国内阀门材料常用技术标准 缠绕式垫片密封元件和内环、定位环的内外径尺寸偏差
公称尺寸 DN |
密封元件 | 内环、定位环 | ||
D2a | D3a | D1 | D4 | |
≤200 | ±0.5 | ±0.8 | +0.5 | -0.8 |
250~600 | ±0.8 | ±1.3 | +0.8 | -1.3 |
650~1200 | ±1.5 | ±2.0 | +1.5 | -2.0 |
1300~3000 | ±2.0 | ±2.5 | +2.0 | -2.5 |
a 基本型和带内环型垫片D3不应为正偏差,基本型垫片D2不应为负偏差。 |
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