Some of the most common materials used for oil seals are nitrile, highly saturated nitrile, Viton®, FEP, silicone and polyacrylate.

In addition, the buffer seal cushions the rod from shock and vibration, increasing the life of the cylinder and its components. Rod and buffer seals are suitable for mobile and industrial applications, such as agricultural and construction equipment, where they are exposed to dirt, dust, and moisture.

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The correct  hydraulic cylinder seals, will maintain the integrity of the machine's system and extend its working life. Our hydraulic cylinder resealing services ensure such equipment runs at peak performance.

They also help maintain the pressure within the cylinder, allowing the piston to move efficiently. Piston seals are used in various applications, such as air compressors, hydraulic pumps, and internal combustion engines. As critical components in any reciprocating system, they ensure the efficient movement of the parts while keeping the system sealed and maintaining the pressure within.

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Choosing the correct polymer is important. While all seal materials are similar, each polymer serves a variety of purposes to meet any specific need.

Having done thousands of repairs, we have extensive knowledge and experience to expertly service your repairs and perform preventative maintenance. We also have a large inventory of seals and stock common steel shapes if your repair requires fabrication. If you’re looking for experienced and professional hydraulic repair service, contact Cylinders, Inc. today!

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Piston seals, also known as piston rings, are mechanical seals that reduce leakage between components in a reciprocating motion. Therefore, the primary function of a hydraulic piston seal is to form a seal between the cylinder tube and piston, preventing the leakage of lubricants and gases.

Wiper seals keep dirt, debris, and other contaminants from entering a system or machine. They are typically used for applications such as hydraulic cylinders, pumps, and valves and can be made from various materials, including rubber, polyurethane, and thermoplastic elastomers.

The term high elasticity is known as the ability of an object to return to its shape once it no longer is attached to its source of stress. Rubber compounds represent a wide collection of materials—known as elastomers—which includes base elastomer, vulcanization agents, fillers and plasticizers, with their main feature being high elasticity. Therefore, rubber is widely considered the best seal material. Questions to consider when selecting the seal material for an application include:

When selecting hydraulics cylinders seals, it is essential to consider the type of surfaces they will be used on. A static seal should be employed if there is no relative motion between mating surfaces. On the other hand, if there is motion between surfaces (either reciprocating or oscillating), then a dynamic seal should be used.

When it comes down to abrasive, water and oil resistant and super-strength properties, Buna is a cost-effective elastomer. Buna, also referred to as Nitrile rubber, is commonly known as the industry’s most economical seal material. Buna is well known for its mechanical performance and is a top performer when it comes down to oil-based, petrochemical and chemical applications. The more Nitrile in a polymer means a higher resistance to chemicals, acids and other oils. Buna is widely used in the industry for crude oil, water, various alcohol, silicone grease and hydraulic fluid applications due to its inflexibility.

Guide rings are mounted on pistons and piston rods of hydraulic cylinders to absorb side loads and prevent metal-to-metal contact between sliding parts, such as rod and gland/piston and bore. They are typically placed inward of both the rod and buffer seal and should be lubricated on assembly with the same lubricant used in the hydraulic system.

Data is presented for use only as a general guide and should not be the basis for design decisions. If you are designing oil seals and need help choosing the right material, just give us a call.

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In this blog, we look at how hydraulic cylinder seals are designed to prevent leakage, the main types of seals, and the materials they are made of to withstand high pressure.

As a hydraulic cylinder repair company, our team has been resealing hydraulic cylinders for over 30 years. We can help you no matter what your hydraulic system needs, and we are always happy to offer seal recommendations and answer any questions.

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Whether you are choosing Buna (Nitrile), EPDM or Viton, it is important to compare and consider all key features and benefits.

A hydraulic cylinder seal protects the hydraulic fluid and prevents the hydraulic system's components from mixing with external fluids. They also help to improve a system's overall efficiency and reliability, among other things:

With elastic and adhesive properties, once stretched, EPDM returns to its original shape regardless of the temperature. EPDM is not recommended for petroleum oil, fluids, chlorinated hydrocarbon or hydrocarbon solvent applications.

