After the packing is loaded into gland, the packing is compressed by the gland shaft. Due to the plasticity of the filler, it generates radial force and is in close contact with the polished rod. At the same time, the lubricant in the sealing packing is squeezed out, forming an oil film between the contact surfaces. Since the contact state is not particularly uniform, boundary lubrication occurs in the contact area. It is similar to a sliding bearing, so it is called the bearing effect! The untouched groove forms a small oil groove and has a thick oil film. When the polishing rod is opposite to the filler, during the movement, the contact part and the non-contact part form an irregular labyrinth to prevent liquid flow and leakage. This is called the maze effect.
After the packing is loaded into gland, the packing is compressed by the gland shaft. Due to the plasticity of the filler, it generates radial force and is in close contact with the polished rod. At the same time, the lubricant in the sealing packing is squeezed out, forming an oil film between the contact surfaces. Since the contact state is not particularly uniform, boundary lubrication occurs in the contact area. It is similar to a sliding bearing, so it is called the bearing effect! The untouched groove forms a small oil groove and has a thick oil film. When the polishing rod is opposite to the filler, during the movement, the contact part and the non-contact part form an irregular labyrinth to prevent liquid flow and leakage. This is called the maze effect.
The pressure cover axially compresses the sealing root through the pressure sleeve, so that the root of the sealing packing produces axial and radial deformation, and fills the gap of the sealing cavity to achieve the purpose of sealing. It can extend the seal life, reduce maintenance costs, and reduce pollution. Two-way sealing realizes zero leakage design. The two-way seal can not only bear positive and negative radial loads, but also ensure the two-way sealing performance. Seals are mainly used in fluid delivery systems, including various medical and dental equipment. One side of the sealing packing bears positive pressure, and the other side bears reverse pressure. Under pressure, the sealing lip of the seal can be close to the sealing surface to ensure that the liquid will not leak. Seal size is also an important factor in double lip seal applications. Smaller seals reduce the possibility of leakage.
