... main valve chamber 主阀室 main valve disc 主阀盘 main valve head cap screw 主阀盖有头螺钉 ...
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主阀主要由阀座、主阀盘、活塞、弹簧等零件组成。
Mainly by the main valve seat, the main valve plate, piston, springs and other parts.
youdao
如果你能在邻居家打电话，叫煤气公司关掉外面的煤气主阀盘。
Turn off the gas at the outside main valve if you can and call the gas company from a neighbor's home.
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