Product Categories and Applications of Cylinder Body Seals

Product Categories and Applications of Cylinder Body Seals

Product Application: This specification applies to applications where cylinder pressure exceeds 10 MPa and O-rings are used in conjunction. Silicone sealing rings are made of an open-cell porous material that can adsorb large amounts of substances, making them an excellent desiccant, absorbent, and catalyst support. The adsorption mechanism of silicone is typically physical adsorption, and the material can be regenerated and reused. To produce silica gel, an acid is added to an alkaline metal silicate solution (such as sodium silicate) to acidify it, followed by the addition of a certain amount of electrolyte for mixing; alternatively, adding an acid or an ammonium salt to a more concentrated sodium silicate solution will also yield silica gel. Operating temperature: −100 to 200°C.

Working medium: gear oil, emulsified oil, water. Material: polytetrafluoroethylene. Standard: JB/ZQ4224-86, compliant with GB1235-76.

Product Application: Used with conventional return-type hydraulic cylinders, internal hydraulic cylinders, or exposed valve seats to provide effective contamination protection. Applicable Fields: TPU—construction machinery, general-purpose machinery, various types of pneumatic cylinders and valves, etc.; CPU—hydraulic cylinders for construction machinery operating under extreme conditions. Materials: Polyurethane and nitrile rubber. Operating Temperature: –40°C to 120°C. Shore Hardness: HS 80 ± 5 A. Standards: JB/T 6657–1993. ※ The sealing ring delivers outstanding sealing performance and long service life; its dynamic-pressure sealing life is 5 to 10 times, and in some cases up to several dozen times, that of conventional rubber seals, and under certain conditions it can even match the service life of the sealing substrate itself. ※ The sealing ring exhibits low frictional resistance and requires minimal actuating force; its static friction is virtually zero, reducing the frictional force experienced by rubber seals at low speeds to only about one-half to one-quarter of the original level, thereby effectively eliminating “creep” at low pressures. ※ The sealing ring boasts exceptional wear resistance and, upon surface damage, possesses self-repairing and rotational filling capabilities. ※ The sealing ring features excellent self-lubricating properties, enabling oil-free lubrication during sealing operations. ※ The sealing ring has a compact structure, making installation and maintenance convenient. ※ Operating Pressure: 0–1300 MPa; Operating Speed: ≤15 m/s; Operating Temperature: –55°C to 250°C. ※ Compatible Media: Gear oil, compressed air, water, mortar, petroleum, emulsified oil, water–ethylene glycol mixtures, acids, alkalis, chemicals, and more.

Based on the cross-sectional shape of the sealing ring, the standard for this section can be classified into O-ring seals, star-shaped seals, X-seals, hollow-tube seals, V-seals, L-seals, U-seals, Y-seals, and special-profile seals. When selecting an O-ring, it is generally advisable to choose one with a larger cross-sectional diameter whenever possible. Under the same clearance conditions, the volume of the O-ring that is extruded into the clearance should not exceed the specified maximum limit. According to the material, seals can be categorized as nitrile rubber seals, natural silicone seals, chloroprene rubber seals, EPDM seals, hydrogenated nitrile rubber seals, silicone seals, fluororubber seals, and silicone–fluororubber seals. The standard designation for a seal is ID (inner diameter) × CS (cross-sectional diameter).

Requirements for sealing ring assemblies: Sealing rings are the key to addressing leakage in hydraulic systems and represent the most effective solution. If the sealing rings in a hydraulic system are inadequate, unacceptable leakage may occur, leading to oil contamination of the surrounding environment; moreover, air can enter the suction chamber, thereby impairing the operational performance of the hydraulic pump and compromising the stability of the hydraulic actuator’s motion. Therefore, it is crucial in hydraulic system design to appropriately select and properly configure sealing ring assemblies. The requirements for sealing ring equipment are as follows:

Under operating pressure and within a specified temperature range, the sealing ring should exhibit excellent sealing performance.

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