Hydraulic seals and pneumatic seals are designed as per the cylinder working pressure, cylinder speed, operating temperature, working medium and application. Fluorocarbon FKM & Viton® -Rings: Chemical resistant Fluorocarbon FKM -Rings exhibit exceptional resistance to chemicals, oils, temperature extremes, low compression set, low gas permeability and excellent aging characteristics. The specific applications of hydraulic seals are as diverse and numerous as they industries they are found in. Hydraulic seals can be found in construction equipment, agricultural machinery, brake devices, clean rooms, conveyors, mixers, presses, valves, and test equipment. Hydraulic seals are most often found in hydraulic cylinders, the mechanical actuators that convert hydraulic pressure (from oil, water, or another pressurized fluid) into unidirectional force for agriculture and forestry vehicles, construction equipment, and similar mechanisms. If the correct elastomer material is not chosen, the seal will break down when it encounters a corrosive fluid and contamination will occur. Gaskets are used in fluid systems around the end caps of actuating cylinders, valves, and other units. Wiper seal for hydraulic cylinder also known as scraper seals is fitted on the head of the cylinder at the external side and provide a sealing contact to the piston rod. The T-seal comes in both piston (TPO) and rod (TRO) styles. DEPAC’s unique polymer material prevents installation damage thanks to its high elasticity and wear-resistance. UTI with asymmetrical profile of the sealing lips and back-up ring as a gap sealing component. The profile has been designed with a shallow groove to ensure tight contact between the static and dynamic part, even in zero pressure situations. Hydraulic seals are divided into two main groupings: static and dynamic. Buffer seals enhance the function of the rod seal by providing a buffer” against excessive internal fluid pressure. Similarly, in the electronic industry, seals such as EMI shielding gaskets serve to prevent unwanted electromagnetic interference in various devices. Rod Seals often see the highest pressure variation. We can also custom-manufacture a full range of seals, in a full range of materials to meet your exact requirements. Advances in more environmentally friendly hydraulic fluid is causing material compatibility issues with traditional cylinder seal materials. Common end use applications are industrial seals, Air Guns, Paintball Markers, pneumatic applications, and other high dynamic applications. Precision and repeatability over months or years of operation should be a factor in deciding what hydraulic seals to select for your project. Wear rings can be found at both the rod and piston locations within a hydraulic cylinder. General applications include cylinders, forming machines, hydraulic presses, and movable cylinders. And, most of the new seals outperform the previous products. Available in plastic, rubber and PTFE delivers the highest performance in a wide variety of rod seal applications. We offer a wide range of hydraulic seals produced by Italian GUARNITEC. New advances in hydrolysis resistant urethanes assist in solving one of the most common hydraulic sealing application problems. Seals play a critical role in the function of hydraulic systems. Guide rings are designed to prevent two dynamic surfaces within a hydraulic system from rubbing together. HydraPak’s cutting edge vulcanizing technology produces high quality seals with large diameter capabilities for your demanding applications. KAF’s computer-designed positive lip wipes foreign bodies away from the seal face. Rod seals are considered the most critical element of a cylinder sealing system. There are many types of hydraulic seals out there and they come in a variety of shapes and sizes. Rod seals specifically work by preventing external fluid leakage from the cylinder. Each ring is individually manufactured and provides excellent performance, as a supporting element, to both piston, rod and face seals that are generally found in static or dynamic applications. The following are the applications of hydraulic seals in various industries. A wiper seal can be installed to prevent seal failure and system breakdown.
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.
The type of material is determined by the specific operating conditions or limits due to fluid type, pressure, fluid chemical compatibility or temperature. Distributor of hydraulic seals. Hydraulic Piston Seals seals ensure fluid or other media does not by-pass the piston as the system pressure pushes the piston down the cylinder during a pressure cycle. Products include trim, flap, hatch, snap-in, D and P profile, pedestal and lid seals. Hydraulic Seals from Trelleborg Sealing Solutions are the first choice when it comes to sealing a high-performance cylinder. Parker offers a complete range of both activated and non-activated PTFE rod seals for hydraulic and pneumatic applications. We supply -Rings and seals in any size, material, durometer, color, and specialty performance. Other elastomer materials used to fabricate seals include butadiene, nitrile, butyl, and silicone. RUB seals made from Polyurethane are most effective, including a 300 BAR resistance which is suitable for high-pressure systems. Beyond these common variations are more specialized types of hydraulic seals. In addition to preventing leaks, oil seals retain oil and other lubricants for rotary applications. Oil seals, which are called metric oil seals outside of the USA, are used with hydraulic oil and made with materials that allow them to resist breaking down or malfunctioning in the face of repeated oil exposure. Polyurethane hydraulic seals have an outstanding resistance to general weather conditions. They are designed to be placed in a cylinder or piston groove to form a seal that will prevent leakage in the hydraulic system, they are a critical component to keep machinery working correctly and operating safely. When removing or installing -rings, avoid using pointed or sharp-edged tools that might cause scratching or marring of hydraulic component surfaces or cause damage to the -rings. Two major sources for hydraulic seals are rubber and plastics (including PTFE, such as Teflon, and polyurethane). Installation of hydraulic