... valve-seat bore 气门座孔 valve-seat contact 气门座接触面 valve-seat cutter 气门座铣刀 ...
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valve-seat contact
阀座接触
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Metal to metal sealed ball valve with its body seat, ball, other metal parts, and so forth, closely contact with each other, having naturally formed a static electricity passage.
金属硬密封球阀的阀体、阀座、球体等金属零部件紧密接触，自然形成了静电通道。
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