News Seals-Shop GmbH
Mar 5 2019
Avoid Seal Damage
Hydraulic seals include piston seals, rod seals, wear rings, scrapers, o-rings, quad-rings, static seals and rotary seals.
- The purpose of the piston seal is to seal in fluid, halting its flow to the piston. This results in the build-up of pressure on one of the piston’s sides.
- Rod seals are the external seals that halt cylinder leakage.
- Wear rings serve to guide both the piston rod and the piston in the cylinder, thereby eliminating metal-on-metal contact.
- The purpose of the scraper is to prohibit cylinder damage by denying access to dangerous contaminants.
- Considered one of the most widely used seals, O-rings are appropriate for both dynamic and static applications, sealing all media.
- Quad-rings are often considered a variation on the traditional O-ring. With its X-shaped cross section, this seal is ideal for both static and dynamic applications.
- Static seals are ideal for sealing applications that do not require movement between sealing surfaces.
- Rotary seals, on the other hand, are used in applications where components are rotating or oscillating.
A breakdown in of any of these units will culminate in inevitable harm to machinery.
Considering the toll on hydraulic seals in hydraulic applications, avoiding hydraulic seal damage becomes a critical matter of selecting the right seal for the right application.
Found in applications ranging from off-highway vehicles, machine tools, trucks and injection molding machines, hydraulic seals need to fit the application and environment for their intended uses.
Here are considerations for making such a determination and, consequently, avoiding hydraulic seal damage.
Different pressure demands will govern different applications. In order to select the right seal, the pressure limit of the application needs to be evident. When considering the pressure needs of the machinery, the first factor to consider is the megapascal (MPa) pressure unit necessary.
Without reliable, quality parts, the cylinder will only be capable of inferior performance, not to mention a shorter service life. That is why hardware is critical to the function of hydraulic systems. A good rule of thumb in selecting a seal is to remember that the better the hardware, the better the seal.
Component design will significantly affect the selection of seals. Governing those design decisions are considerations such as necessary speed, efficiency and compliance with standards and reliability. Knowledge of the installation dimensions also informs the seal selection process.
Some questions to ask when making a seal selection with the goal of avoiding future seal damage:
- Can the seals combat contamination?
- Are the seals low-friction?
- Can the seals be assembled with ease?
- Will the seals be easy to maintain?
- How will the seals perform against temperature extremes and media?
- Are the seals compliant with industry standards?
Seals-Shop, with its variety of seals made from high-quality materials such as Zurcon® or Turcon®, can help make the right seal selection. Seals-Shop offers a variety of hydraulic seals that are durable and that rely on only a minimal amount of maintenance. Additionally, because the seals are compact, they can be installed with ease.
Let Seals-Shop help find the ideal seal for any application using their convenient Product Finder. Need installation help? Each Seals-Shop product description includes an easy-to-follow diagram detailing the installation steps for each specific seal — just another way that Seals-Shop helps to avoid costly seal damage.
Seals-Shop, the official online shop of Trelleborg Sealing Solutions, offers a wide range of hydraulic, pneumatic and mechanical sealing products for a variety of applications. For more information, visit Seals-Shop.com.
Jan 29 2019
How to Convert Imperial Units of O-Rings to Metric Sizes
Sometimes, this can be difficult if a part is metric and the only available seals have Imperial units dimensions, or vice versa. Still, this is not an insurmountable obstacle if an engineer knows the conversions involved. Here are some common seal units and the conversions between metric and imperial units for them.
There are several specifications that are essential to selecting the correct O-ring. The inside diameter, outside diameter and cross section define the dimensions of an O-ring. The inside and outside diameters are the distances from the center to the O-ring’s inside and outside surfaces, respectively. The cross section is the difference between the outer and inner diameters. All three dimensions are typically given in millimeters (mm) for metric O-rings and inches (in) for imperial O-rings.
One inch is equal to 25.4 mm, so when converting from an imperial dimension to a metric dimension, simply multiply by 25.4 mm/in. In order to convert from metric to imperial dimensions, multiply by the inverse of 25.4 mm/in, which is approximately 0.0394 in/mm. Imperial specifications are sometimes given as fractions (such as 1/3”) where the quote symbol after the fraction represents the imperial unit inch. In these cases, the first step is to always convert the fraction to a decimal, then perform the unit conversion. Thus, for example, 1/3” = ~0.33 in = 0.33 in x 25.4 mm/in = ~8.5 mm.
Another important O-ring specification is the maximum pressure rating. Generally, this tends to be expressed in megapascals (MPa) for metric O-rings. Imperial O-rings usually express this specification in units of pound-force per square inch (psi). One MPa is equal to approximately 145 psi. Therefore, to convert the required maximum pressure for an O-ring to imperial units, multiply by 145 psi/MPa. To convert an imperial maximum pressure to MPa, multiply by the inverse, equal to ~.007 MPa/psi. Occasionally, rather than MPa, maximum pressure will be given in bar. A bar is simply one-tenth of an MPa, so the conversion here is simple: 1 bar = 0.1 MPa = 14.5 psi.
