U-Seals (Profiled Gaskets)

U-Seals (Profiled Gaskets)

Core Features

  • Pressure-Energized Geometry: Featuring a distinct “U” shaped cross-section designed to be installed with the open channel facing the pressure source. As system pressure increases, the “lips” of the U-seal are forced outward against the sealing surfaces, creating a tighter seal.
  • High-Resiliency Elastomers: Manufactured from specialized polymers including Polyurethane (PU), Nitrile (NBR), Viton (FKM), and EPDM. Polyurethane is the industry standard for U-seals due to its exceptional abrasion resistance and high tensile strength.
  • Dynamic and Static Versatility: While primarily known as a high-performance rod or piston seal, the U-profile is also utilized as a heavy-duty static gasket for large-diameter valve bonnets and manifold blocks.
  • Low Friction Design: The specific lip geometry minimizes the contact area under low pressure, reducing breakout friction and extending the service life of both the seal and the mating hardware.
  • Broad Operating Range: Engineered to withstand hydraulic pressures up to 400 Bar (5,800 PSI) and maintain integrity across temperature fluctuations from -40°C to +200°C (depending on material selection).
  • Wide Tolerance Accommodation: The flexible nature of the “U” lips allows the gasket to compensate for slight hardware misalignments or worn cylinder bores that would cause standard O-rings to leak.

At Kriloha Ltd., we recognize that in high-pressure fluid power, “Static” isn’t always enough. When a system experiences massive pressure surges, a standard flat gasket can fail. The Kriloha U-Seal is engineered for “Active Sealing.” As a premier global supplier of industrial seals, Kriloha Gaskets has mastered the Precision Injection Molding and material science required to ensure your high-pressure systems stay hermetically contained.

The engineering of a Kriloha U-Seal is based on Hydrostatic Energization. Unlike a compression gasket that relies solely on bolt torque, the U-seal uses the fluid pressure itself to do the work. At Kriloha, we utilize High-Modulus Polyurethane for our standard U-seals because of its “memory”—the ability to maintain lip tension over millions of cycles. For chemical or high-heat environments, we offer Viton (FKM) variations that provide the chemical invincibility required for aggressive industrial fluids.

Manufacturing these seals at Kriloha involves strict Lip-Geometry Calibration. We ensure the “Leading Edge” of the seal is precision-trimmed to provide a sharp, clean wipe on every stroke. We offer these in both Symmetrical (for piston or rod) and Asymmetrical (specifically for rod or specifically for piston) profiles. Whether you are sealing a massive hydraulic ram on a mining truck or a sensitive pneumatic valve, Kriloha U-Seals provide the mechanical agility and pressure-handling stamina your equipment demands. By choosing Kriloha Ltd., you are investing in a “Self-Adapting” seal technology that thrives under pressure.

Primary Use Cases

  • Hydraulic Cylinders: The primary seal for pistons and rods in construction machinery, earthmovers, and industrial presses.
  • Pneumatic Actuators: Providing low-friction, long-life sealing for air-powered automation and robotic systems.
  • High-Pressure Manifolds: Used as a high-integrity static gasket in oil and gas manifold blocks where pressure spikes are common.
  • Water Hydraulics: Utilizing specialized EPDM or PU compounds for municipal water valves and large-scale irrigation equipment.
  • Heavy Duty Valves: Sealing the stems and bonnets of large industrial gate and globe valves in power generation facilities.
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FAQs

Which way should the “U” face during installation?

The open part of the “U” (the channel) must always face the higher pressure source. This allows the fluid to enter the channel and push the sealing lips outward against the housing.

Why use a U-Seal instead of a standard O-Ring?

U-seals are much more durable in high-pressure and high-abrasion environments. They also handle larger “extrusion gaps” and hardware wear much better than O-rings, which can easily be “nibbled” or torn in heavy-duty service.

Can I use a U-Seal in a vacuum?

While primarily designed for positive pressure, specialized U-seals with an Internal Spring (Spring-Energized) are used for vacuum applications to ensure the lips stay in contact with the sealing surface even without fluid pressure.

Is lubrication necessary for installation?

Yes. Kriloha recommends a light coating of a compatible system fluid or grease during installation to prevent “dry-start” wear and to help the seal slide easily into the machined groove.

How do I measure a U-Seal for replacement?

You need three key dimensions: the Inside Diameter (ID), the Outside Diameter (OD), and the Height (H) of the seal. Use a digital caliper for the most accurate measurement

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