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.
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 bonnet and packing box of low temperature service instrument in-line valves shall be extended bonnet type or heat traced, if necessary, to avoid freezing of valve stems.
低温设备仪表在线阀门的阀帽和填料箱应为加长阀帽型或伴热型(必要时)，从而避免阀杆结冰。
She assisted in the packing of her portmanteaus, and hopelessly bewildered her maid by stuffing silk dresses into her bonnet boxes, and satin shoes into her dressing-case.
她帮助收拾行李，把丝衣裳塞在帽匣里，把缎鞋放在化妆匣里，搞得侍女绝望地手足失措。
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