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Typically, scrapers are made of NBR (nitrile butadiene rubber), PU (polyurethane) or PTFE (polytetrafluoroethylene). With this range of materials, a wide area of applications can be covered in terms of temperature range, system pressure and hydraulic fluid.

In such scenarios, a multi-component sealing system is advisable, with each component's functionality complementing the others. A sealing system, for example, may comprise one or more hydraulic seals along with guiding elements and wipers. Given the extensive variety of combination possibilities, we are keen to offer personalized consultation to create the ideal sealing system tailored to your application needs.

They have a symmetrical contact pressure curve and react extremely quickly to the pressure of the hydraulic medium. Here, too, depending on the area of application, pre-compression (installation under pressure, tension) may be necessary. This is achieved by the dimension and geometry of compact rings or by elastomeric O-rings. Our assembly tool for hydraulic seals is ideally suited for the installation of these seals.

This pre-loading can be achieved through the shape (e.g., compact rings) or multi-part seals (e.g., groove ring + O-ring or groove ring + spring). These seals also have sufficient sealing pressure without system pressure to prevent leakage.

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We will be happy to advise you in order to be able to manufacture the optimal hydraulic seals for your area of application.

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We perform best under pressure! Personalized advice for the highest demands and a fast delivery guarantee ensure your satisfaction. Contact our sealing experts.

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If sealing in the pressureless state is also necessary (e.g., to prevent the hydraulic fluid from leaking during storage or transport of the device), a seal with pre-pressing (installed under tension or pressure) must be used.

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The hydraulic piston seal distinguishes two categories, depending on whether the piston is loaded from only one side (single-acting piston seal) or is subjected to pressure loads from both sides (double-acting piston seal).

Cuando no aplica la garantía: Cuando nuestro Servicio Técnico revisa el producto y detecta que la falla es debido a un mal manejo o uso del producto, o bien falta de mantenimiento del mismo. Además, si instalación no fue realizada por nuestro personal o servicios autorizados el producto perderá la garantía.

Todos los productos usados y que presenten alguna falla deben obligatoriamente ser revisados por nuestros Servicios Técnicos. Estos emitirán un informe técnico profesional y si la garantía procede se repara sin costo o bien se cambiará el producto según sea el caso. Si esto sucede dentro de los primeros 3 meses de compra el cliente puede optar por la garantía legal que establece la ley.

Hydraulic seal types

Previously, elastomer O-rings and groove rings with thin sealing lips (conically tapering) were used, but these designs have become obsolete. Modern groove rings boast an optimal sealing lip profile, whose oil-side wedge gap achieves an optimal opening angle for sufficient lubrication of the seal surface while minimizing leakage (too steep: no lubrication film; too flat: thick lubrication film). This form of the sealing lips significantly enhances performance regarding stripping capability and retraction efficiency, especially under high pressure.

In this article, we want to introduce you to the foundations of hydraulic sealing, rod seals, and piston seals . Essential for efficient operational life are also wipers and guide elements, whose function, as well as profile and material options, we will explain in this article. We will also discuss individual sealing systems, since these are often the best choice in sealing technology. Learn about all the information on seals for various industries.

Hydraulic seals are designed to absorb large forces from the pressurized hydraulic medium, but may be sensitive to transverse, crushing, and shear forces. Guide rings absorb such forces and align the rod or piston centrally, so that wedging, scratching, scoring of the metallic components and destruction of the hydraulic seal by crushing or tearing can be avoided.

Typically, rod seals are asymmetrical wiper rings whose shortened inner seal lip dynamically seals against the piston rod. The outer seal lip maintains static contact with the cylinder head. Due to the design, it's possible to apply pressure load from only one side, thus they are referred to as single-acting seals.

HalliteSeals

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Groove rings are fundamentally circular sealing elements that feature a groove, or an elongated indentation, along their diameter. This groove limits the two sealing lips that create the sealing edges for static and dynamic sealing. Depending on the application area (inner-sealing rod seals or outer-sealing piston seals), either the inner lip or the outer lip is shortened. The precise geometry of the sealing lips greatly affects the seal's effectiveness in terms of tightness and leakage rate.

Todos nuestros productos cuentan con la garantía del fabricante o proveedor, bajo los términos establecidos por cada uno de ellos.ACO Maquinarias S.A. garantiza todos sus productos y cubre el reemplazo de todas las piezas que se puedan haber dañado por fallas de ensamblaje o fatiga de material, reparando o reemplazando dichos elementos de acuerdo a las garantías establecidas por los fabricantes o proveedores. Esta garantía cubre solo los elementos y no cubre traslado de técnicos fuera del radio urbano de la región Metropolitana.Todos los productos usados y que presenten alguna falla deben obligatoriamente ser revisados por nuestros Servicios Técnicos. Estos emitirán un informe técnico profesional y si la garantía procede se repara sin costo o bien se cambiará el producto según sea el caso. Si esto sucede dentro de los primeros 3 meses de compra el cliente puede optar por la garantía legal que establece la ley.Cuando no aplica la garantía: Cuando nuestro Servicio Técnico revisa el producto y detecta que la falla es debido a un mal manejo o uso del producto, o bien falta de mantenimiento del mismo. Además, si instalación no fue realizada por nuestro personal o servicios autorizados el producto perderá la garantía.

Rod seals seal the exit point of the piston rod from the cylinder. They are stationary in the housing, sealing statically with their outer ring. Internally, dynamic sealing occurs towards the movable rod.

