?螺旋阀
... 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 ...
内螺纹阀门
旋动球阀
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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