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Choosing suitable seal material is crucial, as it determines the overall quality and durability of hydraulic seals. Your manufacturer can suggest appropriate materials - whether you need hydraulic seal rings, o-rings, or any other type of seal -  to meet specific application needs. Below are the most common materials used to create seals:

If you would like more information about this product, please feel free to contact us. Recommend other popular products for you: difference between seal and gasket, seal sizes chart

With a wide variety of hydraulic seals available, it is essential to select wisely to ensure cost-effective hydraulic cylinder repairs. Doing so will help to guarantee a long operating life and improved performance over the lifetime of the hydraulic cylinder. Incorrectly sealing equipment can lead to premature wear and eventual failure.

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Hydraulic rod seals consist of a metal rod inserted in a rubber or plastic sealing element. The sealing part conforms to the rod surface, creating a tight seal that prevents internal pressure from escaping and external contaminants from entering the cylinder.

Viton can provide support for a broad range of substances and features and has resistance to high temperatures and resilience capabilities.

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Buna is comprised of synthetic rubber copolymer that performs well in applications requiring metal adhesion and abrasion-resistant material. This chemical background makes it ideal for sealant applications. Designed with poor acid and mild alkali resistance, Buna can also withstand low temperatures. Buna is limited in extreme factors such as high temperatures, weather, sunlight and steam resistance applications. It is also not suitable with clean-in-place (CIP) sanitizing agents containing acids and peroxides, such as OXONIA.

These rings are available in metallic and nonmetallic options. Factors such as the diameter of the rod and piston, the stroke length, pressure, type of seal, and lubrication must be considered when selecting guide rings.

Designed with a lip that scrapes the system's surface when it moves, they eliminate any particles that may have accumulated. Additionally, wiper seals provide an extra barrier against entering liquids and gases. They are commonly used in conjunction with other seals such as O-rings, and rod seals to provide a comprehensive sealing solution.

Buna, ethylene propylene diene monomer (EPDM) and Viton are all similar seal materials, but what makes them different? Choosing the right elastomer or polymer material is important for several reasons. While it may not seem like a major decision, the material chosen determines the quality, life span and performance of an application. From snapping to peeling to breaking, a seal material that is a poor fit for an application can lead to many issues down the road. Seal material has a long-term effect on an application’s capabilities.

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The difference between a rod seal vs. piston seal: Rod seals are flexible and keep pressure in and contaminants out, while piston seals are rigid seals that keep pressure in and lubricate in.

Hydraulic cylinder seals are an integral part of any hydraulic system because they control and maintain the pressure and movement of hydraulic fluid. Without them, hydraulic systems can't work correctly.

Viton is the more expensive option, but it is a solution for applications exposed to extreme weather, ozone and chemical degradation. Viton is a long-lasting, high-performance, fluorinated, hydrocarbon rubber product most commonly used in O-Rings and seals. Resistant to ozone, oxidation and extreme weather conditions, including materials such as aliphatic and aromatic hydrocarbons, halogenated fluids and strong acid materials, Viton is one of the more robust fluoroelastomers. Designed to withstand extreme temperatures, Viton seals are the preferred option for the most challenging and demanding sealing needs.

When considering flexibility, strength, weather resistance and the ability to withstand extreme conditions, EPDM is a good option. EPDM is a type of synthetic rubber and a commonly used elastomeric material for automotive, construction and mechanical applications. More expensive than Buna, it can withstand a variety of thermal, weather and mechanical properties because of its long-lasting high tensile strength. It is ideal for applications involving water, chlorine, bleach and other alkaline materials. From waterproofing to HVAC, EPDM is used for a variety of applications because of its resistance to weathering, ozone and deionized water.

Different types of sealing are available for hydraulic cylinders, ranging from simple O-rings to complex rotary seals, hydraulic ram seals, and hydraulic oil seals. Depending on the application, the type of seal required will vary; but all seals serve the same purpose of creating a secure, fluid-tight seal.

Hydraulic cylinder seals form a barrier between different components in a hydraulic cylinder. They are made with specific materials that adjust to varying clearance gap sizes and must be strong enough to withstand the shear stress created by system pressure.