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The square nut for ball valves is made from PVC.
用于球阀的方形螺母由PVC制成。
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Many NIBCO ball valves are available for oxygen service.
许多美国尼伯科球阀都可用于氧气应用。
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Use full flow ball or gate valves only.
只选用全通道球阀或闸阀。
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Use full flow ball or gate valves only.
只选用全通道球阀或闸阀。
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