当关闭通道时，用阀杆的楔形头使球体涨开与阀座压紧达到密封。
When the closed channel, the wedge-shaped head with a stem to open up the ball and pressed to seal the valve seat.
木头把（柄）应该完美无损，要做楔形头牢固地镶在工具上，不能用带子捆绑裂缝之类的伤痕。
Wood handles should quite possibly be sound and securely wedged or fastened to the tools. Tape should not supply to cover defects such as crair conditionersks.
后来，我开始接受药物治疗，睡在楔形物上抬高我的头和肩膀，感觉好一些了。
Later, when I began to take medication and sleep on a wedge to elevate my head and shoulders, it got better.
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