Introduces work principles of two adding pressure establishments for high-place fireprotectionwater tank;
介绍当高位消防水箱压力不足时常用的两种增压设施的工作原理；
2
Designed to retrofit backflow protection onto fire hydrants used for temporary water service.
适用于用在临时性水应用的消防栓上的防回流阀的更新改造。
3
The installation of vertical water supply pipes on some floors does not consider the space necessary for the installation of fire and waterprotection items.