信号闸阀常应用于自动喷水消防管路系统，来临界控供水管路，可以远地指示阀门开度。升杆式闸阀及附开度指示闸阀也经常应用于消防系统，如果闸阀安装位置离地面较高时，一般使用升杆闸阀，可以明显指示闸阀开度，若安装位置较低。则需要付开度指示闸阀。
Signal gate valve often used in automatic sprinkler fire piping system to the critical control and water supply pipes，remote indication of valve opening. Rising Stem Gate Valve and attached to the opening direction gate valve are often used in fire protection system，if the gate valve installation location away from the high ground，usually I lever gate valve，it is clear indication the valve opening，if the installation position of the lower. Gate valve is required to pay to open instructi**
