You'll say or write "Over-Pressure Shut-Off Vale" once, and then context now makes it possible to say "valve" for instances after. Unless you're discussing seve

You'll say or write "Over-Pressure Shut-Off Vale" once, and then context now makes it possible to say "valve" for instances after. Unless you're discussing several valves at one, why does one need to use whatever acronym (with more syllables than the word 'valve')?