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Symmetric Seals

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Symmetric Seals for Hydraulic and Pneumatic Applications

Symmetric seals, also known as bi-directional seals, are designed to function effectively regardless of the direction of pressure or movement. This makes them versatile and simplifies installation in hydraulic and pneumatic systems. Their symmetrical design allows them to seal equally well whether pressure is applied from one side or the other, or if the component they are sealing moves back and forth.

Types of Symmetric Seals

U-Cups/U-Rings

Many U-cup designs are inherently symmetric.

Compact Seals

Some compact seal designs offer symmetric sealing.

Specialized Lip Seals

Lip seals with specific lip profiles designed for symmetric sealing.

O-Rings

Can function as symmetric seals in certain applications.

Materials

Nitrile Rubber (NBR)

A common and cost-effective choice for general-purpose applications.

Viton (FKM)

For higher temperature and chemically aggressive environments.

Polyurethane (PU)

For applications requiring good abrasion and tear resistance.

Silicone

For applications requiring flexibility and temperature resistance.

Applications

Symmetric Seals seals are essential in a wide range of hydraulic and pneumatic systems

Hydraulic Cylinders

Especially in double-acting cylinders where pressure is applied to both sides of the piston.

Pneumatic Actuators

In systems with reciprocating or oscillating motion.

Valves

Where sealing is required in both directions.

Key Features and Benefits

Bi-Directional Sealing

Seals effectively in both directions, simplifying design and installation.

Versatility

Suitable for a wide range of applications with reciprocating or oscillating motion.

Simplified Installation

No need to worry about seal orientation during installation.

Reduced Inventory

One seal can often replace two different seals (one for each direction) in some applications.

Selecting the Right Symmetric Seal

Operating Pressure

The maximum pressure the seal needs to withstand.

Fluid Compatibility

The type of fluid or gas the seal will be in contact with.

Temperature Range

The range of temperatures the seal will be exposed to.

Speed of Movement

The speed of the reciprocating or oscillating motion.

Single Acting Simple

Symmetric seals designed for single-acting applications are engineered to provide reliable sealing in one direction. These seals are ideal for hydraulic cylinders where pressure is applied in a single direction. They are simple in design, ensuring easy installation and maintenance, and offer excellent resistance to wear, extrusion, and high-pressure conditions.
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Single Acting Complex

For more demanding single-acting applications, complex symmetric seals are designed with advanced geometries and materials. These seals provide enhanced performance in high-pressure and high-speed environments, ensuring long-lasting sealing solutions for heavy-duty machinery.
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PTFE

PTFE symmetric seals are designed for applications requiring low friction and high chemical resistance. These seals are ideal for hydraulic systems where smooth operation and durability are critical. PTFE materials offer excellent resistance to wear, extrusion, and temperature variations, making them suitable for a wide range of industrial applications.
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V Packs

V-pack symmetric seals are designed for applications requiring multiple sealing elements. These seals provide enhanced sealing performance, ensuring minimal leakage and optimal efficiency. They are ideal for hydraulic systems where high-pressure resistance and durability are critical, making them suitable for heavy-duty machinery and industrial equipment.
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UV Spring

UV spring symmetric seals are designed for applications requiring consistent sealing performance. The UV spring mechanism ensures a tight seal, even under varying pressure conditions. These seals are ideal for hydraulic systems where pressure fluctuations are common, offering excellent resistance to wear, extrusion, and temperature variations.
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Round Spring

Round spring symmetric seals are designed for applications requiring high flexibility and durability. The round spring design provides excellent sealing performance, even in high-pressure and high-speed conditions. These seals are ideal for hydraulic cylinders, offering resistance to wear, extrusion, and temperature variations.
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