Medium pressure increases toward the valve seat surface and oblique cone sealing surface squeeze is tightening, sealing the better.

正向介质压力增大时阀板斜圆锥表面与阀座密封面挤压越紧，密封效果越好。

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Medium pressure increases toward the valve seat surface and oblique cone sealing surface squeezed more tightly, sealing the better.

正向介质压力增大时阀板斜圆锥表面与阀座密封面挤压越紧，密封效果越好。

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Testing include seat right side and back side strength testing, seat surface strength testing and seat surface activity endurance testing.

各项测试包括椅背正反面强度测试、椅背动作耐久测试、座面强度测试及座面动作耐久测试等。

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Since a 2007 recall, at least 50 incidents have been reported in which babies fell while the molded-foam seat was on a raised surface.

MSN: 4 million baby seats recalled after injuries - Health - Children's health | NBC News