Valve rod with valve lids between bring fall airproof structure, Convenients for valve bring press replacing valvestempacking.
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。
2
The same force tends to reduce the seal on the pressure side with the result that bonnet cavity and the valvestempacking are nearly always subjected to maximum pipeline pressure.
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。
3
The stem seal of a feed water control valve uses expanded graphite packing in order to produce friction and to economize on energy for the control valve working.