Why can't the drain valve of Suzuki uu oil-water separator open for a long time?

The long-term meeting of the drain valve of Suzuki uu oil-water separator led to carbon deposition in the valve. According to the relevant public information, the meeting of the long bleed valve of Suzuki uu oil-water separator caused carbon deposition in the valve, which affected the abnormal phenomena such as difficult start-up, unstable idle speed, poor acceleration, quick flashback during refueling, excessive exhaust volume and increased fuel consumption, and even affected the engine damage in severe cases.