The use of lubricating oil, semi liquid grease and up to NLGI 2 grease Double lubricating system components and Lincoln SKF grease lubricating system can be used for large-scale equipment has many scattered points and each lubricating point of the lubrication lubricant demand different. The system is equipped with two main lines, using a pressure up to 400 bar (5800 psi) of the high-pressure pump through the reversing valve to supply lubricant. Along the main line of the branch line and double line distribution valve connected to the lubrication point to provide a large number of lubricants. In the large double line lubrication system, the function of the tail pressure switch is the monitoring system.