Patent ID: 7351044
Filing Date: 2008-04-01
Classification: F04B,F05C

Abstract:
1. A multistage piston compressor comprising a valve casing ( 4 ) and a shiftable valve piston ( 9 ) formed as a single piece and driven linearly oscillating by a drive motor ( 2 ), wherein the valve piston ( 9 ) is furnished with a low pressure piston ( 10 ) and with a high pressure piston ( 12 ), wherein the low pressure piston ( 10 ) and the high pressure piston ( 11 ) form at least one volume changeable low-pressure chamber ( 5 ) with the intake check valve ( 15 ) and with at least one volume changeable high-pressure chamber ( 6 ) with the discharge check valve ( 30 ), and wherein the low-pressure chamber ( 5 ) and the high-pressure chamber ( 6 ) are connected to each other through an overflow duct ( 19 ), wherein an overflow check valve ( 20 ) opening in the direction toward the high-pressure chamber ( 6 ) is inserted in the overflow duct ( 19 ), wherein the overflow check valve ( wherein the overflow duct ( wherein the passage bore holes ( wherein the passage bore holes (