Operating temperature range is another important specification that helps one understand whether an O-ring can withstand the environmental challenges of its application. It is therefore very important that a conversion is done correctly when comparing metric and imperial units. Metric O-rings have temperature ranges given in degrees Celsius. Imperial O-rings have operating temperature ranges given in degrees Fahrenheit.
To convert from Celsius to Fahrenheit, use the following formula:
T(°F) = T(°C) × 1.8 + 32
To convert from Fahrenheit to Celsius, use the following formula:
T(°C) = (T(°F) - 32) / 1.8
The specifications of inner diameter, outer diameter, cross section, maximum pressure and operating temperature range are critical to accurately identifying the correct O-ring for an application. Consequently, it is imperative, when confronted by metric or imperial units for these O-rings or their applications, that an engineer is able to convert between the two-unit systems for those specifications. Although the metric and imperial units don’t have to exactly agree, it is a good idea to try to get them as close as possible for optimal O-ring performance and part life.
Seals-Shop, the online shop of Trelleborg Sealing Solutions, offers a wide number of hydraulic, pneumatic and mechanical sealing products for a variety of applications available for immediate shipment in most cases. For more information, visit Seals-Shop.com.
Company information Seals-Shop GmbH
Our customers come from all corners of the industry, including service and maintenance/repair, manufacturing and wholesale distribution. Our products are specifically intended to suit a variety of hydraulic applications, from light-duty linear hydraulic to heavy-duty rotary seals and static applications.
Our broad and diversified product range sets us apart from the rest, notably our extensive selection of FKM seals. On top of everything, all products are immediately available from stock (unless otherwise stated).
|Handelsregister||HRB 757821 Stuttgart|
|Legal form||Gesellschaft mit beschränkter Haftung|
|Type of company||Head Office|
|Fax||+49 711 78648879|
Turcon® is a perfluoroelastomer (FFKM) compound from Trelleborg Sealing Solutions which is matched to the needs of critical sealing environments, combining the media resistance of a PTFE with the elasticity of an elastomer.
Turcite® is dimensionally stable and wear resistant with excellent performance in dry and boundary lubrication.
The engineered plastic based sealing material Zurcon® provides outstanding wear resistance combined with good friction properties, making it suitable for reciprocating, slow rotating and oscillating applications.
HiMod®, a high modulus thermoplastic is suitable for custom molded components, reinforcing rings and Back-up Rings.
The composite bearing material Orkot® consists of technical fabrics impregnated with thermosetting resins and evenly dispersed solid lubricants gives unrivalled performance in dry running conditions.
Key figures Seals-Shop GmbH
Executives Seals-Shop GmbH
Herr Florent Guillomeau
CEO - Chief Executive Officer
Herr Jürgen Bosch
CEO - Chief Executive Officer (Geschäftsführung)
Activities Seals-Shop GmbH
- Service provider
- Moulded parts, rubber
- Rings and washers, rubber
- Diaphragms, rubber
- Packing rings, rubber
- O-rings, rubber
- Rings, rubber, for screw stoppers
- Rings, rubber cord, sealing
- Rings, cellular/foam rubber, sealing
- Rings, rubber, conical, sealing
- Rings, rubber, hexagonal, sealing
- Rings, rubber, flat, sealing
- Rings, rubber, square section, sealing
- Bushes, rubber
- Seals, rubber
- Seals, rubber, for bottles and jars
- Seals, rubber, dam and lock gate
- Rings, rubber, to customer specification
- Tapes and straps, plastic
- Jointings, packings and gaskets, plastic
- Gaskets, ethylene-propylene-diene monomer (EPDM)
- Gaskets, polyethylene (PE)
- Gaskets, polytetrafluoroethylene (PTFE)
- Gaskets, polytetrafluoroethylene (PTFE) filled
- Gaskets, polyvinyl chloride (PVC)
- Gaskets, plastic, for glazing and draught-proofing
- Packing rings, plastic
- Packing rings, vee type, plastic
- Packings, polytetrafluoroethylene (PTFE)
- Oil seals, plastic or synthetic rubber
- O-rings, polytetrafluoroethylene (PTFE)
- Seals, filled polytetrafluoroethylene (PTFE)
- Jointing materials, plastic
- Plastic products, industrial use
- Plastic products for the mechanical engineering industry
- Plastic products for the electrical and electronics industries
- Seals and gaskets, metal
- Packings, metal
- Internal combustion engine components NES
Other classifications (for some countries)
NACE Rev.2 (EU 2008) :
Manufacture of other rubber products (2219)
ISIC 4 (WORLD) :
Manufacture of other rubber products (2219)