阀盖轴承和整体阀座轴承引导阀杆总成，实现与阀座的精确定位。
A cover bearing and integral seat bearing guide the stem assembly for precise alignment with the seat.
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.
拆卸安全阀阀盖，阀杆/隔膜总成，和安全阀弹簧。
Remove the relief valve cover, stem/diaphragm assembly, and relief valve spring.
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