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。
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。
Only one atwisle to be used, the highest space utilization, beautiful and dignified, sealing better, widely used in archives, library, bank and company document, etc.
它仅需设一个通道，密封性好，美观实用，是空间利用率最高的一种货架，主要适于档案馆图书馆银行企业资料室等。
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