对阀盘、耳轴活塞杆头的染料渗透剂测试。
Dye-penetrant testing of the disc trunnions and piston rod heads.
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.
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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