To limit the probability of delay in reaching and closing the valve in the event of an unwanted release of liquid, which could lead to the escape of liquid not being minimized, which could lead to the spread of liquid, which could lead to the ignition of vapour from a nearby ignition source, which could lead to damage to the building or facility.
To limit the probability of delay in reaching and closing the valve in the event of a fire, which could lead to the escape of liquid not being minimized, which could lead to the spread of the fire, which could lead to damage to the building or facility.