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SKF液压螺栓是由一个两端内螺纹长度不一样的中空的外部零件和同它螺纹连接的内部零件组成的。在内部零件中安装一个可以自由移动的柱塞。当油压最高达到3000巴(2943公斤/厘米~2)时,螺栓内部密封的增压室加压,柱塞使内部零件纵向拉伸,同时它的直径也减少了,这样螺栓能够很轻易地从通孔中穿过。使用一个阀接头,可以使被联结的油泵在没有压降的情况下拆卸下来。在螺母拧紧以后,可以去掉这个阀接头。这时油卸压,螺栓恢复原状。这样,螺栓
SKF hydraulic bolts are made of a hollow outer part with a different length of female threads on both ends and an internal part that is screwed to it. Install a freely movable plunger in the internal part. When the hydraulic pressure reaches up to 3000 bar (2943 kg / cm 2), the interior of the bolt is pressurized with a pressurized plenum and the plunger stretches the internal parts longitudinally and its diameter is reduced so that the bolt can be easily Pass through the through hole. With a valve adapter, the connected oil pump can be removed without pressure drop. After the nut is tightened, this valve fitting can be removed. When the oil relief pressure, bolt restitution. This way, the bolt