HydraPak offers all the necessary elements for virtually every seal application. 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 flanged bushing 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.
Dynamic seals, which are also known as shaft seals, seal gaps between two surfaces that do share relative motion. More details on hydraulic seals types are discussed below. Our quick guide below shows the main types of seals that you would find in a cylinder and describes how they operate. With a negative lip design, dirt and foreign bodies in the hydraulic fluid can be pressed between the seal lip and the cylinder. These seals have virtually no size restrictions and are specially designed to optimize equipment performance. Rod seals are used in hydraulic cylinder systems to prevent fluid from escaping the cylinder. Guide rings are also known as wear rings since they serve dual purposes of centering the piston and piston rod while guiding them through the cylinder and preempting metal-on-metal contact. Parker’s Standard PolyPak® (SPP) is a square cross-section squeeze seal with a symmetrical profile for use in either rod or piston applications. To achieve a similar blockage of fluid without the use of seals is often unfeasible or completely impossible, due to the requisite precision and rapid wear of the relevant components. Not only must the hydraulic seals completely prevent leakage of fluid from the cylinder, but they must also withstand high pressures, extreme temperatures and transverse forces within the cylinder. Made from a wide range of sealing grade elastomers, these extruded and cut static face seals are available from030″ through 2.50″D. Hydraulic Seals Hydraulic seals are an integral component of most hydraulic systems. When purchasing hydraulic seals, there are some important factors to consider, such as the diameter of the housing bore and the inner or outer seal, the dimension of the outer shaft and the axial or radial cross section needed for the application. Rod seals and piston seals are available. They are specially engineered and can be used for Hydraulic Cylinder Seals and Hydraulic Rams. There are a few traits that any good manufacturer of hydraulic seals should have. Special care should be shown in selecting the best Rod Seal for your sealing application. So selecting the right material is an art because most applications are compromises, such as resilience versus stiffness, softness versus hardness, low temperature versus high temperature and performance versus cost. Discoloration of hydraulic seals can also be an indicator of chemical attack. Custom manufacturer of diaphragm seals for hydraulic applications. Scrapers or wipers scrape dirt, foreign particles, chips or moisture from the piston rods as they retract into the cylinder. We are happy to advise you about the possible applications of our product range or send you some information. Our unprecedented products are ideal for a wide range of applications. Hydraulic wear rings guide the piston, keeping it centered, which allows for even wear and pressure distribution on the seals. Seals located inside hydraulic cylinders are necessary to prevent leakage between components within the cylinder, which is as much of a concern as leakage out of the hydraulic system. A type of dynamic hydraulic seal called a rod seal is exposed to movement on its inner diameter along the shaft or rod of a hydraulic cylinder. Dynamic hydraulic seals, also called shaft seals, include rod seals and piston seals, which are hydraulic cylinder seals that keep pressurized liquids contained within the cylinder and contaminants and air from getting inside. Improper installation can cause cuts or dents in the lip of the seal, affecting the hydraulic seal’s efficiency and exposing the hydraulic fluid to contaminants. Hydraulic seals are intended to be used in hydraulic cylinders with reciprocating movements, mainly in industrial applications. ISO 9001:2000 certified distributor of hydraulic seals. Contamination particles in the hydraulic system are a primary reason for the failure or short service life of seals. The standard Molythane shell provides high wear resistance and the -ring energizer functions as a spring to maintain sealing contact under low pressure. Best example: hydraulic seals, which are very important for the operational reliability of units.
Balanced seals are seals that are designed to reduce the effects of hydraulic pressure in the seal compartment. Hydraulic Seals go far beyond preventing fluid leakage. Other polymer materials specified for your application. The symmetric seal is used for simple linear operations wherein the cross section of the seal is symmetrical, and this makes it an interchangeable option for rod and piston seals. Offers pump seals for hydraulic fluids with up to 2400 psi pressure, up to 14000 rpm speed, and -40 to 450 degrees F temperature. T-seals are also employed as replacements for existing -rings. Hydraulic seals can be made from a variety of materials such as polyurethane, rubber or PTFE. Applications include: CR is resistant to refrigerants, ammonia, Freon® ( R12, R13, R21, R22, R113, R114, R115, R134A), silicone oils, water, ozone, vegetable oils, alcohols, and low-pressure oxygen. A wide selection of sizes and alternate compounds allow this profile to match up with many hydraulic applications. While using the seal removal and the installation tools, contact with cylinder walls, piston heads, and related precision components is not desirable. Rod seals are used in hydraulic and pneumatic cylinders to seal the system pressure on the rod side against the atmosphere. The tee seal has two nylon back-up rings that are anti-extrusion devices and this allows for the T-seal to function under much higher pressures than a standard -ring. The classification of hydraulic seals is possible, based on function and design. Although static seals vary by number and exact location depending on the specific cylinder structure, all of them serve the purpose of closing gaps between immobile surfaces. The choice of wiper seal should be made based on the choice of piston and rod seals. Nitrile u-cups come in 70, 80 and 90 durometers and are ideal in low pressure, hydraulic and pneumatic cylinders. WCA Wiper Seals: Featuring a corrosion-resistant metal ring that encompasses the NBR seal, these Heavy Duty seals follow the side movement of the rod to