Abstract: Application characteristic of the accumulator, directional valve and filter in the hydraulic system of slag stopper by slide gate is analyzed. Application shows that using accumulators correctly in hydraulic system not only conserve energy, but also reduce the operating costs; selecting filters correctly according the function can maximum limit to reduce the oil pollution, ensure the normal operation of hydraulic system, improve hydraulic system contamination resistibility and reduce operating costs; using electromagnetic directional valve reasonably can improve the response speed of the actuator. Obvious effects can be get in Shougang Qian’an Iron and Steel Co., and the success rate of blocking slag come up to 100% after using quick changing type converter slag stopper.

Key words: slag stopper by slide gate, hydraulic actuation, accumulator, filter, valve Block