A New Electromagnetic Gas Sampling Valve

Abstract

A new gas sampling valve working at high speed was prepared for the study of the scavenging in a two-stroke engine, and its own performance was examined to obtain the basic data for the future design. This new valve is a kind of an electromagnetic solenoid valve, and it is actuated by passing an instantaneous heavy current into a coil that generates an inverse magnetic field against the fixed magnetic field. The experiments were done to determine the working region of the valve, the time lag of the opening, the duration of valve opening, the volume of the sampled gas, etc. As a result, the time lag for the opening, t_d, was about 0.5∼1.0 milliseconds, the duration of valve opening, t_f, could be obtained for 1∼10 milliseconds and the gas could be sampled at a rate of about 10 cc/m sec under the pressure difference of 1 kg/cm².