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Apparatus and method for regulating pressure in two chambers

  • US 5,913,978 A
  • Filed: 04/12/1996
  • Issued: 06/22/1999
  • Est. Priority Date: 04/20/1995
  • Status: Expired due to Term
First Claim
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1. An apparatus for regulating pressures in first and second chambers which can communicate with each other through an open-close door, whereby the difference in pressure between the chambers is adjusted to approximately zero when the pressure in the second chamber is higher than the pressure in the first chamber, comprising:

  • gas supply means for supplying a gas to the second chamber, thereby raising the pressure in the second chamber to a selected level;

    communication means for internally connecting the first and second chambers; and

    release means for allowing the gas to flow from the second chamber into the first chamber through the communication means when the selected level is attained by the pressure in the second chamber, whereinsaid communication means includes a pipe located in the open-close door between the first and second chambers and internally connecting the chambers.

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