Parker Hannifin Seals

  1. Optimizing Rubber Component Design With Nonlinear Finite Element Analysis (FEA)

    Have you been frustrated with going through multiple design iterations when rubber components are failing due to high stresses or your device has been leaking due to insufficient compression? Have you lost months and months of precious time having to recut tools and make design changes?

    FEA takes out the guesswork

    Finite element analysis, also known as FEA, is an effective tool used in design iterations. It allows for different design ideas, options, and alterations to be quickly, effectively, and precisely compared. 

    Using FEA can improve both the speed and quality of product design as well as reduce the overall cost. Rubber parts, such as silicone diaphragms, septums, seals, valves, tubing, and balloons are critical components in today’s medical devices that can benefit from the use of FEA.

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  2. Sealing Solution Extends Service Life of Swivel Joints

    Mobile cranes perform a wide variety of tasks, typically of the heavy-duty kind. The work they do and the locations at which they operate are frequently exposed to harsh climatic conditions in places with insufficient infrastructure. This means that the sites at which the cranes are positioned and the environment in which they move is often not entirely suitable for this kind of heavy construction equipment.

    Accordingly, there are high loads acting on the components, which often wear out prematurely as a result. A new sealing solution for swivel joints in cranes subjected to high loads, which combines a polyurethane O-ring with a nobrox® backup ring, has effectively remedied this issue.

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  3. Parker's Thermo-Chem - High Temperature Firewall Rope, Tape, Sheet, Cloth and Tubing


    Providing long heatsealing life with high conformability

    Thermo-Chem firewall sheets, rope, tape, cloth and tubing are flexible, fire-resistant fabric products used in applications where flame and fuel resistance is required.

    Their composition and construction from woven and texturized glass yarns, plain or wire-reinforced, form a non-porous, non-fraying, high tensile strength, firewall that offers long-term resistance to oils, solvents, vibration and abrasion. In addition, their flexibility enables them to readily conform to a variety of shapes.

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  4. Parker's BRE Compounds Bridge Gap Providing Improved Properties Over FKM & Aflas®

    Fluids play a critical role in sustaining life. Keeping animals and humans hydrated and helping plants grow are obvious ways. Less obvious ways include moving cargo around the world and keeping equipment operating (hydraulic oils, coolants, engine oils, etc.). All these applications require seals of some sort ranging from public water systems to hydraulic pumps. What happens when these fluids become aggressive? People typically think of acids as being an aggressive media, but for many fluoroelastomers, bases are more aggressive presenting severe challenges.

    Using material science and technology, Parker has created a new class of Base Resistant (fluoro) Elastomer (BRE) compounds. 

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  5. New Self-Retaining Static Seal Can Efficiently Seal Bores in Non-Pressurized Applications

    Article re-posted with permission from Parker Hannifin Sealing & Shielding Team.

    Original content can be found on Parker’s Website and was written by Vivek Sarasam, heavy duty mobile Sr. application engineer, and Jeffrey Labonte, market manager.

    Roll2Seal® is an all-new sealing solution developed by Parker Prädifa for easy and effective closure of bores in non-pressurized applications. The clever, patent-pending design combined with an equally new assembly process enables simple and accurate installation of the seal, which rolls into its seat undamaged and without a lead-in chamfer.

    What can be done if a bore requires radial sealing but lack of a lead-in chamfer prevents the installation of a seal? A situation like this occurs, for instance, when an existing bore should be closed with a cover and space around the bore is too small for a classic flange seal. A seal would not survive an attempt to install it in a bore without a lead-in chamfer. Part of the seal would be sheared off at the edge of the bore even if the edge was chamfered or rounded.

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  6. Tadpole Tape - Is it a right fit for you?

    Tadpole Tape Seals under light pressure while resisting flame and prolonged high temperatures

    Tadpole tapes are resilient and nonabsorbent, flame-resistant gasketing materials. They are especially suited for applications requiring sealing under light pressure where bolting force is limited, such as doors, aircraft mounting rings, turbine flanges and combustion chamber inlets. In service, sealing is accomplished by closure against the bulb of the tadpole. This specialized packing is constructed by wrapping heat resistant cores which form the “bulb” with a variety of specially treated cover materials. The edges of the covers are stitched or cemented together, forming the characteristic “tail” structure. Parker offers a variety of styles, materials and configurations in continuous coils and straight lengths.

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  7. Metal Seal Terminology and Profiles

    At Gallagher, we often receive unique requests for challenging projects, and customers who might be intimately familiar with elastomeric seals might have a better fit utilizing metal seals for their application. But, why might someone use a metal seal?

    A metal seal is used when the application conditions are outside the specification limits of a polymer; extreme heat, extreme cold, extreme pressure, or a vacuum. With significant resilience coupled with the right material selection/coating for an application, a metal seal can be a very durable seal performing dependably year after year.

    In order to understand metal seals a bit better, GFS thought it might be worthwhile to discuss metal seal terminology, and different profiles.

    This is a short guide to reference common terms and profiles that may to new to end-users.

    In this blog post, we will discuss the following:

    • Common terms of metal seals
    • Standard formed metal seals
      • O-rings
      • C-Rings
      • Spring energized C-Rings
      • U-Rings
      • E-Rings
      • Metal Wire Rings
      • Axial C-Seal
      • Boss Seal
    But first, let's go over some common metal sealing terms.

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  8. Using Metal Seals for High Temperature or High Pressure Situations

    Article re-posted with permission from Parker Hannifin Sealing & Shielding Team.

    Original content can be found on Parker’s Website and was written by Vivek Sarasam, heavy duty mobile Sr. application engineer, and Jeffrey Labonte, market manager.

