B47 Crusher Keyword:paving breaker,pneumatic rock crusher,pneumatic road breaking tools;stone crushing machine Product Introduction The paving breaker model B47 is tools with compressed air as its power. The compressed air is distributed alternatively through the distributing valve into either end of the cylinder assembly so that the hammer inside is made to carry on a reciprocal motion which impacts the shank of the steel chisel by the tappet drives the chisel into the