The superheater tubes end in a spherical seat.
这过热头管子末端在球形的位置上。
Second , Tight sealing , trim and sealing seat are contacting of spherical . It relies three-eccentric to achieve non-leakage;
密封严紧，阀芯和阀座的密封是球面线接触，靠三维偏心实现零泄漏；
Appear before the installation of seat spherical bearings with aligning properties, can reduce installation errors.
座圈的安装面呈球面的轴承，具有调心性能，可以减少安装误差的影响。
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