我喜欢我是用螺丝连接而不是压力。
I prefer mine to be attached using screws rather than just pressure.
按照NPT标准用螺丝连接的球阀由承包商提出建议，由业主批准。
Ball Valves screwed to NPT or an alternative as per Contractor's recommendation, subject to approval by Client.
机架采用优质钢板精加工而成，螺丝连接，避免了焊接造成的机架变形。
This machine USES high quality steel and connect with bolt rather than welding so as to avoid disfigure of the framework.
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