High-stability sealing element

A sealing element body comprises a sinking groove, a key groove, a fixed sector, a center shaft, a limiting protrusion, a metal shell and a balance weight attaching disc, the sinking groove is formed in the outer surface of one side of the sealing element body, the key groove is formed in the sinking groove, and the fixed sector is arranged in the key groove. The sealing element comprises a sealing element body, the sealing element body is sequentially sleeved from inside to outside, a center shaft is circumferentially fixed to the sealing element body, the center shaft is annularly sleeved with a fixed sector, a limiting protrusion is arranged on the outer surface of the other side of the sealing element body, and a metal shell fixedly provided with a balance weight attaching disc is arranged outside the sealing element body. According to the utility model, the counterweight structure is arranged, so that the structure of the sealing element can be stabilized and prevented from being deformed, the conditions