Hydraulic systems are sealed using a combination of specialized components. Some wipers have an additional lip to prevent contaminant ingression. Hydraulic applications are challenging for Seals. Rod seals help prevent hydraulic fluid from leaking from the rod end of a hydraulic cylinder. Under zero and low pressures, the -ring pressurizes the lips of the u-cup causing it to create a seal. Our seals and other cylinder repair parts are built to last far longer than the average seal and are held in high regard by many well-known Fortune 500 companies and OEMs. RUB Rod Seals: Made for sealing piston rods, these Single Acting seals include an additional -ring profile that lubricates and resists abrasions. Seals not currently being used need to be adequately stored, lest they deform, corrode, etc. Rod seals are commonly used static hydraulic seals for hydraulic cylinder sealing. A hydraulic seal is any of a number of soft non-metallic rings used to prevent leakage of fluid in hydraulic and pneumatic machinery. Here’s a secret – it is not necessary to buy replacement seals from the hydraulic cylinder manufacturer. Piston Seals can either be single acting or double acting seals. Wipers also provide static sealing function to the cylinder head versus the atmosphere. Anti-extrusion spherical bearing are available in many materials and custom profiles including rectangular, contoured, con-tinuous or split designs. Hydraulic seals are used in hydraulic and pneumatic cylinder pistons. Machined grooves in the cylinder housing allow the rod ring to seal directly against the piston shaft. Single-acting piston seals only have to block the pressure from one side of piston, retaining the pressure which powers the piston to move along the cylinder. Piston Seals are usually used in conjunction with bearings and guide rings. Polyurethane Hydraulic Seals will often outwear other materials by large margins especially in abrasive conditions. Gallagher offers the highest performing urethane and PTFE materials for your hydraulic application. For hydraulic applications and the u-cups for pneumatic applications Symmetrical u-cups and squeeze seals are available in a variety of lip shapes and materials. Piston Seals are mounted on a piston head which moves thru the bore of a hydraulic cylinder. Hydraulic -rings were originally established under Air Force-Navy (AN) specification numbers 6227, 6230, and 6290 for use in fluid at operating temperatures ranging from -65 °F to +160 °F. When new designs raised operating temperatures to a possible +275 °F, more compounds were developed and perfected. ESP offers a wide range of hydraulic and pneumatic; rod , piston , symmetrical , and wiper seal profiles and Parker -rings to meet the broad demands of the fluid power industry. Together with the wiper seals, the rod seals can protect the system from external contaminants. The most typical nitrile rubber seals have hardness ranges of 70, 80 and 90 shore. In these positions, seals keep fluid from leaking past the interface between the rod and head, from leaking to the outside of the cylinder, and from flowing across the piston. They are used to prevent contaminants from entering the cylinder when the extended rod retracts back. Piston Seals:These seals help in preventing the lubricant from flowing across the cylinder head. Hydraulic seals are generally made from elastomers, natural and synthetic polymers, which possess weak molecular attraction and highly elastic properties. As an applications engineer, Tim Girardi is no stranger to hi-tech or complex designs. Leakage through the Rod Seal is one of the most common failures so is of significant importance to make the correct choice of Rod Seal type and design. Hydraulic systems are usually sealed with a complex configuration of high performance seals. Piston and rod seals used in pneumatic and hydraulic applications in industrial cylinders. We offer our clients an extensive variety of Hydraulic Seals that have wide usage in various hydraulic machines. Rod Seals are often the decisive factor in the function of a hydraulic cylinder. We can supply seals for single and double acting cylinders, compact seals and composite piston seals, symmetrical seals, independent wear rings, bonded seals and static seals, such as rings.
