Guide to purchasing hydraulic seals and the top 10 suppliers in Germany

Hydraulic seals are an indispensable component of numerous machines and devices that use hydraulic systems. In industries such as automotive, mechanical engineering, agriculture and construction, hydraulic seals are used to seal fluids and prevent leaks. As hydraulic systems often operate under extreme pressure and temperature conditions, high-quality seals are critical to the performance and service life of these systems. This buying guide explains the most important selection criteria for hydraulic seals and gives advice on choosing the best manufacturers in Germany.

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What are hydraulic seals?

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Hydraulic seals are specialized seals used in hydraulic applications to prevent leaks and maintain pressure within a system. They are used in a variety of applications, including cylinders, pumps, valves and other hydraulic components. Hydraulic seals help to improve the efficiency and safety of a system by directing the movement of fluid to optimize energy consumption.

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Important criteria for the selection of hydraulic seals

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When selecting hydraulic seals, there are several important criteria that should be considered. The following points provide a comprehensive overview of the main factors that play a role in the procurement and selection of manufacturers.

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1. material selection

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The material of the hydraulic seals is decisive for their performance and service life. Common materials are nitrile rubber (NBR), polyurethane (PU) and fluorocarbon rubber (FKM). Each material has specific properties and is suitable for different applications:

• NBR is resistant to oil and grease and is suitable for general applications.
• PU offers high abrasion resistance and is often used in dynamic applications.
• FKM is resistant to chemicals and heat, ideal for applications at higher temperatures.

The selection of the appropriate material depends on the specific operating conditions such as temperature, pressure and the type of fluid used. It is advisable to consult the manufacturer about the different material options and ensure that they are suitable for the specific requirements.

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2. pressure and temperature resistance

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Hydraulic seals must withstand extreme pressures and temperatures, especially in high-performance applications. When selecting seals, care should be taken to ensure that they meet the specific requirements of the system:

• Pressure ranges: Hydraulic seals can be designed for low, medium and high pressure ranges. Particularly robust seals are required for high-pressure applications, such as in industrial presses.
• Temperature ranges: Some applications require seals that can withstand high temperatures, while other seals must be designed for use at very low temperatures. Polyurethane gaskets, for example, have good temperature resistance for medium temperatures, while FKM is suitable for high temperatures.

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3. seal types and designs

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Choosing the right type of seal is crucial for the efficiency of the hydraulic system. Hydraulic seals are available in different versions, depending on the specific application:

• Rod seals: Seal the area where the piston rod enters the cylinder.
• Piston seals: Ensure the piston is sealed inside the cylinder and prevent pressure equalization between the chambers.
• Scraper: Removes dirt and foreign bodies from the piston rod to protect the seal and keep the system clean.
• Guide rings: Support the piston or rod movement and prevent metal-to-metal contact within the cylinder.

Each type of seal fulfills a special function, and several seals are often combined to ensure reliable sealing and guidance in the hydraulic system.

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4. wear resistance and service life

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Hydraulic seals are subject to high wear during operation, especially in applications with constant movement and high pressure. Wear resistance is therefore an important factor in the selection process. Materials such as PU and special compounds that offer increased abrasion resistance are suitable for heavy-duty applications. Manufacturers often offer additional options such as surface treatments or special coatings that extend the service life of the seals. A long service life and low downtime are crucial to keeping operating costs low.

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5. certifications and standards

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As hydraulic seals are often used in safety-critical applications, compliance with international standards and certifications is essential. Make sure that the manufacturer has certificates such as ISO 9001 for quality management and ISO 14001 for environmental management. Special certificates, such as for use in the food or medical sectors, may also be required depending on the area of application. Certification ensures that the gaskets are produced according to recognized standards and meet the necessary quality and safety requirements.

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