    Parker Hannifin Engineered Materials Group has developed a wide variety of metal seals which can be formed or machined. A metal seal is a highly engineered sealing solution which provides elastic recovery or spring back to maintain good sealing, despite separation of mating surfaces due to effects of thermal cycling, flange rotation, applied mechanical or hydrostatic loads or creep.

    Why use a metal seal?

    A metal seal is used when the application conditions are outside the specification limits of a polymer. For example, when:

    Temperature is too hot or too cold & pressure is too high or there is a vacuum.

    Metal Seals are primarily used in static applications for temperatures as high as 1000°C/1832°F and pressures as high as 6825 bar/99000 psi for select applications. At low cryogenic temperatures and low pressures, such as vacuum seal applications, metal seals are far better than polymers since they do not become brittle and lose elasticity. Metal seals also have a low leakage rate down to 1 x 10-12 cc/sec per mm circumference which in comparison to high load O-rings is almost 100x better.

    Medium is corrosive and seal longevity is needed.

    Unlike elastomer seals, metal seals are very highly resilient to corrosive chemicals and even intense levels of radiation. With this resilience coupled with the right material selection/coating for an application, a metal seal can be a very durable seal performing dependably year after year.

    Parker has a variety of in-house developed coatings which are used based on the application conditions and base material. The chart on page D-59 of the Metal Seal Design Guide (shown below) shows examples of some of the coatings based on the base material.

    What X-sections can be made?

    Metal seal x-sections can vary from a solid O to a Hollow O and from a C Ring to an E Ring depending on the application load and allowable leakage rate as shown in the figure below. Each x-section has benefits based on the application use and cost as indicated in the chart below.

    Page A-10 of the Metal Seal Design Guide (shown below) shows some common applications in the industry and the type of metal seal used in those applications. These are examples of applications where the application conditions exceed beyond what an elastomer is capable of handling.

    Importance of surface finish for metal seal applications

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  9. 10 Reasons to Replace Metal Case Rotary Seals with Clipper® Oil Seals

    Article re-posted with permission from Parker Hannifin Sealing & Shielding Team.

    Original content can be found on Parker’s Website and was written by Alan Wiedmeyer, application engineer, Parker Engineered Polymer Systems Division.

    Clipper® Oil Seals are one of the Parker Engineered Polymer Systems (EPS) Division's most widely used rotary seal products. They are an effective solution – especially when used as direct replacements for traditional metal case seals. This is a testament to their precision-molded rubber/aramid fiber heel construction which eliminates the metal case (see image above). In this blog we will review the benefits of using Clipper® seal profiles as direct replacements for metal case seals:

    1. Improved sealing in an imperfect housing

    The composite rubber/aramid fiber heel provides a gasket-like seal for improved sealing against the bore. The surface conditions of bore housings are frequently riddled with imperfections due to damage during improper seal installation and removal, or simply due to cost sensitivity in their original manufacture. Metal can seals lack the ability to conform to such imperfections, frequently necessitating the use of supplemental gaskets or bore sealants during installation to prevent bore leakage.

    2. No need for compression or bore plates

    The outside diameter of the flexible, composite elastomer/aramid fiber heel is slightly oversized to create a tight interference press fit. The tight fit and compression-set-resistant heel construction eliminate the necessity of compression plates for bore retention1. It’s essential to note that bore plates (shown in green) can cost as much as $100 per inch of shaft diameter because of additional part cost and added assembly time.

    3. Corrosion-resistant

    Clipper seals have a composite elastomer/aramid fiber heel and rubber elastomeric lip so there is no concern for rust or corrosion. The only metal component is a 302 stainless steel garter spring. The stainless spring handles higher operating temperatures and resists rust/corrosion better than carbon steel springs used in other rotary shaft seals.

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  10. Sealing at Extreme Low Temperatures

    Article re-posted with permission from Parker Hannifin Sealing & Shielding Team.

    Original content can be found on Parker’s Website and was written by Nathan Wells, application engineer, Engineered Polymer Systems Division.

    Heavy duty equipment moves industry forward in all climates, from the sunny Caribbean to icy Greenland. Effective, reliable sealing is what allows hydraulic systems in heavy duty equipment to do work, no matter the temperature. Reliable sealing solutions allow cylinders on dump trucks and excavators to move icy, frozen tundra, and allow actuators on subsea valves to operate 5,000 - 20,000 feet below the surface of the ocean. We depend on these seals for our safety and productivity, so a little chilly weather is no reason to call it quits.

    What happens to seals at cold temperatures?

    Most objects shrink as they get cold, with few exceptions, such as water. This applies to all matter in the universe. Materials shrink at different rates, and this is a measurable property called the Coefficient of Thermal Expansion (CoTE). Thermoset elastomers and thermoplastics shrink roughly 5 times more than metals for a given temperature change. This means at cold temperatures, seals shrink more than their housings, and thus have less “squeeze” to make a tight seal.

    To make matters worse, elastomers also harden as the temperature drops. At some temperatures, known for each material as its Glass Transition Temperature (abbreviated ‘Tg’), seals become rock hard and brittle … like glass. We don’t make seals out of glass for a reason; they wouldn’t work. In order to keep seals springy and resilient, we need to specify materials with a Tg below the coldest temperature a system will see.

    In very high pressure, low temperature applications, there is one additional concern. Applying pressure to seals effectively raises the Tg of the material by about +1°C per 750 PSI. This is called Pressure-Induced Glass Transition and is the reason high pressure seals fail slightly above their measured Tg.

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