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模压成型膨胀石墨填料(以下简称模压填料)是用多层膨胀石墨薄板涡卷在金属模具内加压而成的密封填料,石墨结晶的层间方向与阀杆垂直,故具有以下特性:(1)优异的耐热、耐寒性;(2)优异的化学稳定性;(3)优异的耐放射性;(4)优异的密封性;(5)由于具有自润滑性,对阀杆的磨损很小;(6)由于具有较大的弹性等原因,使填料与阀杆间产生较大的摩擦力;(7)强度较低。总的说来:模压填料是颇具特色,较为理想的阀杆密封填料。
Molded Expanded Graphite Packing (hereinafter referred to as molded packing) is a sealed packing made of multi-layer expanded graphite sheet scrolls pressed in a metal mold. The direction of interlayer of graphite crystal is perpendicular to the valve stem, so it has the following characteristics: (1 ) Excellent heat resistance, cold resistance; (2) excellent chemical stability; (3) excellent resistance to radioactivity; (4) excellent sealing; (5) due to the self-lubricating, ; (6) due to greater flexibility and other reasons, so that the filler and the valve stem between the larger friction; (7) lower strength. In general: molded packing is quite characteristic, the ideal stem seal packing.