keep it free from heavily deposited dirt. Over time however, it is expected that hydraulic seals will eventually need replacing, this can be down to general wear and tear, improper installation or exposure to extreme elements. At Allied Metrics, we offer our customers a full range of high-quality seals suitable for numerous applications. Whereas conventional seals are manufactured from leather, neoprene, rubber or fabric-reinforced elastomers, DEPAC puts its trust in polymer material. Wiper Seals:Also called wipers or scrapers, these prevent dirt, chips, and moisture from entering the piston rods, as they retract into the hydraulic cylinder. They are made with different profiles and materials and protect the cylinder head against possible leakage of liquids or gases. And, hydraulic wipers scrape moisture, dirt and other foreign particles from the piston rods as they retract into the cylinder. The Rod Seal is the seal in the hydraulic cylinder with the most demanding requirement specifications. In that sense, prioritization is important when selecting and applying different types of hydraulic seals. An additional consideration for hydraulic applications is that sealing components are often required to perform in higher temperatures, as well as return to their original dimensions after a sustained period of dynamic motion. A wiper helps prevent dirt particles from entering the hydraulic system. Not only must the hydraulic seals prevent leakage of fluid from the Cylinder, but hydraulic seals must also withstand high pressures, extreme temperatures and transverse forces within the cylinder. The edge of the sealing lip and the shaft counterface form the most important functional area of a radial shaft seal. By keeping everything from dirt to moisture outside of the system, scraper seals prevent any damage to rods, cylinder walls, seals and other important elements of the system. By reworking old bores and extending the life of cylinders, the inside clearance widens and changes the seal specifications. Hydraulic seal failure in medical applications can cause serious problems, ranging from inaccurate drug dosages to critical malfunctions with artificial hearts.
Special tooling for the installation of -rings is available. Seals may also be made from non-elastic materials such as felt and leather. Rod and piston installations use Wear Rings. Custom manufacturer of seals including hydraulic, mechanical, metric, military specification seals. Rod seals prevent rod corrosion and helps for the lubrication of wiper seal and rod seals. A seal may consist of more than one component, such as an -ring and a backup ring, or possibly an -ring and two backup rings. Than the outer lip in order to be used for rod applications. A single hydraulic system will usually make use of several different hydraulic seals, each designed to prevent leakage at a different point of pressure within the system. Rod Seals are the most critical seals in a hydraulic cylinder. Maintaining internal pressure and preventing contamination are leading priorities in terms of properly operating a hydraulic cylinder. They are considered to be multi-purpose hydraulic seals and are designed for significantly improved performance. Light-duty hydraulic and pneumatic U-cups used in pneumatic cylinders for industrial and low-pressure applications. 11. Safe: Hydraulic seals are completely safe to use even in the chemical and pharmaceutical industries. Moreover they are specially developed to accommodate different variables such as cylinder speeds, temperatures, pressures and applications. Also called double-lip U-cups and lip seals, they have nitrile lips and a urethane base to provide good stability and support large loads. Vee Packs: These are seals designed with multiple vee rings. The negative lip forms of normal seals allow dirt and foreign particles to be trapped between the seal lips and the cylinder. Sealing materials designed for life science and medical applications must demonstrate excellent resistance to the aggressive organic and inorganic chemicals and media associated with surgical and laboratorial procedures, including intensive cleaning regimes. We supply Hydraulic & Pneumatic seals for single and double acting cylinders, composite piston seals, compact seals, independent wear rings, bonded seals, static seals ( Rings), and symmetrical seals. Rod seals are key in preventing corrosion. A static hydraulic seal is located in a groove and sees no movement – only sealing within its confined space, acting like a gasket To achieve this the gasket should be under pressure. The material we choose for each hydraulic seal is determined by the operating requirements of each application. Style WK Rod Wipers Double lip design provides the ultimate in wiper action to remove foreign material from the exposed rod while still maintaining an adequate lubricating film. Scrapers & Wipers – Scrapers and wipers are components which prevent the build up of dirt, foreign particles and moisture from the piston rods by scraping or wiping it away. Rod seal kits include a rod assembly, rod wiper seal, U-cup rod seal, and -ring for repairing hydraulic cylinders. A hydraulic seal, at the end of the day, must prevent leakage of fluids from cylinders. Other products offered are mechanical, magnetic, non-contacting, and lip seals. Wear bands or wear rings are used to prevent metal-to-metal contact. Seals are divided into three main classes: packings, gaskets, and wipers. V-ring packings (AN6225) are one-way seals and are always installed with the open end of the V facing the pressure. Sometimes however you can use two single acting seals in a ‘back to back’ arrangement in order to create a double acting seal system. This seal is recommended when the coupling clearance between the head and the rod cannot be reduced and in the event of pressure peaks (500 bar). Hydraulic seals are also subdivided into seals, which have symmetrical or asymmetric cross-sections. Piston seal is a type of hydraulic seal where the sealing lip has contact with the entire housing bore. Quad rings can be used in both static and dynamic sealing applications. Rod Seal failure could result in fluid leakage. Rod Seals are affected by changes to the rod surface and fluid temperatures. Suitable for hydraulic applications that anticipate abrasive contaminations and shock loads.
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.