The important functions of hydraulic seals includes preventing leakage, protecting the system from contamination and thus improving the life span of hydraulic systems. The softest -rings are 50 and 60 shore A and stretch more easily, exhibit lower breakout friction, seal better on rough surfaces, and need less clamping pressure than harder rings, For a given squeeze, the higher the durometer hardness of a ring, the greater is the associated friction. Multiple sealing lips. Available as single-acting and double-acting types, these seals can also be used with guide rings and back-up rings. Sealants, Seals, Gaskets and -rings are compulsories item for hydraulic components and systems. A rod wipers main function is to keep the rod and cylinder clean and free from foreign matter preventing premature failure. Also known as scraper seals, they are often used together with other sealing components to let a ram rod pass through the inner bore of a seal, while preventing leakage. And while we don’t perform cylinder repair, we do supply the seals necessary to replace your parts. Piston seals separate applied pressures between the piston and rod side during stroke movement and during the interim and final position. Wide range of materials available. The sealing force compensates for high-pressure to maintain a positive seal. Click here to view all types of Reciprocating Seals , specifically Hydraulic Seals or get in touch with an FTL engineer today using our live chat. Polyurethane has a high load-bearing capacity and because of this characteristic not only is it an ideal material for hydraulic seals but also for load wheels , heavy duty couplings, metal-forming pads, shock pads, expansion joints and machine mounts. Specifically, they seal the pressures during the stroke phase of the application. Mechanical, hydraulic & pneumatic seals feature multiple seal points, multi-lobed design, square cross sections & grooves on inside & outside dia. Piston Seals guarantee liquid or other media do not pass round the piston due to the system pressure pushing the piston down the cylinder amid a stress course. Rod wipers are used to clear dirt, debris and other contaminants from the rod so that the primary rod-sealing elements are protected. Rod Seals:These are used to prevent the leakage of lubricants from the cylinder. The Rod Seal is often the decisive factor for the function of the hydraulic cylinder in its entirety. Super Chemically Resistant Viton® ETP -Rings – Extreme Chemical Resistant Fluorocarbon provides significantly improved chemical resistance compared to standard FKM A type fluoroelastomers. Custom manufacturer of rubber, plastic & elastomer seals including hydraulic & pneumatic seals. Hydraulic fluid leakage continues to evolve as an important regulatory issue. The positive rake, lip profile provides an optimal amount of radial sealing load with minimal frictional resistance. It must ensure safe and leakage-free sealing under all system conditions, and at the same time it should produce as little friction as possible. Rod seals are vital to maintaining an efficient hydraulic system, as they are responsible for both preventing fluid leakage from within a hydraulic cylinder and protecting it against dirt and other exterior contaminates. The seal is obtained by means of the flared, flexible lips coming in contact with the rod or cylinder wall. Excluders – Used in a hydraulic or pneumatic cylinder to exclude or scrape the rod clean. Hydraulic seals are vital in machinery. Hoses, gaskets, -rings, tubing, seals and molded and extruded parts can be fabricated. Sealing Devices also provides molded rubber seals, extrusions, lathe-cuts, gaskets, packing, Teflon seals, mechanical seals, graphite, cloth, metal seals, -rings and metal rings, and a complete line of oil seals. Performance Sealing Inc (PSI) designs and manufactures a full line of high pressure hydraulic seal solutions. Piston and rod seals for medium to heavy-duty hydraulic cylinders. Mechanical seals prohibit fluid leakage around the rotating shaft in a state of extreme pressure, temperature and shaft speed.
Hydraulic seals of different types are governed by various standards and regulations at international, national, and local levels. Piston Seals are typically made of polyurethane but some piston seals can be made of fabric reinforced rubber. Some hydraulic seals are made for very specific applications. Our hydraulic seal product lines will provide you with confidence that your equipment will operate in the most adverse conditions. GBSA offers a wide range of effective hydraulic rod seals including polyurethane -rings. For over 20 years, it has been our dedication to service and outstanding product quality in all our hydraulic seals that have set us apart. These days, manufacturers also provide custom manufactured hydraulic seals to suit specific application needs. Hydraulic seals used internally on a sliding or moving assembly are normally called packings. The sealing direction is important for hydraulic seals and pneumatic seals in mechanisms that use axial movement, such as cylinders and pistons. However, Piston Seals are exposed to the motion on their outer diameter along the bore or tube of a hydraulic cylinder. The creation and development of the hydraulic seal mirrors the lengthy development of the hydraulic system, though modern hydraulic seals only appeared as polymers before they became better understood and utilized. 