短語詞組短語spool pilot valve 滑閥SPOOL DIRECTIONAL VALVE 換曏閥閥芯spool balance valve 海緜橡膠spool regulator valve 安全閥閥柱spool relief valve 調(diào)壓閥閥柱spool proportional valve 滑閥式比例閥spool control valve 滑閥式控制閥one -spool suspension valve 單滑閥懸掛裝置閥three -spool solenoid valve 三滑閥電磁閥 返回 spool valve