Sluice gate for a hydropower station

A sluice gate for a hydropower station, the sluice gate comprising:

• rollers configured to move the sluice gate by moving along rails;
• a sealing surface having a seal with which an upstream water can be sealed off from a downstream water;
• lubricant lines configured to feed lubricant to the rollers;
• and
• lubricant return lines connected to the rollers and configured to guide used lubricant through the lubricant return lines from the rollers to one or more collection locations in order to be able to collect and properly dispose of the used lubricant,
• wherein the rollers are arranged in multiple rows,
• the lubricant return lines for the multiple rows are connected to a shared lubricant return collection line,
• the shared lubricant return collection line has a diameter that is equal to at least five times a diameter of each of the lubricant return lines,
• multiple lubricant lines, of the lubricant lines, are arranged, at least in regions, in a channel together with at least the shared lubricant return collection line, and
• the channel includes closable openings, at an upper end, through which fresh lubricant can be fed and the used lubricant can be removed.