This is the 10385th most frequent Russian word.
валютным
"Valyutnym" means "currency" or "foreign exchange-related."
Here, "валютных" refers to reserves comprising foreign currency, highlighting economic aspects.
Экономика страны зависит от её валютных резервов.
The country's economy depends on its foreign currency reserves.
In this sentence, "валютный" is used to describe the type of rate, specifically the exchange rate, indicating financial changes.
Валютный курс сегодня значительно упал.
The exchange rate dropped significantly today.
"Валютным" modifies "отделе," specifying that the department deals with foreign currency operations.