| 摘要 |
Blasting system for particles, e.g., air blast of fine abrasive particles, having an non-clogging feed device and a reliable, long-lasting on-off valve system acting upon a resilient hose. The feed device features: hourglass type particle metering into an air stream; countercurrent air percolation from air conduit through the particle metering orifice; and air turbulence at the orifice in a constant diameter region of the conduit. The valve member features: a ball member pressed against a resilient passage toward a pair of opposing ball members; adjustment devices for adjusting initial depression of each of the pair of ball members into the hose; air pressure actuation of the one ball member; and actuation increasing the depression of each of the pair of ball members to urge the respective resilient wall portion into conformity with the opposite wall of the conduit and reverse depression effect at the central ball member, cooperating to choke off the flow. A removable metering member defining the hourglass configuration orifice and transverse air passage permits replacement of the most active, hence wear-exposed, portion of the system.
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