turndown ratio

基本解释

The results show that valve-sieve compound trays have smaller turndown ratio and smaller capacity.
试验结果表明：浮阀筛孔复合塔板操作弹性小、气液处理量小；
Used with most commercial gases. Wide turndown range, maintaining pre-set air-gas ratio, for single or multiple burner arrangements.
可作为基本单元或者和其他配件配合使用，适合大多数商业燃气使用。
chinaburner.com
Double hole diameters compound trays have a little larger capacity in comparison of single hole diameter compound trays and their turndown ratio is over 3.5.
双孔径复合塔板比单孔径复合塔板处理量略微增大，操作弹性高达3.5以上。