These seals are typically found in hydraulic system applications that involve a rod and piston. Others are commonly referred to as Kalrez® -Rings (DuPont Dow), Chemraz® -Rings (Greene, Tweed & Co.), Isolast® -Rings (Trelleborg Sealing Solutions), and lesser quality brands such as Perlast (Precision Polymer Engineering), GPlast (Gapi) and Markez® (Marco). Since hydraulic seals are so critical to the efficiency of hydraulic systems, they are applicable across a wide range of industries. Piston Seals are radial seals. After the removal of all -rings, the parts that receive new -rings have to be cleaned and inspected to make sure that they are free from all contamination. Hydraulic seals of various makes sometimes have very long delivery times. Our offer includes high quality seals for hydraulic cylinders used in the industry and agriculture. When properly installed in a groove, an -ring is normally slightly deformed so that the naturally round cross-section is squeezed diametrically out of round prior to the application of pressure. For example, Parker Seal Company ran a series of brutal tests to determine how much fluid pressure a common nitrile -ring can withstand without extruding into the gap. KAF’s lip design was developed with integral preloading to be automatically self-sealing under high and low pressure. 4. Preventing blowouts: Blowouts on oil plants can be reduced to a great extent by using industrial seals. The main tasks of the seals are retaining lubricants, excluding contaminants adn maintaining the hydraulic pressure. X rings (also known as quad or square rings) are, in essence, enhanced versions of -rings. Wiper seals remove these contaminants when they retract into the cylinder. Our hydraulic seals are outfitted with seven precision-manufactured components. The UTS seal has small dimensions and has been created for cylinders under possible high pressure and speed variations. This allows pressure build up on one side of the piston, making the Cylinder extend or retract. Seal House offers a comprehensive range of Rod Seals in a variety of styles and materials to suit most applications. These seals protects the rod seals from the damages caused as a result of pressure rise. Based on criteria such as operating temperature, chemical interactions, pressure and fluid types, we select the materials that can handle each environment best. An elastomer which provides dynamic and static sealing against the shaft. A sealing lip has an edge which is formed by pressing, cutting or grinding and is normally pressed against the counterface on the shaft with a defined radial force by a spring. A high pressure hydraulic seal is usually surrounding rods, rams, glands or the piston and used a different design or combination of interlocking lips and components. The seals are located in the piston, on the cylinder head or on the rod shaft. The uses of rod seals vary from medium to high-duty applications with robust sealing effects. Types od seals include Vee-ring packings, urethane U-seals & polyurethane U-seals & double reversed packing sets. Fluid type, pressure, temperature requirements, speed of movement, environmental conditions chemical contact and many more factors are considered when choosing the most suited material. Hydraulic wear rings guide the piston and rod within the cylinder, absorbing forces and preventing metal-to-metal contact. Please see our products below and a Catalogue of hydraulic seals (PDF file, 11 MB). They are internal to the cylinder head and seal against the cylinder bore, preventing fluid flow. Skega’s success in this field has been built up around the well‐tried ‐ring seal which is combined with a new type of support ring and guide ring, produced in a new material and protected by the Swedish Patent No 221178. They have an enhanced extrusion resistance at high pressure and low temperatures and are used with heavy-duty cylinders. Dynamic (used when parts are in motion) or static (fixed application), different types of seals, each have their own role to play, in ensuring a cylinder runs as smoothly as possible. CDK Seals started out as a family-run business to supply PTFE seals, spring energised seals, rubber mouldings and hydraulic seals.
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 hydraulic guide rings 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.
A detailed understanding of the challenges seals will face in their exact operating environment is essential for an accurate specification, with different elastomer materials offering radically different performance characteristics across a range of parameters. Hydraulic seal installation varies depending on the nature of applications. We have an inventory of military and industrial seals (-rings, back-ups, hydraulic seals, thred-seals, stat-seals and all types of packing seals for hydraulic and pneumatics). Its outstanding tear resistance and abrasive resistance result in its slippery surface properties that make it advantageous for use in seals in moving systems such as mass spectrometer probes and valves. Static Hydraulic Seals are positioned in a housing where there is no motion involved, they are sealing only within their limited space. Fitted into the small housing, the RTA seals are combined with an NBR -ring and PTFE inner to maximize sealing resistance against even the highest pressure. Most often, they’re used to power linear actuators, hydraulic cylinders, and pistons in internal combustion engines. These extreme examples might not be commonplace, but they serve to highlight the importance of using high quality sealing solutions designed for the specific demands of such critical environments and applications. Hydraulic cylinders use water, oil or other pressurized fluids to facilitate the movement of heavy machinery. They also serve to protect the rod seal from any contaminants that do manage to find their way into the cylinder (such as metal chips). Single-acting piston seals for use in older type industrial hydraulic cylinders. This leads to scoring on the cylinder and piston rod (expensive repairs), leaks and environmental problems. Rod Seals are also referred to as shaft seals sometimes. Vulcanizing is an excellent solution for non-standard sized -rings and seals delivering greater strength and tolerances. Designed for medium duty applications and can provide both wiping and sealing action in one component in low