Nexoil - Progressive Distributors

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Progressive Block Data Sheet

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Progressive System Operation

Progressive System Operation

This system uses a single lubricant distribution line and allows complete control of the system using a single device that can be installed in any of the metering elements.

A progressive metering device operates as follows (see figure); the pressurised lubricant coming from the pump enters the set of progressive metering elements (consisting of a minimum of three elements) and, through the internal delivery duct, reaches the right hand position of piston 1 pushing this leftwards. This movement causes the supply through outlet D1 that has been accumulated in the left hand metering chamber of the first element.

At the same time, the passage allowing the lubricant to arrive from the line to activate piston 2, moving this leftwards, is opened. In addition to the supply of lubricant from outlet S2, the movement of this piston opens the passageway that allows piston 3 to perform the same operation with supply of lubricant from outlet S3 and opening the passageway allows the pressurised lubricant to travel to the left hand part of piston 1.

The other two pistons that complete the lubrication cycle will be moved in sequence. As the movement of a piston is necessary to activate the next piston, all the progressive metering elements of a system are connected in series. Therefore, the blocking of any of the pistons of the metering elements, even those of another set, automatically blocks the whole system. This characteristic is very important for the control of a centralised system. The entire system can be controlled by monitoring any outlet of a metering element with a microswitch or magnetic reed or, even better, with an inductive sensor.


Progressive System Operation
Diagram of an oil lubrication system equipped with a motorised gear pump (model 6027 series) with an output of 500cm3/min at a pressure 0f 70 bar (1015psi)

Progressive System Operation
Diagram of an oil lubrication system equipped with an electric pump (model 6015 series) with an output of 130cm3/min at a pressure 0f 350 bar (50755psi)

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