Progressive Lubrication System
Description of the system:
Progressive distributors are piston distributors, which separate the lubricant fed along the main line to the various outlets. The pistons of the metering elements are moved in a specified order. This movement causes the pistons to displace lubricant, which is pumped through an outlet to the lubrication point. The order of lubricant assignment is specified. Should a distributor remain in a certain position (system switched off, line pressure too high, storage tank empty etc.), then the allocation of lubricant continues at the same position at which it was interrupted when the system restarts.
The distributors in this system work on the basis of forced control. This means that in a complete distributor circuit all the outlets are supplied with the specified volume of lubricant. The forced control of the metering pistons means that there is safe functional control just by monitoring one piston.
- Minimal pressure loss (start-up pressure)
- Cost-effective monitoring
- Large varying lubricant volume ratios are possible between the outlets
- Thin oils, liquid grease and grease up to NLGI class 2
- Pressure up to 350 bar
- Precise metering
The lubricant flows from the main line through the right-hand ring groove of piston III and the bypass line (right) to the left side of piston I and moves it to its right-hand end position. When piston I moves, it displaces the lubricant located in the right-hand metering chamber and transports it via the left-hand bypass line to outlet 6.
Once piston I has shifted, the ring groove highlighted in the adjacent figures becomes free. This now allows the lubricant to flow to the left-hand side of piston II and moves it to its right-hand end position. The lubricant displaced by this escapes through outlet 1.
Once piston II has moved, lubricant now flows through the left-hand ring groove of piston II to the left side of piston III and moves this to its right-hand end position. The lubricant displaced emerges through outlet 2.
Once piston III has moved, lubricant now flows through the left-hand bypass line to the right side of piston I and moves it to its left-hand end position. The lubricant displaced escapes through the right-hand bypass line through outlet 3. The process continues as shown on the diagram.
WOERNER progressive distributors can be sub-divided according to:
- Element design (VPI)
- Plate design (VPA)
- Block design (VPB)
Supply of distributors:
Multi-line pumps, among others, can be used to supply the progressive distributors with the required feed volume, and are often referred to in the literature for this application as progressive pumps.
These pumps are designed to meet various requirements, such as the volume to be pumped and requisite pressure. The volume needs to be high enough to supply the lubrication points and the pressure needs to be high enough to overcome resistance in the pipework and friction in the distributor.