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三用阀是外注式单体液压支柱的重要部件,它由单向阀、卸载阀、安全阀三部份组成。支柱的升降和性能好坏全靠三用阀保证。升柱时,外部泵站来的高压液体经注液枪,将单向阀打开,高压液体进入支柱内腔,迫使支柱升高。当支柱与顶梁接触不再升高、注液枪停止供液时,单向阀关闭,切断内腔与外界的联系,使支柱保持一定的初撑力。随着支护时间的延长,工作面顶板作用在支柱上的载荷增加,当支柱内腔压力达
The three-way valve is an important part of the outer-type single hydraulic prop. It consists of one-way valve, unloading valve and safety valve. Pillar lift and performance is good or bad thanks to the three-valve warranty. When the column is elevated, the high-pressure liquid from the external pumping station is opened by the injection gun to open the check valve and the high-pressure liquid enters the column cavity to force the column upward. When the contact between the pillar and the top beam no longer rises, when the liquid injection gun stops supplying liquid, the one-way valve is closed and the connection between the cavity and the outside is cut off, so that the pillar maintains a certain initial support force. With the extension of support time, the load on the roof of the working face increases. When the pressure in the pillar inner reaches