| 摘要 |
A combination pressure and vacuum relief vent apparatus which accurately and reliably provides both high flow rates of pressure relief and negative pressure or vacuum relief in a container, the apparatus comprising a base member having a passageway extending between opposite ends thereof, one end of which base member can be mounted on or over an orifice on a container, a shaft member located in the passagway of the base member and a combination valve assembly mounted on the shaft member adjacent to the opposite or free end of the body member, which combination valve assembly opens to provide high flow rates of pressure relief at a precise predetermined first set pressure and closes when the pressure falls below substantially the same or a lower set value and which combination valve assembly includes a vacuum valve member which moves along the shaft member away from the combination valve assembly in response to the pressure in the container decreasing or falling below a second predetermined pressure condition to allow ambient air to enter the container therebetween, and a seal member located on the shaft member adjacent to the vacuum valve member which forms a seal therebetween.
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