Mechanical Seals

September 29, 2019

Mechanical Seals

(1) Select the appropriate seal material and hydraulic oil, as well as adaptability to working temperature and oil compatibility.

(2) The geometric position accuracy (concentricity) of the sliding parts relative to the seal is high (such as hard chrome plating), and the surface roughness is fine to prolong the service life.

1 For the hydraulic pump, the oil seal, used in the motor journal requires the roughness of the sliding surface to be within 0.25m of Ra and requires hard chrome plating on the surface. In the specific use, it is necessary to adjust the diameter of the lip of the oil seal according to the specific conditions. The spring force is applied to make it elastic, and a sealing sleeve or a thin gasket is used to protect the sealing ring during installation, to prevent the lip from rolling and twisting, causing the spring to slip out.

2 The inner surface of the hydraulic cylinder is usually processed by rolling, which improves the surface roughness and makes the surface cold-hardened, which is beneficial to prolong the service life of the sealing ring. In addition, the pressure used, the length, and the type of the sliding surface has a great influence on the service life. Therefore, you should determine the “check” time based on these conditions. 3 It is required that the sealing surface is in a good lubrication state and prevents dirt intrusion. It is also necessary to use the oil that meets the specified cleaning level and the correct installation method.




Fuan Zhongzhi Pump Co., Ltd


registered the trademark "ZOZHI."


Add:No.155 Shangcun Qinxiyang Industry Zone,Fuan city,Fujian,China

Tel:+86 0593 6532656 Fax: +86 0593 6531158

Mobile: +86.137.0604.0131