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U-Cup
Categories : Rubber Products & Parts
U-Cups (U-rings) are versatile lip seals, named after their characteristic "U"-shaped cross-section. They are specifically engineered for reciprocating applications and serve as primary seals in hydraulic and pneumatic cylinders. Key Performance Benefits Pressure-Energized Sealing: The U-shape enables the sealing lips to expand against the hardware surface under system pressure. As the pressure increases, the sealing force proportionally grows, ensuring a reliable seal. Dual-Purpose Design: U-Cups function effectively as Rod Seals (preventing external leakage) and Piston Seals (preventing internal bypass between cylinder chambers). Optimized Friction: The lip geometry provides a secure seal with minimal contact area, reducing heat generation and mechanical wear during operation. Synergy with Back-up Rings High-Pressure Integrity: For systems operating above 5 MPa (50 bar), pairing a U-Cup with a back-up ring is essential to prevent material extrusion into clearance gaps. Structural Support: The back-up ring stabilizes the U-Cup in dynamic applications, particularly when large extrusion gaps or high-speed cycles are present. Common Industry Materials Polyurethane (PU): Offers superior abrasion resistance and high shear strength, ideal for heavy-duty hydraulic systems. Nitrile (NBR): Standard choice for pneumatic cylinders and lower-pressure environments. PTFE / POM: Often used for back-up rings to provide high-hardness support.
Washer
Categories : Maintenance & Lubrication
High-Performance Alternative to Standard O-Rings Our precision-engineered rubber washers—also known as square-cuts, lathe-cuts, or square-rings—feature a rectangular cross-section designed for superior sealing integrity. While they follow the AS 568 size standards and groove designs, their geometry offers enhanced stability and longevity compared to traditional O-Rings, making them the ideal choice for high-pressure and critical applications. Why Choose Rubber Washers? While O-Rings are versatile, Rubber Washers provide distinct mechanical advantages in specific environments: Superior Pressure Resistance: The rectangular profile handles higher pressure loads without extrusion. Enhanced Stability: Higher groove-fill rate prevents the seal from sliding, twisting, or spiraling during operation. Precision Engineering: Mold parting lines can be strategically placed away from sealing surfaces, ensuring a burr-free finish and tighter dimensional tolerances. Versatile Motion: While primarily used for static seals, they are highly effective for piston and rod seals.