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the cylinder (known as Bottom Dead Centre or BDC) the exhaust valve starts to open. As the piston now moves up the cylinder, the hot gases (consisting mostly of nitrogen, carbon dioxide, water vapour and unused oxygen) are expelled from the cylinder. As the Piston approaches TDC again the inlet valve starts to open and the cycle repeats itself.
Pressure ( used in blast cabinets, blast rooms, and outdoor blasting) SUCTION blasting uses the venture principle sucking media from a hopper. The air jet. is 1/2 the ID of the nozzle and as the air stream is passed through both, it creates a low. pressure which sucks the media from the hopper into the air stream.