Rubber sealing rings, an indispensable "small component" in industrial equipment and daily machinery, play a crucial role.
They ensure the normal operation of equipment by preventing the leakage of liquids and gases, as well as protecting the
equipment from damage. These seals include common O-rings, V-rings designed specifically for rotating shafts, and U-rings
that perform well in dynamic sealing, each with its own unique features that can adapt to different working environments
and motion modes. These obscure 'small circles' are actually the guardians of the industrial sector, ensuring the efficiency
and safety of mechanical equipment. When choosing a suitable sealing ring, it not only improves the overall performance of
the equipment, but also effectively extends its service life, providing solid support for the sustainable development of modern
industry. Next, we will delve into the unique uses and characteristics of various rubber seals.
1. O-Ring (O-ring)
Purpose: O-ring is a common type of rubber seal that plays a crucial role in both static and dynamic sealing, effectively
preventing leakage of liquids, gases, and other media. It has a wide range of applications, including pipeline joints in hydraulic
and pneumatic systems, fluid conveying equipment such as valves and pumps, as well as rotary or reciprocating motion in
industrial equipment such as engines and compressors.
characteristic:
Simple structure: The cross-section of the O-ring seal is circular, making manufacturing and installation quite convenient.
Strong adaptability: able to maintain excellent sealing performance in both low and high pressure environments.
Cost effectiveness: Its production cost is relatively low, making it an economical sealing solution.
Diverse materials: Fluorine rubber, silicone rubber, nitrile rubber and other materials can be selected according to different
usage environments to cope with various challenges such as temperature, corrosion, and wear.
Durability limitation: In dynamic sealing, especially under high friction and high-speed motion conditions, its service life
may be relatively short.
2. Multi surface Seal
Purpose: Multi surface sealing rings are designed for environments with multiple sealing contact surfaces, making them
ideal for high-pressure, high-temperature, or high wear working conditions. It plays a key role in the dynamic sealing of
high-precision equipment, such as the sealing of hydraulic cylinders and air cylinders, and is also widely used in parts of
industrial machinery that require multi-layer sealing protection, as well as in situations where complex media or different liquids are isolated.
characteristic:
Excellent sealing performance: effectively dispersing pressure through multiple contact surfaces to ensure a more stable
sealing effect.
High pressure resistance and wear resistance: Especially suitable for long-term use in harsh environments.
Good adaptability: able to maintain stable sealing performance even on irregular surfaces.
Multifunctionality: It has multiple functions of leakage prevention, dust prevention, and wear resistance, meeting the
needs of complex working conditions.
3. Diaphragm (diaphragm seal)
Usage: Diaphragm seal, as a flexible rubber component designed specifically for isolating liquids or gases, aimed at
protecting critical components from erosion or contamination by media. Its typical application scenarios include:
Serve as a diaphragm in pumps or valves to achieve isolation of different media.
As a protective membrane for sensor components in measuring instruments, it ensures accurate measurement.
Adapt to dynamic sealing requirements and flexibly respond to complex motion modes such as bending and deformation.
characteristic:
Excellent flexibility: able to easily handle frequent bending and deformation, ensuring long-lasting durability.
High precision pressure transmission: providing sensitive pressure sensing, commonly used in precision instruments.
Strong corrosion resistance: particularly suitable for corrosive liquid sealing environments in the chemical industry.
Load bearing capacity limitation: In high-pressure environments, it may be necessary to strengthen the design or select
special pressure resistant materials.
4. Bellow (bellows seal)
Purpose: The bellows seal performs well in situations where motion compensation or vibration absorption is required.
Its typical applications include:
As an expansion compensator in pipeline systems, it adapts to thermal expansion and contraction.
In industrial equipment, absorbing thermal expansion or mechanical vibration to protect critical components.
In special mechanical devices, connecting moving parts to achieve seamless connection.
characteristic:
Efficient absorption of motion and vibration: The corrugated structure endows it with high flexibility, enabling it to
flexibly respond to axial or radial offsets.
