大口径及高压的闸阀，启闭力矩较大。为了减小启闭力矩，可采用安装旁通阀的办法。旁通阀安装在主闸阀外部，它的进出口与主闸阀的两侧练练连接，并联联通。主闸阀开启前应先开通旁通阀，进入阀后，使主闸阀闸板前后的压力差减小，从而减小主闸阀的开启力矩。旁通阀口径的选用应根据主阀口径和使用要求考虑。
Z9B41H-10C DN32/Z9B41H-10C DN40/Z9B41H-10C DN50/Z9B41H-10C DN65/Z9B41H-10C DN80/Z9B41H-10C DN100/Z9B41H-10C DN125/Z9B41H-10C DN150/Z9B41H-10C DN200/Z9B41H-10C DN250/Z9B41H-10C DN300/Z9B41H-10C DN350/Z9B41H-10C DN400/Z9B41H-10C DN450/Z9B41H-10C DN500/Z9B41H-10C DN600/Z9B41H-10C DN700/Z9B41H-10C DN800/Z9B41H-10C DN900/Z9B41H-10C DN1000/Z9B41H-16C DN32/Z9B41H-16C DN40/Z9B41H-16C DN50/Z9B41H-16C DN65/Z9B41H-16C DN80/Z9B41H-16C DN100/Z9B41H-16C DN125/Z9B41H-16C DN150/Z9B41H-16C DN200/Z9B41H-16C DN250/Z9B41H-16C DN300/Z9B41H-16C DN350/Z9B41H-16C DN400/Z9B41H-16C DN450/Z9B41H-16C DN500/Z9B41H-16C DN600/Z9B41H-16C DN700/Z9B41H-16C DN800/Z9B41H-16C DN900/Z9B41H-16C DN1000/Z9B41H-25C DN32/Z941H-25C DN40/Z941H-25C DN50/Z941H-25C DN65/Z941H-25C DN80/Z941H-25C DN100/Z941H-25C DN125/Z9B41H-25C DN150/Z9B41H-25C DN200/Z9B41H-25C DN250/Z9B41H-25C DN300/Z9B41H-25C DN350/Z9B41H-25C DN400/Z9B41H-25C DN450/Z9B41H-25C DN500/Z9B41H-25C DN600/Z9B41H-25C DN700/Z9B41H-25C DN800/Z9B41H-25C DN900/Z9B41H-25C DN1000/Z9B41H-40C DN32/Z9B41H-40C DN40/Z9B41H-40C DN50/Z9B41H-40C DN65/Z9B41H-40C DN80/Z9B41H-40C DN100/Z9B41H-40C DN125/Z9B41H-40C DN150/Z9B41H-40C DN200/Z9B41H-40C DN250/Z9B41H-40C DN300/Z9B41H-40C DN350/Z9B41H-40C DN400/Z9B41H-40C DN450/Z9B41H-40C DN500/Z9B41H-40C DN600/Z9B41H-40C DN700/Z9B41H-40C DN800/Z9B41H-40C DN900/Z9B41H-40C DN1000/Z9B41H-64C DN32/Z9B41H-64C DN40/Z9B41H-64C DN50/Z9B41H-64C DN65/Z9B41H-64C DN80/Z9B41H-64C DN100/Z9B41H-64C DN125/Z9B41H-64C DN150/Z9B41H-64C DN200/Z9B41H-64C DN250/Z9B41H-64C DN300/ Z9B41H-64C DN350/Z9B41H-64C DN400/Z9B41H-64C DN450/Z9B41H-64C DN500/Z9B41H-64C DN600/Z9B41H-64C DN700/Z9B41H-64C DN800/Z9B41H-64C DN900/Z9B41H-64C DN1000/Z9B41H-100C DN32/Z9B41H-100C DN40/Z9B41H-100C DN50/Z9B41H-100C DN65/Z9B41H-100C DN80/Z9B41H-100C DN100/Z9B41H-100C DN125/Z9B41H-100C DN150/Z9B41H-100C DN200/Z9B41H-100C DN250/Z9B41H-100C DN300/Z9B41H-100C DN350/Z9B41H-100C DN400/Z9B41H-100C DN450/Z9B41H-100C DN500/Z9B41H-100C DN600/Z9B41H-100C DN700/Z9B41H-100C DN800/Z9B41H-100C DN900/Z9B41H-100C  DN1000
矿用闸阀型号