Gaskets and Seal Rings in Quick Couplings: Usages and Differences

Gaskets and Seal Rings in Quick Couplings

Hydraulic quick couplings are essential components in hydraulic systems, allowing for the quick and easy connection and disconnection of fluid lines without significant fluid loss or contamination. Within these couplings, gaskets and seal rings play crucial roles in ensuring leak-free performance and maintaining the integrity of the hydraulic system. Here’s an overview of their usages and differences:

Seal Ring and Gasket in quick couplings
Gasket and Seal Ring in an ISO A quick coupling



  • Sealing: Gaskets are used to create a seal between two stationary surfaces. In hydraulic quick couplings, they ensure that when the coupling halves are connected, there is no leakage of hydraulic fluid.
  • Vibration Absorption: Gaskets can absorb vibrations and slight movements between the connected surfaces, reducing the risk of damage and maintaining a secure seal.
  • Pressure Handling: They are designed to withstand the pressures within hydraulic systems, ensuring a tight seal even under high pressure.


  • Material: Gaskets are typically made from material of PTFE that can compress to fill any gaps between the surfaces.
  • Shape: They often have a flat, ring-like shape designed to fit precisely between the coupling faces.
  • Compression: When the coupling is connected, the gasket is compressed to create a tight seal, preventing fluid leakage.

Seal Rings


  • Dynamic Sealing: Seal rings are used to create a seal in situations where there may be movement or rotation between the components. In quick couplings, they ensure a leak-proof connection during coupling and uncoupling actions.
  • Preventing Fluid Escape: They prevent hydraulic fluid from escaping during the connection and disconnection process, maintaining system pressure and preventing contamination.
  • Durability: Seal rings provide a durable seal that can withstand repeated connections and disconnections.


  • Material: Seal rings are usually made from durable materials like nitrile rubber (NBR), Viton (FKM), or other synthetic rubbers that can endure the hydraulic fluid’s chemical properties and system pressures.
  • Shape: They often have an O-ring shape, which provides a robust seal when compressed between the coupling components.
  • Flexibility: Seal rings are designed to be flexible enough to maintain their sealing properties through the coupling’s mechanical actions.
Gasket and Seal Ring in quick coupling differences
Gasket is flat ring and seal ring is a round ring

Differences Between Gaskets and Seal Rings


  • Gaskets: Primarily used for sealing between stationary surfaces. They prevent leaks by filling gaps between flat surfaces that are clamped together.
  • Seal Rings: Used for dynamic sealing, accommodating movement between parts. They ensure a seal is maintained during coupling and uncoupling actions, handling both static and dynamic conditions.


  • Gaskets: Often used in static applications where components do not move relative to each other, such as flanged joints or fixed connections.
  • Seal Rings: Suitable for dynamic applications where components may move or rotate, such as shafts, pistons, or quick coupling mechanisms.


  • Gaskets: Typically flat and designed to be compressed between two surfaces.
  • Seal Rings: Often circular (O-ring) and designed to fit into a groove, providing a seal when compressed within that groove.


  • Gaskets: Usually Made from PTFE in Quick Couplings
  • Seal Rings: Made from more robust materials like nitrile rubber (NBR), Viton (FKM), or other synthetic rubbers suited to the hydraulic environment.


In hydraulic quick couplings, both gaskets and seal rings are essential for ensuring leak-free performance and system integrity. Gaskets provide a seal between stationary surfaces, absorbing vibrations and handling high pressures. Seal rings, on the other hand, are used for dynamic sealing, maintaining a leak-proof connection during coupling and uncoupling. Understanding their specific roles and differences helps in selecting the right components for reliable and efficient hydraulic system performance.

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