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Types of sealing rings used for hydraulic cylinders
Release Time:
2023-05-22 15:38
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The导向 support ring is installed on the hydraulic cylinder end cap and piston, serving to support the piston rod and piston, guide the piston in linear motion, and prevent direct metal-to-metal contact. Materials used include plastics and bronze coated with polytetrafluoroethylene (PTFE).
Common sealing elements include O-rings, also known as oil seals, which serve to isolate hydraulic fluids and prevent leakage or seepage. Next, Tian Shu will guide you through the various types of sealing rings used in hydraulic cylinders.
Common types of seals used in hydraulic cylinders include dust wipers, rod seals, cushion seals, guide support rings, cap seals, and piston seals.
The dust seal is installed on the outer side of the hydraulic cylinder end cap to prevent external contaminants from entering the cylinder. Depending on the installation method, it can be further classified into snap-in and press-in types.
The snap-in dust seal is more commonly used. As the name suggests, this type of dust seal snaps into a groove on the inner wall of the end cap, making it suitable for less demanding environmental conditions. The material typically used for snap-in dust seals is polyurethane, and there are various structural variations available. H and K-shaped sections feature a double-lip structure, yet their fundamental principles remain unchanged.
The press-in dust seal is designed for harsh, heavy-duty conditions. It does not fit into a groove but instead features a polyurethane material encased in a layer of metal to enhance its strength, allowing it to be pressed directly into the hydraulic cylinder end cap. Press-in dust seals come in various forms and can be either single-lip or double-lip designs.
Piston rod seals are also referred to as The U-shaped cup is the primary piston rod seal, installed on the inner side of the hydraulic cylinder end cap. Its function is to prevent hydraulic oil from leaking externally. The piston rod seal is typically made of polyurethane or nitrile rubber. In certain applications, it must be used in conjunction with a support ring (also known as a retaining ring), which helps prevent the seal from being squeezed and deformed under pressure. Additionally, there are various variants available for the piston rod seal.
The buffer seal ring, serving as an auxiliary piston rod seal, is designed to protect the piston rod in cases of sudden pressure surges within the system. Typically, there are three common types of buffer seal rings. Type A is a one-piece sealing ring made of polyurethane. Types B and C are two-piece designs, used to prevent seal extrusion and enable the seals to withstand higher pressures.
The导向 support ring is installed on the hydraulic cylinder end cap and piston, serving to support the piston rod and piston, guide the piston in linear motion, and prevent direct metal-to-metal contact. Materials used include plastics and bronze coated with polytetrafluoroethylene (PTFE).
The end cap sealing ring is used to seal the gap between the cylinder end cap and the cylinder wall. It serves as a static seal, preventing hydraulic oil from leaking out through this gap. Typically, it is made of nitrile rubber. It consists of an O-ring and a retaining ring (snap ring).
Piston seals are used to isolate the two chambers of a hydraulic cylinder and serve as the primary sealing element within the cylinder. Typically, they consist of a two-piece design: the outer ring is made from PTFE or nylon, while the inner ring is crafted from nitrile rubber. Various variants also exist, such as those incorporating bronze coated with PTFE, among others. In single-acting cylinders, polyurethane materials are also employed. The U-shaped cup.
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