带法兰连接的球阀或替代阀门由承包商提出建议，由业主批准。
Ball Valves with flanged connection to be or an alternative as per Contractor's recommendation, subject to approval by Client.
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.
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