密封圈是合金钢堆焊，所以硬密封球阀在开关时不会产生太大的磨损。
(它的硬度系数为65-70):
二;密封性能好;由于硬密封球阀的密封是采用人工研磨，直到阀芯与密封圈完全吻合才能使用。
所以他的密封性能是可靠的。
三;开关轻;由于硬密封球阀的密封圈底部采用弹簧使密封圈与阀芯紧紧抱在一起，所以在外界力量超过弹簧的预紧力时开关非常轻。
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