Stem and packing chamber walls. Close roundness, straightness and superior surface finish of 6 RMS or better for the stem and 63 RMS for the packing chamber.

• 阀杆和填料腔壁。精确的圆度、平直度和阀杆上6 RMS以上的超级表面光洁度,以及填料腔上63 RMS的表面光洁度。