Patent ID: 7857248

Claim:
A crushing apparatus, comprising: a gyratory crusher having a crushing head, which supports a first crushing surface, a second crushing surface, which surrounds the first crushing surface, and an eccentric, which is arranged to cause the crushing head to execute a gyratory movement; a lubricating system, which is arranged to supply a lubricant for lubrication of at least one movable part of the gyratory crusher, wherein the lubricating system comprises an oil sump, which is arranged to collect the lubricant after it has been used for lubrication of the at least one movable part, and a valve mechanism, which is arranged to apportion a lubricant flow in the crusher, the valve mechanism being arranged to assume a first position, in which a first sub-volume of the lubricant flow is conducted to the at least one movable part for lubrication of the at least one movable part and a second sub-volume of the lubricant flow is conducted directly to the oil sump, the second sub-volume constituting from about 30 to about 100% of the lubricant flow and the first sub-volume amounting to the remaining part, if any, of the lubricant flow and a second position, in which at least about 90% of the lubricant flow is conducted to the at least one movable part for lubrication of the same.