采用高平面度、耐磨损、耐腐蚀的端面密封片启闭，密封性能好，使用寿命长。
S adopts high flatness, wear resistance, corrosion resistance of end face sealing piece on-off, sealed performance is good, long service life.
采用高平面度、耐磨损、耐腐蚀的端面密封片启闭，密封性能好，使用寿命长。
S adopts high flatness, wear resistance, corrosion resistance of end face sealing piece on-off, sealed performance is good, long service life.
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