The dynamic sealing packing provided is mainly used for plunger or piston rods in centrifugal pumps, compressors, vacuum pumps, reciprocating pumps, and reciprocating compressors. The packing components adopt a floating plane sealing element structure, composed of several small chambers.
This primarily includes packing chambers, throttling rings, locking rings, sealing rings, springs, etc. The outer circle of the locking ring and the sealing ring is tightened with a stretching spring, and after operation, the sealing function relies mainly on gas pressure and spring force to press against the piston rod.

Piston rings are consumable components of compressors. They are fitted into the annular grooves on the outer circumference of the piston. These split rings with a rectangular cross‑section are made of grey cast iron and possess certain elastic force. In their free state, the outer diameter of a piston ring is larger than the inner diameter of the cylinder.

There are three types of ring joints: straight‑cut, oblique‑cut and step‑lap cut.

By virtue of its own tension, the piston ring presses its outer surface tightly against the cylinder mirror surface, while its end face closely bears against the wall of the piston‑ring groove, so as to prevent gas leakage. To avoid compressed‑gas leakage through the ring gaps, the joints of two adjacent piston rings shall be staggered by no less than 120°. Apart from sealing, piston rings also perform oil distribution and heat conduction functions.