Description
Proportional lubrication equipment has been developed for use on machinery installations where a comparatively small number of points are to be lubricated using light to medium oils at low pressure. The oil is distributed on a purely proportional basis with the amount delivered to each lubrication point depending on the pump output and the flow rate from the restrictor selected. There are two types of flow restrictors valves available. METERING, with non return valve for use with cyclic total loss systems, and CONTROL for use on continuous systems.
System Design & Selection of Meter Valves
Whereas the ideal layout for a Proportional System would have equal lengths of tubing at every point, this is rarely possible to achieve and so a selection of metering valves (restrictors) are available to serve the various lubrication point requirements.
The variation of flow restriction of the small bore pipe-work (typically 4mm O/D) can generally be ignored, providing that the viscosity of the oil does not exceed 100 cSt @ 40°C or that the pipe runs are not excessive. When the layout has been determined, and the position of the pump established, the correct pump must be chosen.
This depends entirely on the amount of oil delivery required per pump operation, allowing 5% extra for system losses due to nylon tube expansion. Bear in mind that it is the pump output that determines the total volume of oil which is distributed around the system by means of the meter valves or control units – hence the name Proportional. The selection of the meter valves to suit a particular bearing size is based on the ability of the meter valve flow rate to pass sufficient oil to lubricate the bearing in the ‘cycle time’ of the pump. A bearing with twice the oil requirement would need a meter valve of the next size up on the flow rate chart. Always check that the total value for flow rates of meter valves does not exceed the pump output.
Authorized Distributor – Singapore
Download the catelogue here!
