• Vehicle loads are discharged with low noise levels and engine speeds to minimize dust nuisance (see performance graph)
• A hydraulic pump with a compact drive arrangement is available for vehicles having a single power take-off aperture or a limited power gearbox, and also for direct coupled power packs
• The blower can be operated with a longitudinal inclination of up to 10° without risk of oil starvation: this is of particular importance when the vehicle is not standing on level ground
• There are no wear tips or inserts on the impellers which need to be bedded in after installation, and which might subsequently become detached or damaged causing the vehicle load to become contaminated by foreign matter. Air gaps at each end of the cylinder ensure that there can be no contamination by oil or oil vapours
• Centre timing permits operation in either direction – vertical or horizontal air flow; Suitable for combined pressure and exhauster applications with vacuum up to 475 mbar
• All machines are given a works overload test from cold to prove their reliability

Engineering resources: 
Performance graph: rbtm_graph_performance_metric.pdf,
Dimension drawings: rbtm_drwg_dim_metric.pdf

Two figure-eight lobe impellers mounted on parallel shafts rotate in opposite directions. As each impeller passes the blower inlet, it traps a finite volume of air and carries it around the case to the blower outlet, where the air is discharged. With constant speed operation the displaced volume is essentially the same regardless of pressure, temperature or barometric pressure. Timing gears control the relative position of the impellers to each other and maintain small, but defined, clearances. This allows operation without lubrication being required inside the air casing.

rotary_lobe_blwr_princ.pdf