High pressure and high temperature resistance: adapted to extreme working environments, ensuring long-term stability.
Multifunctionality: It has both leak proof and buffering functions, enhancing safety.
Easy to customize: Easily adjust the ripple shape and material according to actual needs to meet specific requirements.
5. V-Seal (V-shaped sealing ring)
Purpose: The V-shaped sealing ring is specially designed for sealing rotating shafts, aiming to prevent the invasion
of external pollutants or the leakage of internal liquids. Its typical application scenarios include:
Bearing sealing in industrial machinery ensures smooth operation of rotating components.
Protective sealing of motors and transmissions to prevent dust and moisture from damaging internal components.
characteristic:
High speed rotation adaptability: V-shaped sealing rings can maintain good sealing effect in high-speed environments.
Wear resistance characteristics: Its material has inherent lubrication properties, reduces friction, and lowers maintenance costs.
Convenient installation and maintenance: The simple structure makes replacement and daily maintenance easy.
Scope of application: Although the performance may be slightly inferior to other seals in high-pressure environments,
V-shaped seals still occupy a place in the field of rotary shaft seals.
6. Flat Seal
Purpose: Flat sealing rings are designed specifically for static sealing and are commonly used for sealing flange connections
or large equipment interfaces. Its typical application scenarios include:
The tight sealing of flange interfaces in pipeline systems.
Sealing requirements for large mechanical equipment under static conditions.
In the case of static isolation of liquids or gases.
characteristic:
Wide application range: Its large sealing surface design provides excellent contact area, ensuring strong sealing effect.
Easy manufacturing and installation: The simple structure makes the flat sealing ring easy to mass produce and quickly install.
Excellent pressure resistance: This sealing ring is particularly suitable for high-pressure environments and can stably perform
its sealing function.
7. Grommet (rubber sheath/sealing ring)
Purpose: Grommet is mainly used to protect wires, cables, or pipelines from damage or wear when passing through metal holes.
Its application scenarios cover:
Perforation protection of cables in mechanical shells.
The buffering effect between pipelines and metal components.
Prevent dust or liquids from entering the interior of the equipment through holes.
characteristic:
Powerful protection: It can effectively isolate metal edges, thereby preventing wear and tear of wires or pipelines.
Shock absorption effect: Its flexible material can absorb vibrations, further protecting wires or pipelines.
Excellent sealing performance: It also has sealing function to ensure safe use.
8. Oil Seal
Purpose: Oil seals are mainly used for sealing rotating shafts, aiming to prevent lubricating oil leakage and prevent
external pollutants from entering. It has a wide range of applications in various situations, such as:
Sealing of automobile engines and transmissions.
Sealing protection of bearings in industrial equipment.
Isolation of lubricating oil in power transmission system.
characteristic:
Compact structure: The oil seal design is simple, easy to install, and the maintenance cost is relatively low.
Strong durability: This oil seal can withstand high temperatures and corrosion, ensuring excellent performance even in harsh environments.
Wide applicability: Provides multiple types of options to adapt to different speed and pressure conditions.
9. U-Cup (U-shaped sealing ring)
Purpose: U-shaped sealing rings play an important role in dynamic sealing in hydraulic and pneumatic equipment. It has a wide range of
application scenarios, such as:
The reciprocating motion seal of the hydraulic cylinder piston rod ensures system stability.
The sealing protection in high-pressure systems can withstand extremely high pressure.
characteristic:
Strong self sealing ability: The unique U-shaped design enhances the sealing effect and reduces leakage.
High pressure resistance and high-speed movement: suitable for harsh working environments, such as high-pressure
and high-speed movement situations.
Long lifespan: able to work continuously and stably at high frequencies, reducing maintenance costs.
When selecting the appropriate seal, it is necessary to comprehensively consider various factors such as the usage
environment, the pressure it can withstand,
the temperature range, the characteristics of the medium, and the movement mode to ensure that the seal can perform at its best.
