Pumping Device for Sucking or Draining Fluid
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United States of America Patent
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Issued Date -
Sep 18, 2014
app pub date -
Mar 13, 2013
filing date -
Mar 13, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A pumping device includes a seal cap unit including a cap, an air relief member connected with the cap, and a regulating member connected with the air relief member. The cap has an air inlet hole and an air outlet hole. The air outlet hole has a through hole. The air relief member is mounted on the air outlet hole and has a guide hole and a plurality of apertures. The regulating member has an air relief hole and a plurality of draining holes. Thus, the air relief hole of the regulating member and the pressure relief member provide a double pressure relief function to release the excessive air pressure in the barrel.
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