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1 hydraulic forming bellows formed the first seal, ensure that the valve Rod seal leakage. 

2 multilevel PTFE packing in the stuffing mix on top of the bellows forming a second seal, increases the reliability of seals. 

3 flange using mortising sealed structure, even in the case of pipe pressure fluctuations, ensure reliable sealing of flange. 

4 seal of paired structure using cone, plane type, seal automatic compensation to achieve effect of double insurance, sealing performance and stability, adhesion-free, long service life