Patent ID: 6514058
Filing Date: 2003-02-04
Classification: F04B

Abstract:
A valved piston device for a compressor, said valved piston device comprising:a) a housing including a chamber formed therein, b) a piston slidably received in said chamber of said housing, said piston including an outer peripheral portion having an annular groove formed therein and defined by an inclined inner peripheral surface, and including an upper portion having a plurality of openings formed therein and communicating with said annular groove of said piston, and c) a sealing ring received in said annular groove of said piston, said inclined inner peripheral surface of said piston including a lower portion having a diameter greater than that of said sealing ring for forming a lower portion of said annular groove of said piston and for forcing said sealing ring to engage with said housing, and including an upper portion having a diameter less than that of said sealing ring for forming an upper portion of said annular groove of said piston and for loosely receiving said sealing ring in said upper portion of said annular groove of said piston, said openings of said piston being communicating with said annular groove of said piston and being communicating with said chamber of said housing when said sealing ring is loosely received in said upper portion of said annular groove of said piston.