The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 1989
Filed:
Aug. 18, 1987
Siegfried Schoenwald, Bad Neustadt/Herschfeld, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
A valve for controlling a pressure differential between a high and low pressure, characterized by a housing being sub-divided by a transfer port into a first and second chamber, each having ports, a valve member movable in the first chamber to close the transfer port, a spring arrangement for urging the valve member to a closing position, a membrane extending across an opening end of the housing, which is in communication with the first chamber and held on by a cap forming a third chamber having a port and means for connecting the valve member to the membrane so that when a pressure differential between the pressure in the first chamber and third chamber exceeds the value of the spring arrangement, the transfer port is open to allow passage of the pressure in the first chamber into the second chamber. The valve can be used in controlling a compressor by allowing the dumping of the output of the compressor when the pressure differential is exceeded and can be used for controlling a vacuum system by dumping ambient air into the vacuum system when the vacuum exceeds a certain amount. In addition, the valve can be utilized for maintaining a pressure differential on a tape loop box of a reel-to-reel magnetic tape recorder.