| 摘要 |
A VACUUM VALVE DEVICE INCLUDES AN EJECTOR DIE BLOCK (21) AND A COVER DIE BLOCK (31) MATE WITH EACH OTHER TO FORM FEED-SIDE PASSAGEWAY (50) ALLOWING FLOW-IN OF A MOLTEN CASTING MATERIAL, AND A SUCTION-SIDE PASSAGEWAY (60) OPPOSITE TO THE FEED-SIDE PASSAGEWAY (60) OPPOSITE TO THE FEED-SIDE PASSAGEWAY (50) IN A FLOWING DIRECTION, AND AN EJECTOR VENT BLOCK (41) MOVABLY DISPOSED IN A CONCAVED EJECTOR REGION (211) OF THE EJECTOR DIE BLOCK (21) IN THE FLOWING DIRECTION. THE EJECTOR VENT BLOCK (41) AND THE COVER DIE BLOCK (31) ARE MATED WITH EACH OTHER TO FORM A VENT PASSAGEWAY (??) WITH A PLURALITY OF ALTERNATE PRESSURE IMPARTING SEGMENTS (70) AND VALVE PORT SEGMENTS (80) SUCH THAT BY THE FLOW PRESSURE OF MOLTEN CASTING MATERIAL AT THE PRESSURE IMPARTING SEGMENTS (70) TO MOVE THE EJECTOR VENT BLOCK (41), THE VALVE PORT SEGMENTS (80) ARE CLOSED TO STANCH OFF FLOW OF THE MOLTEN CASTING MATERIAL. (THE MOST ILLUSTRATIVE DRAWING IS |
