Final answer:
Back seating a suction shut off valve will close off the flow of fluid or gas in a system.
Step-by-step explanation:
Back seating a suction shut off valve will close off the flow of fluid or gas in a system. This is because back seating refers to closing a valve completely, preventing any flow through it.
For example, in a water system, if a suction shut off valve is back seated, it will stop the flow of water from the source to the destination.
The primary topic of this question is the function of a back seated suction shut off valve in controlling the flow of fluid or gas in a system.