限制: place [impose] restrictions on [to]; astrict; restrict; limit; confine; shut down on [upon]: 限制数量 limit to a number or amount; 年龄限制 age limit; 时间限制 time limit; 对 ... 实行限制 impose restrictio
In - line flow restrictor protects the meter measuring element and the backflow preventer components from damage due to excessive flow 管内流量限制器保护仪表测量元件和防回流阀部件不会因为过大的流量而受到损坏。