阀杆与阀盖之间带倒密封结构，便于阀门带压更换阀杆填料。
Valve rod with valve lids between bring fall airproof structure, Convenients for valve bring press replacing valve stem packing.
采用下装式阀捍，设置倒密封结构，能确保填料处可靠密封。
To adopt lower-installed type valve stem and set up reversed sealing structure can ensure reliable sealing at the position of the stuffing.
带倒密封结构的下装式阀杆，不仅防止了阀杆脱出，而且阀杆部位的密封更加可靠。
The lower-loading Stem with backward sealing construction not only prevents the handle form backing-out but also ensures the reliability of the scaling part of the handle.
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