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引用 whs1 2008/11/30 8:20:29 发表于2楼的内容
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Doncloud 发表于 2009/2/15 0:24:43
3楼 回复本楼A Butterfly Valve （蝶阀）is from a family of valves called quarter turn valves. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is open, the disc is rotated a quarter turn so that it allows unrestricted passage. The position of the disc is effected from outside the valve.
Globe Valve, Solenoid Valve, Ball Valve, Check Valve, Plug Valve
Tantex Corporation, 欢迎选购。
引用 Doncloud 2009/2/15 0:24:43 发表于3楼的内容
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引用 comorg 2009/2/15 14:51:21 发表于4楼的内容