stop cock meaning in English

活栓
锁闭开关
停止旋塞
止水栓

Valves for gas installations ; angle pattern stop cocks
煤气装置用阀门.角度型旋阀
Valves for gas installations ; straight pattern stop cocks female threaded ends
气体装置阀.内螺纹连接端直通型旋塞
Valves for gas installations ; angle pattern stop cocks with compression fitting
煤气装置用阀门.带压力接头的角度型旋阀
When the pipe burst , a plumber had to be got in as no one knew where the stop cock was
管子漏水时，不得不请管道工人来，因为谁也不知道总开关在什么地方。