Abstract: The influence of the distance that the iron core moves outward and stiffness coefficient of spring on the outlet pressure of the moving magnet gas ratio control valve, and the distance that the nut moves outward and stiffness coefficient of spring on the outlet pressure of the moving iron core gas ratio control valve was studied. The results showed, the outlet pressure of moving magnet gas ratio control valve under the low load working state increases obviously with the distance the core moves outward, but the outlet pressure under the high load working state has almost no influence. The outlet pressure of moving iron core gas ratio control valve under low load and high load working state decreases with the distance that the nut moves outward, and the variation is consistent. When the outlet pressure of the gas ratio control valve under the low load working state keeps the same, the outlet pressure of moving magnet gas ratio control valve under the high load working state decreases with the stiffness coefficient of spring, the outlet pressure of the moving iron core gas ratio control valve under the high load working state remains when the stiffness coefficient of spring increases.

Key words: Gas ratio control valve, Outlet pressure, Moving magnet, Moving iron core