can achieve the necessary water pressure for various hose lines, ensuring that each line receives the correct amount of water pressure based on its specific requirements.

This technique is essential in firefighting operations where multiple hoses may be in use simultaneously, each potentially having different nozzle pressures or demands. Ensuring that the correct pressures are maintained not only improves operational effectiveness but also enhances safety for the firefighters operating the lines.

Other options like adjusting a nozzle, regulating flow, or setting a hydrant do not specifically refer to the precise action of controlling valve discharge to achieve a desired pressure when multiple lines are in use. Adjusting a nozzle pertains to manipulating the design and settings of the nozzle itself to impact flow and pressure at the outlet, regulating flow generally refers to controlling flow in a broader context, and setting a hydrant refers to opening and preparing a fire hydrant for use, which is separate from ongoing pressure management in the system.