浮动球球阀的球体自由支承在阀座上，靠介质的压力形成单面密封，故不能保证密封。
The fluctuation ball ball valve's spheroid free supporting on the valve seat, forms the one-sided seal depending on the medium pressure, therefore cannot guarantee the seal.
该设计采用框架式省煤器固定结构，并自由支承在省煤器支承梁上，以避免固定装置与支承梁的现场焊接。
It is freely supported on the support beams of economizer to avoid the site welding between fixing arrangement and support beams.
同时，本文分析了位移波和应力波在固定端、自由端和弹性支承端的反射特点。
At the same time, the reflection characters of strain wave and displacement wave are analyzed at the fixed end, free end and elastic bearing end.
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