紧密可靠，目前球阀的密封面材料广泛使用塑料，密封性好，在真空系统中也已广泛使用。
3 close and reliable, the current valve sealing surface material widely used plastic, good sealing, in the vacuum system has also been widely used.
紧密可靠，目前球阀的密封面材料广泛使用塑料，密封性好，在真空系统中也已广泛使用。
3 close and reliable, the current valve sealing surface material widely used plastic, good sealing, in the vacuum system has also been widely used.
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