pressure systems. For continued sealing effectiveness and long seal life, the surface finish of the working surface of either rods or bores should be a maximum of 16 micro-inches. In order to maximise longevity and functionality in specific applications, hydraulic seals are made from a wide range of materials, each with their own unique properties. Hydraulic seals (also referred to as hydraulic cylinder seals or shaft seals) are devices designed to keep fluids from escaping from cylinders or pumps while simultaneously preventing foreign contaminants from entering them. Leather and reinforced materials absorb hydraulic fluid. It’s difficult to pin down specific accessories for use with hydraulic seals, due to the extremely wide range of applications, industries, and types to consider. Piston Seals fit onto shafts with the sealing lip contacting the housing bore. There are two main types of hydraulic seals: static, which seals within a confined space like a gasket , and dynamic, which is exposed to movement on its inner diameter, usually around a shaft of some kind. Usually, hydraulic seals are located on the cylinder head, on the rod shaft, or in the piston. Hydraulic Seal – Allied Metrics Seals & Fasteners, Inc. Polymeric seals make for an easy, inexpensive, replaceable, effective barrier to fluids. Some particular types of hydraulic seals (e.g. bonded seals) are made from metallic materials (including brass, bronze, aluminum, carbon steel, and stainless steel). Therefore, Rod Seals function in conjunction with Wiper Seals to guard a hydraulic configuration against outer contaminants including dust, dirt and outside atmospheric circumstances. Whether it is small or large diameter, low or high pressure, reciprocating or rotary motion, dynamic or static sealing, a suitable product for your application is available. Since 2007 we have been making getting -rings easy by continuing to improve our people, product and process. General-purpose compound suitable for applications requiring resistance to aromatic or halogenated solvents or to high temperature (-20 to 260C with limited service to 315 degrees C). Outstanding resistance to blended aromatic fuels, straight aromatics, halogenated hydrocarbon and other petroleum products.
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.
In this case, a combination of PTFE composite seals and wipers would be used to ensure superior sealing performance and a long service life. Cutting edge technologies include multiple sealing lip systems, shock-load resistance, low friction and ultra-dry capability. The distinctive types of sealing positions and directions that are used for hydraulic and pneumatic seals are axial seals, rod or internal seals, external or symmetric seals and piston seals. There are many pieces of equipment that require precise motion control and sealing within the medical industry, and with ever-increasing technological developments, the demand for specialist sealing materials and products will only grow. The lip can also scrape any contaminants from the rod surface, giving them the title of double-edged wiper seals”. The four-lobed design provides twice the sealing of a standard -ring, but requires less squeeze to maintain an effective seal. These wipers provide excellent performance on rods or rams in hydraulic and pneumatic applications. It should also be noted that while all hydraulic seals are important, not every single one is equally important. Allied Metrics is a leader among hydraulic cylinder seal manufacturers. Wear Rings are used to retain the piston centralised. No. 3 – Chemical breakdown of the seal material is most often the result of incorrect material selection in the first place, or a change of hydraulic system fluid. Lip seals are made of many different elastomeric materials, including polymers, plastics and rubbers, and they are effective in providing a seal in revolving machinery and equipment. The wiper is not a pressure sealing element. For the vast majority of hydraulic applications, hydraulic seals are a non-optional component; it simply isn’t practical or reasonable to manufacture and use systems which do not use a number of hydraulic seals. Hydraulic cylinder Piston seals are a variation of the rod seals available as single-acting or double acting based on the capability to seal dynamic pressure either on one side or both sides. Wiper seals scrape dirt, chips or moisture from the piston rods as it them into the retract to the system. This allows to match the seal to many different types of cylinders, without making quality and price compromises. They are used to prevent the hydraulic fluid from flowing across the piston, from leaking past the interface between the rod and the head and to keep it from leaking to the outside of the cylinder. RTA Rod Seals: These Single Acting seals are used in hydraulic cylinders that have small groove dimensions. Make sure you confirm all relevant compliance issues for general use of hydraulic seals in your application, as well as identifying any relevant standards based on industry, application, environment, etc. A lubricant in the space between the sealing lip proper (primary lip) and additional (secondary) lip can reduce wear and delay corrosion. Hydraulic seal manufacturers generally fabricate seals from rubber or metal, and in some cases leather or felt. We supply wipers, rod u-seals, rod buffer seals, piston seals, wear rings, U-seals, vee packings, individual vee rings & adaptors, piston cups, T seals, piston assemblies, piston seal assemblies, piston rings, wiper rings, oil seals, ‘’ Rings, backup rings, quad rings & retainer rings, as well as bushes, teflon bushes & self aligning bearings for the cylinder eyes. Given the working conditions found in many of these industries, these seals need to be built to withstand high pressure. American Seal & Packing Loaded Lip Seals are molded from 92 Durometer Urethane with a 70 Durometer Nitrile energizer. Toughest of the elastomers used for -rings, characterized by high tensile strength, excellent abrasion resistance, and tear strength. Scrapers or Wipers scrape dirt, foreign particles, chips or moisture from the piston rods as they retract into the cylinder, preventing contamination. Piston seals are dynamic hydraulic seals that are used to prevent the passing of any fluid beyond the piston as the system pressure forces the piston down the cylinder.