In engineering, hydraulic seals are essential components of numerous modern machines. A hydraulic seal isolates components or chambers within a machine from each other, as well as the interior of a machine from its environment. They prevent the ingress of air, moisture, and dirt, as well as the escape of gases and liquids. High-quality seals for the industry and trade are therefore indispensable. The transmission medium in hydraulics is water (or oil), in contrast to pneumatics (pneumatic seal), which operates with air. Hydraulics, therefore, is the study of the flow behavior of various fluids in a hydraulic cylinder.

Our product range includes seals for hydraulic and pneumatic systems, among others, as well as specialized seals (with article numbers), spare parts, support rings, thread sealing (thread), and flat seals. Additionally, we provide high-performance materials such as Viton® and elastomers. At Kofler - Dichtungen, you can purchase your hydraulic seals or contact us for expert advice tailored to your needs.

Todos nuestros productos cuentan con la garantía del fabricante o proveedor, bajo los términos establecidos por cada uno de ellos.

We perform best under pressure! Personalized advice for the highest demands and a fast delivery guarantee ensure your satisfaction. Contact our sealing experts.

Accordingly, these single-acting piston seals such as rod seals are designed as asymmetrical groove rings, except that the outer, dynamically locking sealing lip is shortened.

We will be happy to advise you in order to be able to manufacture the optimal hydraulic seals for your area of application.

Depending on the required performance, sealing rings with rubber lips or special so-called double scrapers are used in hydraulics. Double scrapers have two sealing edges. The inner, oil-side sealing edge wipes off excess hydraulic fluid and leaves a sufficient lubricating film when extended. The outer sealing edge removes impurities from the retracting rod.

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Guide element seals allow the straight retraction and extension of the hydraulic rod and prevent occurring transverse forces from leading to contact with the metallic parts or other damage in the hydraulic system.

ACO Maquinarias S.A. garantiza todos sus productos y cubre el reemplazo de todas las piezas que se puedan haber dañado por fallas de ensamblaje o fatiga de material, reparando o reemplazando dichos elementos de acuerdo a las garantías establecidas por los fabricantes o proveedores. Esta garantía cubre solo los elementos y no cubre traslado de técnicos fuera del radio urbano de la región Metropolitana.

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The double-acting piston seal (hydraulic systems with differential cylinders between two pressure ranges) can be pressure-loaded from both sides, i.e. it separates two chambers from each other, both of which can alternately be under overpressure. Such double-acting piston seals are typically designed as symmetrical groove rings or compact rings.

Hydraulic sealing systems are deployed in particularly demanding applications that require high levels of sealing effectiveness and durability. In some cases, a single hydraulic seal may not provide enough power to meet specific requirements, such as extreme cold, heat, or significant contamination in the workplace.

Hydraulicsealsby Size

Single-acting piston seals are similar in principle to rod seals, with the difference that in single-acting piston seals the outer diameter seals dynamically, while the inner diameter sits statically on the piston (i.e. an inverse arrangement of the stationary and moving components).

We supply various sectors with our seals: construction, food industry, wood industry, energy technology, tunnel construction and agricultural and municipal technology.

Groove rings are typically made from wear-resistant PU (polyurethane), low-friction, temperature- and chemical-resistant PTFE (polytetrafluoroethylene), or flexible, high-performance elastomers (NBR, nitrile butadiene rubber).

Hydraulic seals fall into the category of dynamic seals. In general, a distinction is made between static seals, i.e. between stationary parts (for example in the case of flange connections) and dynamic seals, in which a component is typically in motion (e.g. in the case of rotating shafts or retracting and extending pistons in a cylinder). Shaft seal, rotary seals and seal ring.

Scrapers are located behind the actual hydraulic seal. These are components that are in principle not exposed to any significant pressure load. Wipers have a dual function: on the one hand, they wipe dirt, dust, water and other impurities from the retracting rod to avoid contamination of the hydraulic system. On the other hand, they must allow a thin film of oil on the rod to sufficiently lubricate the seal when retracting. A balance must be ensured here, because too large an amount of oil practically represents a leak and dirt adheres more easily to the oil layer.

If sealing is not required in a pressureless state, rod seals can be installed without pre-pressing. In operation, system pressure pushes the wiper ring against the sealing surfaces, ensuring proper tightness.

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It is important to differentiate groove rings from so-called compact rings, where the space between the sealing edges is filled with elastomer.

In general, hydraulic seals separate a pressurized fluid from its surroundings. In this case, the sealing gap is located between a moving piston and the housing or cylinder. The hydraulic seal has the following functions:

Depending on the field of application, guide elements can be designed as a guide ring or guide band. There are a wide variety of geometries and several materials to choose from.

We are experienced experts and can manufacture the hydraulic seals that are tailor-made for your requirements and areas of application.

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Hyd sealscatalog

Are you looking for complete hydraulic cylinder seal sets and seals? We at Kofler - Dichtungen offer standard sealing sets or custom-made products. We can also develop and mass-produce gasket sets of the gaskets below for you and your applications.

Hyd sealscatalogue

HRS seals are made of G-ECOPUR, a polyurethane with excellent abrasion resistance and tear strength.

A hydraulic cylinder seal set consists of several seals that are used in hydraulics. In the best case, all individual sealing elements work in harmony. It is important to coordinate the seal for hydraulic applications. The respective materials used play a decisive role in determining whether the entire hydraulic cylinder seal set works in the long term. The seals for the hydraulics are divided into piston seals, rod seals, rotary seals, grooved rings, scrapers and guide rings.

In addition, there is also the hydrostatic field of application, in which the seals must ensure that, for example, a cylinder must remain in the same position for a longer period of time.

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When using high-performance seals, it is particularly expedient to also install the corresponding matching guide elements, because premature wear or defect of such a seal is not economical.