Lubrication system for tool

摘要

A lubrication system (200) for a tool (112) powered by a drive fluid is provided. The lubrication system (200) includes a reservoir (230) configured to deliver a lubricant (304) and a plunger (302) disposed within the reservoir (230). The plunger (302) is configured to selectively generate a pilot signal (244) based on a level of the lubricant (304). The lubrication system (200) further includes a valve (234) having a housing (306). The housing (306) includes a drive fluid inlet (236) and a drive fluid outlet (1002). The valve (234) also includes a pilot spool (314) configured to move from a neutral position to an actuated position in response to the pilot signal (244). The valve (234) further includes a main spool (328) selectively actuated by a pressure of the drive fluid to move from a first position to a second position in response to the movement of the pilot spool (314) such that in the second position the drive fluid inlet (236) is in fluid communication with the drive fluid outlet (1002).