5. Affordable: Hydraulic seals can be ordered in bulk, and are extremely reasonable in terms of price. However, in both applications, there are common steps to execute to successfully install hydraulic seals. U-cups: These seals are used for low pressure systems. We started small, but now offer an extensive product list of hydraulic seals, rings, and other rubber products. The full range of static seals include -rings, back-up rings, flange seals, bonded washers and OP seals. Bellows seals use a formed or welded bellows to supply a secondary sealing and spring loading. The design helps prevent extrusion up to 5,000 PSI and spiraling (rolling) associated with -rings. Typical applications covered are cylinders, mobile cylinders, hydraulic presses and moulding machines. These allow pressure to build up within the piston, thus allowing the cylinder to extend or retract. Wear Rings absorb transverse loads on the rod and improve the durability of packings in a hydraulic cylinder. To help you identify the best materials to install hydraulic seals, contact Real Seal to create a customized solution and value for your business. We provide Simriz® -Rings from Freudenberg (Simrit) do to the unique durability of the product and the genuine care the people from Freudenberg have given us and the users of our -Rings. Double-acting pistons require pressure from both sides to force the piston along the bore, meaning that in order to properly seal them you must use a double-acting seal that can seal the dynamic pressure from both sides. Heating – To improve hydraulic seals’ elasticity, you can heat the seals before installation. Hydraulic cylinder seals cost the manufacturer pennies. The energizer ensures constant pressure on the sealing lips. FlexiSeals are PTFE sealing devices energized by special metal springs to maintain lip contact during no or low pressure service. Global -Ring and Seal, LLC is a master distributor of -Rings, Backup Rings, X-Rings, Cord Stock, and related seals, servicing industrial distributors worldwide. PEEK – For applications with higher pressures PEEK back-up rings are recommended, in place of Nylon or PTFE back-up rings. For heavy duty hydraulic seals used on the main ram of an extrusion press, rubber fabric chevron seals are the chosen solution to ensure maximum durability and reliability. If you’re looking to optimize your use of hydraulic seals over time, you’ll want to screen manufacturers for matching versatility. In the case of gauge control cylinders for example, short strokes and high frequencies have to be accommodated whilst imparting minimal friction aor stick slip. Symmetrical proﬁles are designed to act as either rod or piston seals, allowing one part to function in two applications.
This reduction in squeeze means less friction and improved seal life, and because parting lines are between the lobes, away from the sealing surface, problems of leakage associated with -rings is virtually eliminated. WRB Wiper Seals: These Medium Duty scraper seals have a special lip that help prevent moisture and dirt from accumulating on the rod. If the clearance gap between the sealing surface and the groove corners is too large or if the pressure exceeds the deformation limits of the -ring material (compound) , the -ring will extrude into the clearance gap, reducing the effective life of the seal. Manufacturer of standard and custom hydraulic seals. GUARNITEC use very high quality polyurethane compounds and other materials in their production. Many hydraulic seal suppliers have the same exact seals that are used in most hydraulic cylinders and can easily cross reference or match up a replacement. When the wiper seals are not secured or fail, it can cause component failure in a fluid power system that leaves other pieces of the operation open to serious damage. For heavy-duty hydraulic cylinders. You’ve discovered -Rings, Inc. Despite the greatest of care, conventional seals are highly vulnerable to damage of the sensitive sealing faces during installation. 3. Leakage control: The use of hydraulic seals can prevent any leakage, thus reducing any chances of downtime or repair. The specific operations of a hydraulic seal differ slightly depending on where the seal is located with regard to the hydraulic cylinder. Hydraulic seals should be a fairly high priority for checkups by your maintenance team. T-seals are composed of a sealing element with two split back-up rings. Industries hydraulic seals serve include aerospace manufacturing, agriculture, automotive manufacturing, chemical processing, defense contracting, food processing, marine products manufacturing, medical and pharmaceutical products development, nuclear power, pulp and paper, and waste disposal. Rods seals, piston seals, wipers, guiding rings and statics seals on stock. Rod Seals: These hydraulic seals are used to prevent fluid leakage within cylinder. Static seals that installed directly into the housing or glands of a system, rod seals are designed to provide dynamic sealing pressure while the piston rod is in dynamic motion. The external lip scrapes foreign matter from the rod, and the other lips act as an effective pressure seal in low pressure applications. Furthermore, purchasers of hydraulic seals should take note of vacuum rating, working temperatures, chemical compatibility (between the seal and the hydraulic fluid), highest and lowest working speed, and minimum and maximum pressure. Because System Seals specializes in custom designs and sizes, the company is a perfect fit for the cylinder repair industry, and it continues to save its customers millions of dollars each year. Asymmetrical seals are so designed that in the installed state they contact the static surface with an initial stress over the whole axial width in order to achieve a sufficiently firm seating in the groove. Wipers are designed to prevent any contamination to the system by external media during stroke movement of the cylinder. We will work with you to ensure our rod seal designs meet your application requirements. U-ring packings (AN6226) and U-cup packings are used in brake assemblies and brake master cylinders. FKM – When applications that require better chemical resistance and higher temperatures up to 400°F (FKM seal elements) with two PTFE or PEEK back-ups are recommended. Hydraulic rod seals are installed in a groove that has been machined in the cylinder housing to provide a tight seal against the piston shaft. These anti-extrusion rings are available in various extrusion-resistant materials and are located on the back-side or low pressure side of the sealing element they are supporting. Sealing Devices has experience with custom aerospace seals, and offers many items including geltek silicone sealant strips from stock. In addition to keeping fluid from leaking, seals also help keep dirt and contaminants out of the cylinder, which extends the lifespan of the cylinder.
