Patent ID: 7117783
Filing Date: 2006-10-10
Classification: F04B,F16J

Abstract:
1. A reciprocable piston comprises: (a) a cylindrical body reciprocable within a hollow cylinder, said cylindrical body dividing said hollow cylinder into a first cylinder chamber and a second cylinder chamber; (b) at least two spaced ring seals disposed around the circumference of said cylindrical body; and (c) a scavenging system disposed within said cylindrical body, said scavenging system comprising: an internal chamber in fluid communication with a space between said spaced ring seals, wherein a fluid that originates from said first cylinder chamber that leaks by one of said spaced ring seals is receivable into said internal chamber and said internal chamber defines a volume that is fillable with said fluid that is variable in size; and a one-way fluid passage through which said fluid is flowable from said internal chamber to said first cylinder chamber, when fluid pressure within said internal chamber is greater than fluid pressure within said first cylinder chamber.