This optional installation provides greatest maintenance serviceability and better regulation for installations where extreme low demand periods are frequent. Smaller regulator serves low volume demands, extending life of larger valve.

• 这种选择性安装能够提供最好的维护维修性,以及更好的调节功能,更适合经常出现超低需求的安装位置。较小的调节阀用于低流量需求,延长大阀门的使用寿命。