seals varies widely across different types of seal and different systems. Hydraulic seals can be single or double effect, according to the direction of the pressure generated in the cylinder. Distributor of hydraulic seals made from butyl and cast and millable polyurethane. Manufactured by the top polyurethane seal and component producers, with strong materials and extensive product expertise. Another sealing lip can be provided to protect the sealing contact proper from dust and other fine solid contaminants. In such applications, the function of Hydraulic Seals goes far beyond preventing fluid leakage. Durable and reliable Hydraulic seals are made from high grid materials which have the withstanding capacity. These superior materials were adopted in the MS28775 -ring, which is replacing AN6227 and AN6230 -rings, and the MS28778 -ring, which is replacing the AN6290 -ring. Consider the following when installing hydraulic seals in applications. Hydraulic seals can come in many sizes and forms based on the duties they must perform. The strongest -Ring material making it a popular choice in wear applications where abrasives, high pressure, and movement are present. A wiper seal can be made and can function as a wiper and a rod seal all in one groove where space is an issue. Custom manufacturer of seals used in hydraulic applications. Wear bands are also used to guide the piston and the rod during the stroke phase to prevent any side-loading. Wiper seals are extremely important in ensuring that outside contaminants are kept out of hydraulic operating systems. Wiper seals or Scraper seals are designed in a way to keep external contaminants out of a hydraulic system, by cleaning the rod in the cylinder on each cycle. A Dynamic Hydraulic Seal called a Piston Seal is exposed to movement on its outer diameter along the tube or bore of a hydraulic cylinder. We also furnish hydraulic seals for metric and JIS applications. Our engineers develop custom seals and guide bands that perfectly fit each newly sized cylinder. WRC Wiper Seals: Also including a lip, WRC seals do not extend past the cylinder cover.
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.
B-type loaded U-cup hydraulic seals are used for dynamic reciprocating applications. An example of weighing these different factors can be seen in the hypothetical selection of –wear rings. They use oil seals (or metric oil seals outside of the United States) that are made of resistant materials like Teflon, silicone, polyacrylate or a fluroelastomer that can handle continuous exposure to oil. Fluid Power Seals are special PTFE seals designed for use as either piston or rod seals and are activated by an elastomer -ring. Back-up rings prevent extrusion of the -ring when it is subjected to high pressures. Rod seals work together with wiper seals to protect a hydraulic system against external contaminants such as dirt and outside weather conditions. These seals are important for maintaining the piston position at rest and to control the motion of cylinder. Wiper seals or scraper seals plays an important role in preventing the entry of external contaminants such as moisture, dirt, and dust to the hydraulic system or cylinder assemblies. Our design process consists of working closely with you to understand the sealing requirements and then applying our design expertise and joint test program to develop the right sealing solution that improves your products sealing performance. Seal House can machine Rod Seals to suit almost any application. Wear rings guide the piston and piston rod within the hydraulic cylinder, absorbing transverse forces, preventing metal-to-metal contact. Nitrile – For applications with temperatures up to 250°F (Nitrile seal elements) with two Nylon or PTFE back-ups are recommended. Wear Rings:They guide the piston and piston rod within the cylinder. A type of dynamic hydraulic seal called a piston seal is exposed to movement on its outer diameter along the tube or bore of a hydraulic cylinder. Sealing Devices offers a complete line of Parker -rings, Polypaks, hydraulic seals, and sealing materials from stock, and is a Certified Parker Sealing Technology Center. This allows pressure build up on one side of the piston, making the cylinder extend or retract. Hydraulic systems are sealed using a combination of specialized seals. The reliable high performance of hydraulic seals is very important to applications in the medical industry. Additionally, with the implementation of our computerized numerical control (CNC) machine, we are able to create high quality hydraulic seals and have them ready to ship in a fraction of the time. Manufacturer of hydraulic seals and guides in several profiles or designs and in a wide range of series and sizes, making them appropriate for a variety of operating conditions and applications. Custom designed PTFE seals for unique applications. Rod seals prevent leakage of fluid from within the cylinder. Non-positive actuated anti-extrusion devices for use down stream from single and double-acting rod or piston seals. They also prevent metal-to-metal contact, optimizing the performance of the sealing system and increasing the seals’ lifespan. The buffer seals attenuate the pressure fluctuations to improve the rod seal performance. We offer a wide range of hydraulic seals designed to suit the cylinder working pressures, always taking the speeds, operating temperature and application into account. Hydraulic wipers prevent contaminants, such as water, dust and debris, from entering the cylinder assembly and hydraulic system. Hydraulic rod seals prevent fluid from leaking outside the cylinder. RFD Rod Seals: Also known as Single Acting Split Housing, these are heavy duty seals that also include an anti-extrusion ring for added protection. Sealing specialists Novotema, are well-versed in specifying the correct elastomer materials for medical application requirement, as well as a wide range of other life science industries. Commonly, wiper seals are constructed using the component polyurethane. Hydraulic applications in power transmission equipment and in control systems have become extremely popular over the years thanks to their efficiency. So, if you have an application that can be solved or improved by installing a hydraulic seal, consult a manufacturer today.