| 摘要 |
An emergency valve assembly for a tank adapted to contain liquid such as for instance hazardous material, with the valve assembly including a valve head for closing the discharge port from the tank in an operative closed position of the valve head, and with a first operating unit coacting with the valve head for selectively opening the latter and a separate second operating unit coacting with the valve head for automatically closing the latter. The first operating unit has a portion adapted for accessibility from exteriorly of the tank and includes a fluid power connection to the first operating unit, for selectively supplying pressurized fluid to such operating unit; for causing opening of the valve head via such operating unit upon application of pressurized fluid thereto. The arrangement is such that the valve assembly including both operating units may be readily disassembled for cleaning and inspection and then reassembled with the tank, and with the valve assembly being structurally reliable for handling the liquid contents of the tank.
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