11
B-doser groups, Heavy-system
General description
Note Numbers in brackets are part numbers of drawings 461780 in the page 16.
A doser group consists of a mounting rail (pos. 1) and one or several dosers (pos. 2) fas-
tened to it. The mounting rail divides the lubricant to the dosers, which feed the adjusted
amount of lubricant to the lubrication points.
Design
The doser includes a charging valve (pos. 3), a dosing chamber (pos. 4), a dosing piston
(pos. 5) and a spring (pos. 6). B6 doser is equipped with a dosage adjustment screw (pos. 7).
Operation
B-doser
The pressure in the line increases during pressurization and the doser charging valve moves
to its upper position. At the same time lubricant flows past the charging valve and moves the
dosing piston to its upper position. When the dosing piston moves to its upper position, it
pushes the adjusted lubricant dosage from the dosing chamber to the lubrication point.
After pressurization the line pressure decreases and the charging valve moves to its lower
position and closes. The spring returns the dosing piston to its lower position and at the
same time lubricant flows above the dosing piston to the dosing chamber.
The line can be pressurized again when the pressure in the line has decreased and the dos-
ing pistons of the dosers have returned to the lower position.
The unfastening and fastening of dosers
The dosers are unfastened and fastened with a socket wrench.
Caution When changing the dosers, make sure that there is no pressure in the sys-
tem.
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