By rolling the ring on an inspection cone or dowel, the inner diameter surface can also be checked for small cracks, particles of foreign material, or other irregularities that cause leakage or shorten the life of the -ring. Also known as scrapers or dust seals, hydraulic wipers are crucial to preventing damage to other system components. The most common hydraulic seals are piston seals and rod seals, which are both cylinder seals with a flexible lip that rubs against the housing or shaft for improved sealing during linear movement. Hydraulic seals are relatively soft, non-metallic rings that are constructed using materials such as polyurethane, rubber or PTFE. Hydraulic seals are different in that they are typically used in liquid or oil, whereas pneumatic seals operate in environments of compressed gas. Most packings and gaskets used in aircraft are manufactured in the form of -rings. The earliest hydraulic system, invented by Joseph Bramah in England during the Industrial Revolution, made use of leather seals to achieve the same results as modern hydraulic seals made of polymeric materials. Most replacement seals, for most applications can be found off the shelf and seal kits for well known applications can be picked up easily. Real Seal manufactures and distributes seal products and mechanical components with a strong focus on performance oriented rubber and plastic materials. 9. Prevents system collapse: By preventing leakage, the flow of fluid can be monitored, and as a result of it, the system can prevent from collapsing. Instead, they are used to maintain the concentricity of the rod in the bore so that the other sealing elements can function properly and don’t wear unevenly. Good dimensional elasticity to ensure faultless operation even with working eccentricities between the rod and the housing or the piston and the cylinder wall respectively, as well as expansion of the cylinder due to operating pressure. Custom manufacturer of seals for hydraulic system applications. UK Seals’ Hydraulic & Pneumatic range caters for the full range of duty cycles. Bonded seals are composed of an elastomeric seal that is adhered to a metal washer for high pressure applications. Urethane seals enjoy wide application as rod scrapers and other dynamic seals in high pressure hydraulic hose, which further attests to its strength and its ability to take abuse. This wiper can also be used as a secondary seal to trap slight leakage from the primary seal. Manufacturer of standard and custom seals, including hydraulic silicate and phosphate gaskets. Hydraulic Zone offers a diverse range of standard and special type cylinders to suit all types of industrial cylinder applications. In some cases, however, replacing hydraulic seals does become necessary. Seals made with these and other elastomeric materials are usually fabricated through extrusion, although Teflon seals are sintered in an oven from a powder form. Applications include: Hydraulic Oil, Petroleum Base, Silicone oil and grease, Mineral and vegetable oil and grease, Aliphatic hydrocarbons (fuel, butane, propane, natural gas), Aromatic hydrocarbons (benzene, toluene), Chlorinated hydrocarbons (trichlorethylene and carbon tetrachloride), Chlorine Water, Gasoline, Fuels, Liquefied Petroleum Gas (LPG), Natural Gas, Propane, Diesel Oil, High vacuum, ozone and weather. In our stock you will find piston seals (PK3 and PK4), u-rings (UN, D2 and D3) and wiper seals (MW, ME1 and ME2). Also known as Gland seals , Headbush or Neck Seals, Rod seals act as a pressure barrier to maintain and regulate the operating fluid in a cylinder. Coming in two different compounds, nitrile and polyurethane, our comprehensive line of u-cups are ideal in rod and piston applications. Chromex launched a new compact range of hydraulics seals designed to meet the majority of your needs. Rod Seals are deliberated to be the most substantial component of a cylinder sealing configuration. Dynamic Seal: A dynamic seal is installed within the inner shaft of the hydraulic cylinder. But that simple, inexpensive hydraulic seal can cost you thousands in downtime and loss of production if it fails.