This study describes the improvement of the reliability and effectiveness of the straight flow used in piston compressors, valves, and by modeling the flow of gas and the movement of plate valve. This model distributes the gas pressure and distortions plate valve as a flexible plate to be determined. This modeling test gas flow through the valve in the static measurements in addition to dynamic measurements of the end plate valve movement in the compressor has checksum where the comparison between numerical results and experimental results measured.