When the tension formed by the setting pressure is greater than the tension of the elastic claws,the elastic claws open outwards,the mandrel goes down and the compression packing element is set.

• 当遇阻压力或坐封压力形成的向外张力大于弹性爪张力时,弹性爪向外张开,心轴下行,压缩胶筒坐封。