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Class 417/433 - Liquid pool seal for gas pump valve


Subclass of Class 417 - Pumps
Definition: Apparatus in which the fluid pumped is a gas and a body
No. of patents: 2
Last issue date: 08/15/2000


NumberTitleIssue Date
6102680Suction valve with release timing chamber
In addition to seating on its valve seat during the combined compression and discharge stroke, the suction valve seats on the structure associated with the valve seat which has at least one shallow recessed area. In seating on its valve seat, the suction ...
08/15/2000
5358389Two-stage compression vacuum pump having valved piston and power limiting valve
This invention relates to a vacuum pump. The pump includes a pump housing (10) having upper and lower cylindrical, partly liquid filled, compression chambers (11 and 12 respectively) which are separated from each other and in which an upper and a lower pa...
10/25/1994
 
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