... screwed union 螺纹管接头 screwed valve 螺旋阀 screwed 用螺旋调节的用螺丝拧紧的 ...
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female screwed valve 内螺纹阀门
screwed globe valve 旋动球阀
screwed ball valve 牙口球阀
The control for this valve is a rotating crank handle that has to be screwed what feels like a hundred turns to switch from one position to the other.
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