How about the sealing ring for the piston rod seal?
The composite sealing ring, such as K type stepseal, it consists of two distinct components: one is to join the ladder bronze seal filler with PTFE (main seal), the other is a O shaped sealing ring (elastic element and side seal). The combination sealing ring (K type) has the characteristics of low friction resistance, no creeping at the start, low leakage and wear resistance. The combination of the sealing ring avoids the contact between the metal, improves the supporting ability, bears the certain lateral force, the small friction force, and is suitable for the high voltage and high speed system, and has been proved by the experiment.
Previously, the piston rod seals were mostly made of O - shaped sealing rings, narrow section Y - shaped sealing rings and V - shaped sealing rings. Because of the dry friction between the piston rod and the seal, these seals often lead to premature wear of the sealing lip. In the past, the piston rod seals were mostly made of O - shaped sealing ring, narrow section Y - shaped sealing ring and V - shaped sealing ring. Sealed with the sealing structure and common rod which allows ring velocity are relatively low, so it is widely used in motor speed are not high, such as engineering machinery, metallurgical equipment, light industry and agricultural machinery hydraulic equipment.
The sealing structure and sealing ring of piston rod is the key component in the reciprocating actuating mechanism. It is not only related to leakage problems, but also will affect the performance of the entire machine equipment and life. The piston rod in the reciprocating actuator, mainly to bear a certain axial force, and at a certain speed reciprocating movement 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 sealing ring of piston rod is particularly important.
