The seal structure and piston rod shaft seal are the key parts of the reciprocating actuator. It is not only related to the leakage problem but also will affect the performance and life of the whole machine and equipment.

Piston rod in reciprocating motion actuator, mainly bear a certain axial force, and with a certain speed reciprocating motion to external work. With the development of science and technology and industry, the requirement of reciprocating motion is higher and higher, especially in the case of high pressure and high-speed movement, the problem of sealing structure and piston rod shaft seal is particularly important. In the engineering design, we have used the sealing structure and seal ring with high pressure, high speed, and low friction for many times.

In a word, the following factors should be considered when choosing the sealing structure and piston rod shaft seal

(1) Speed of piston rod

(2) Working pressure

(3) Requirements of the piston rod shaft seal fit tolerance and groove size

(4) Starting friction force of piston rod

(5) Allowable leakage

(6) Working temperature

(7) Viscosity of working medium