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.
根据用户的需要，可以采用碟形弹簧加载的填料压紧机构，使阀杆填料的密封更加可靠。
Based on customers requirement, a packing tightening design may be employed to obtain more reliable stem packing seal, which is loaded by bevelling spring.
而压力侧以相同的力削弱了密封，这样使阀盖腔室和阀杆填料几乎总是承受最大管道压力。
The same force tends to reduce the seal on the pressure side with the result that bonnet cavity and the valve stem packing are nearly always subjected to maximum pipeline pressure.
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