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Dynamic seals are devices used to maintain a seal between moving or rotating parts. They are commonly used in areas such as hydraulic systems, pneumatic systems, engines and rotating equipment. The main function of dynamic seals is to prevent liquid, gas or other media from leaking from the connection and to prevent external impurities from entering.
A pneumatic cylinder piston seal is a rubber part used to seal the piston in a cylinder, preventing gas or liquid leaks and contaminants from entering the equipment. It is made of rubber and has various sizes and materials. It has ISO 9001 and ISO/TS 16949 certifications, and is certified by the American Society for Testing and Materials and the Society of Vehicle Engineers. The seal’s advantages include increased efficiency, extended life, reduced leakage, enhanced controllability, and strong adaptability.
Dynamic EPDM rubber seals retain or separate fluids, keep out contaminants, and contain pressure. They create a barrier between moving and stationary surfaces in rotary or linear applications such as rotating shafts and pistons. The relative movement of the dynamic sealing system is rotary or reciprocating. Rotary motion is the movement of the shaft relative to its housing or stationary component and reciprocating movement is the linear motion of a rod or piston in a cylinder.
When the rotary shaft seals are used for a rotary shaft that rotates in both directions, one type of rotary shaft seals can be used (it can be used for either right-hand rotation or left-hand rotation), and , which can greatly improve the sealing performance.
Rubber Bellow Type Mechanical Seals are mechanical seals that use a rubber bellows as a spring element. Designed for the high volume mechanical market, these seals are able to solve many industry specific application challenges such as the oil and gas industry, mining and mineral processing industries.
PTFE piston seal is a seal used between the piston rod and the cylinder, usually made of PTFE material.
Rotary Shaft Seal for Linear Motion Shaft is specifically designed for linear motion axes. It functions similarly to a conventional rotary shaft seal, but is adapted to the special requirements of linear motion shafts. Traditionally, rotating shaft seals are used for sealing rotating shafts, such as rotating shafts, turbine shafts, etc. However, as technology developed, these seals were also applied to linear motion axes.
The radial shaft seal structure mainly consists of sealing lip, metal frame and self-tightening coil spring. The sealing lip has good elasticity. When the end of the sealing lip contacts the shaft, an oil film will be formed on the contact ends of the oil side and the air side to prevent lubricating oil from leaking and contaminants from entering, thereby achieving the sealing function of the rotating shaft.
Elastomer Bellow Seals are mechanical seals that use a unique elastomeric diaphragm or membrane as a secondary sealing component. This seal has a high degree of axial flexibility and is able to compensate for shaft misalignment, wear and problems caused by thrust movement of the shaft. This seal is designed to adapt to different applications and media, especially in various industrial fields.
Rubber u seal is a seal made of pure rubber or synthetic rubber, usually showing a U-shaped shape. Its main function is to prevent the leakage of liquid or gas, thereby effectively protecting the safety of equipment and pipelines.
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A dynamic seal is a component that is frequently found in mechanical and industrial equipment that stops liquids or gasses from leaking. They are made to effectively seal during movement to stop media leaks.
Mostly utilized on revolving or reciprocating parts like shafts, pistons, and valves, dynamic seals They typically have strong resistance to wear and corrosion and are composed of elastic materials, like rubber or polymer. Dynamic seals must adjust to shifting components without compromising sealing efficiency.
Seals, piston seals, shaft seals, etc.
The sealing ring is one of the most commonly used dynamic seals. It usually adopts a circular ring shape and is used to prevent liquid or gas from leaking through the axial direction. Piston seals are used to prevent medium leakage between the piston and the cylinder. Common types include piston rings and piston rod seals. Shaft seals are used to protect the seal between the rotating shaft and the external environment to prevent the leakage of lubricating oil or other media.
Dynamic seal selection depends on the application’s operating conditions and requirements. Because different working environments and media may have different effects on seals, such as high temperature, high pressure, chemical corrosion, etc. Therefore, when selecting dynamic seals, factors such as material tolerance, sealing effect, friction loss, etc. need to be considered.
Some dynamic seals can work in high temperature environments. For example, high temperature oil seals are commonly used in hydraulic systems and engines.
Some dynamic seals made of special materials can work in low-temperature environments, such as liquid nitrogen seals used in low-temperature liquid nitrogen storage and delivery systems.
Dynamic seals cope with high-pressure media, such as those used in high-pressure pumps or compressors.
For corrosive media, choose seals made of corrosion-resistant materials, such as polytetrafluoroethylene sealing rings, which are widely used in the chemical industry.
Dynamic seals are required to provide effective sealing on high-speed rotating components, such as shaft seals in wind turbines.
Dynamic seals are also used in the food and pharmaceutical industries.
Nitrile rubber (NBR)
Nitrile rubber has excellent oil resistance and wear resistance and is widely used in dynamic seals, especially for sealing media such as lubricating oil and fuel.
Styrene-butadiene rubber (SBR)
Styrene-butadiene rubber has good oil resistance and wear resistance, and is suitable for dynamic seals under some special working conditions, such as sealing of high-speed rotating parts.
Fluorine rubber (FKM)
Fluorine rubber has excellent high temperature resistance and corrosion resistance, and is widely used in dynamic seals in harsh environments such as high temperature and chemical corrosion.
Acrylic rubber (ACM)
Propylene rubber has good heat resistance and oil resistance, and is suitable for dynamic seals in high temperature and lubricating oil environments.
Neoprene (CR)
Neoprene has good oil resistance, chemical resistance and aging resistance, and is suitable for dynamic seals under some special working conditions.
Ethylene propylene rubber (EPDM)
Ethylene propylene rubber has good heat resistance, weather resistance and corrosion resistance, and is suitable for dynamic seals in some high temperature and outdoor environments.
(Sealing, wear resistance, heat resistance, elastic recovery, resistance to compression deformation, friction characteristics…)
The main purpose of dynamic seals is to provide an effective seal against leakage of liquid or gas. Therefore, good sealing performance is one of its most important mechanical properties. Sealing performance is usually measured by leakage rate, sealing pressure, sealing performance durability and other indicators. Its sealing performance is usually measured by leakage rate, sealing pressure, sealing performance durability and other indicators.
Wear resistance
Dynamic seals need to be in contact with moving parts when in motion, so their wear resistance is an important mechanical performance indicator. The wear resistance directly affects the service life and performance stability of the seal.
Heat resistance
In some applications, dynamic seals may be exposed to high temperatures, so their heat resistance is a key mechanical performance indicator. The quality of heat resistance affects the stability and sealing effect of seals in high temperature environments.
Elastic recovery
Dynamic seals should be able to return to their original shape and size after being deformed or stressed. Elastic recovery is one of the important mechanical properties to ensure the normal operation of seals.
Resistance to compression deformation
Dynamic seals should be able to maintain good shape stability and not undergo excessive compression deformation when subjected to pressure. The resistance to compression deformation is directly related to the sealing effect and service life of the seal.
Friction characteristics
The friction characteristics between dynamic seals and moving parts have a significant impact on their performance and service life. Proper friction characteristics can provide good sealing effect and movement performance.
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