Offers to Sell

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In sealing systems, X-rings, often called star-shaped seals, are instantly recognizable for their four-lip cross-section: their cross-section resembles a distinct "X." They can be installed in specialized, low-compression grooves to reduce friction, or they can directly utilize the AS568A standard O-ring groove and dimensions, effectively replacing O-rings in most applications without significantly modifying the hardware structure. Definition and Mechanism ·Structural Features: They have an X-shaped cross-section and four lips acting on the sealing surfaces. After pre-compression, they establish contact stress in the radial and axial directions. Higher system pressures increase the sealing force, making them a "pressure-energized" seal. ·Operating Condition Compatibility: They can be used for both static sealing and reciprocating and rotating applications. The four lips provide greater stability in dynamic conditions, resist rolling or twisting, reduce starting resistance, and facilitate lubrication development and retention. · Materials and Temperature: Common materials include nitrile rubber (NBR) and fluororubber (FKM), with a typical operating temperature range of -40°C to +250°C. Applicable media include hydraulic oil, water, and gas. · Interchangeability and Grooves: Standard dimensions align with American Standard AS568A O-rings, allowing direct use of O-ring grooves of the same specification. To further reduce friction and wear, a dedicated X-shaped seal groove with a lower compression ratio can also be used. Differences and Advantages Compared to O-rings · Lower Friction and Starting Resistance: The "lubrication cavity" between the sealing lips facilitates oil film formation, resulting in easier starting and slower wear. · Torsion Resistance and Stability: The non-circular cross-section suppresses rolling and torsion during reciprocating motion, reducing premature leakage caused by instability. · Optimized Sealing Details: The flash edge is located in the concave portion of the cross-section, which more easily focuses contact pressure on the effective sealing area, improving sealing reliability. Number of contact lines: Four contact lines, compared to two for an O-ring, provide more ample sealing contact and compressive stress distribution. High-pressure capability: With appropriate groove, tolerance, and support configurations, high-pressure operating conditions can reach 60 MPa. For extreme pressures or large gaps, it is recommended to consider the stiffness of both the retaining ring and the mating component. Groove and Selection Key Points Universal Installation: The O-ring groove can be directly used. For lower friction and longer life, a dedicated X-shaped seal groove is recommended (which offers a milder compression rate, lower dynamic friction, and heat generation). Dimensional Recommendations: For static seals (for holes): The matching difference between the seal ring inner diameter and the groove outer diameter should be controlled within approximately 2% to achieve appropriate interference fit and preload. For rotary seals (for shafts): The seal ring inner diameter is typically approximately 2–5% larger than the shaft diameter to account for thermal expansion, frictional heat generation, and lubricant film stability. · Dynamically Prefer Thicker Sections: For dynamic applications such as reciprocating and rotating, thicker sections are preferred for more controllable compression set, greater wear resistance, and greater sealing margin. Smaller sections are also suitable for static sealing. · Operating Condition Review: The selection process should comprehensively consider temperature (peak and continuous), pressure (including pulsation), media, motion type, and cycle. For rotating applications, the temperature rise and heat dissipation capacity caused by frictional heat should also be evaluated. Material and Operating Condition Matching · Nitrile (NBR): Compatible with most mineral-based hydraulic fluids and greases, it offers a balance of low-temperature performance and wear resistance, making it a "basic" for hydraulics and general machinery. · Fluorocarbon (FKM): Demonstrates stronger adaptability to higher temperatures and a variety of chemical media, making it suitable for oil and gas, chemical, powertrain, and some energy equipment. · Hardness and Formulation: Commonly found in the 70–90 Shore A range; higher hardness improves pressure resistance and extrusion resistance, but a balance must be struck between assembly requirements and low-temperature flexibility. · Pressure and Clearance: For high-pressure or large radial clearance applications, retaining rings/stops are recommended. The roughness and hardness of the sealing surface also directly affect the lifespan and leakage level. Application Scenarios and Audience · Pumps and Hydraulic Systems: For both reciprocating and rotary sealing, star-shaped seals offer reliable performance in shaft seals and plunger/piston rod applications. · Motors, Gearboxes, and Engines: They balance lubricant retention and torsion resistance, making them suitable for auxiliary oil seals at shaft ends and end caps. · Industrial Machinery and Robotics: Comprehensive sealing solutions for reciprocating actuators, rotary joints, and reducer interfaces. · Construction Machinery and Energy Equipment: Ensures seal reliability and lifespan management under high loads and pulsating pressures. · Wind Power, Metallurgy, Chemical Engineering, Water Treatment, and Shipbuilding/Rail Transit/Automobile (including heavy-duty trucks): These seals cover a wide range of applications, from static sealing flanges to dynamic bearings. If your system needs to reduce friction and starting resistance, inhibit torsion and extrusion, and maintain high compatibility with existing AS568A structures, a star seal (X-ring) is a good choice. Provide key operating conditions (temperature/pressure/media/motion type/clearance), and DEDE can quickly provide recommendations for selecting and sampling the X-ring series.

Minimum Order: 1000