The simplest type has a relatively high leakage rate
Classic design, but easy to rotate, cast aluminum material piston not recommended for use
Used for light gases and low-pressure conditions
Used for medium and high pressure conditions where the cylinder diameter is small and the piston ring material is brittle and hard
Used for medium and high pressure working conditions
When the cylinder diameter is large and the sealing pressure is not sufficient to provide sufficient back pressure, an elastic ring (expansion ring) will be added inside the piston ring to better fit the cylinder mirror surface
The support ring is used to support the partial weight of the piston and piston rod and guide the piston, without making contact with the cylinder but without any sealing effect.
Classic design
When the radial size is limited, use
Used for small diameter and brittle materials
When the width direction of the support ring exceeds 50% beyond the continuous mirror surface of the cylinder liner, entering the valve socket or expanding the hole, this ring is required
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