Precision seals for pneumatics
Parker-Prädifa pneumatic seals are the result of decades of experience in materials and profile development. For the pneumatics design engineer, they open up new methods and design techniques, such as properties which give them optimal friction conditions and enable them to retain a lubricating film with the use of lip seal geometry.
Users have an entire range of sealing systems for pneumatic cylinders at their disposal: Rod seals and scrapers, single- and double-acting piston seals, complete pistons with and without mechanical damping buffers, damping rings and combined sealing scraper rings for ISO and short-stroke cylinders.
Parker-Prädifa also offers a wide range of products for custom applications. However, only a portion of them are presented in this catalog: Sealing scraper elements for rotation-proof cylinders, oval double-acting piston seals for flat cylinders, rubberized fiber web seals for cylinders without a piston rod, and special sealing scraper elements for especially high amounts of dirt.
Rod seals
The rod seal profile E5 is a lipped ring that has been developed specially for pneumatic applications. The dimensions of the standard series profile E5 correspond to the rod diameters according to ISO 3320 and/or CETOP RP 51 P, and are interchangeable with the standard series of the C1 profile, which used to be popular in pneumatic applications.
The rod seal Z9 is a lipped ring that has been developed specially for pneumatic applications.
The rod seal profile C1 complies with the requirements of manufacturers of hydraulic and pneumatic devices for seals that require the smallest possible installation space. Outstanding sealing properties are achieved with the smallest possible profile width and height.
Extremely low friction thanks to minimal contact with sealing surface. Support rings or brackets are not required due to the special design.
Use in pneumatic devices is only possible if lubrication is constantly supplied; e.g. via lubricated air. For installation in oil-free pneumatic systems (dry air), we recommend our profile E5, which fits into the same installation spaces.
The self-locking, sealing scraper ring EU for piston rods of pneumatic cylinders simultaneously fulfills three functions: Sealing, scraping, and fixing in position.
The self-locking, sealing scraper ring E7 is the variant of the profile EU for extreme operating conditions with regard to thermal and chemical resistance and dry running. The sealing element simultaneously fulfills three functions: Sealing, scraping, and fixing in position.
The self-locking, pneumatic sealing scraper ring profile E8 for piston rods of pneumatic cylinders simultaneously fulfills three functions: Sealing, scraping, and fixing in position.
The split design of the seal kit allows for optimal adjustment of the materials to the requirements of the individual component (scraper and/or seal).
The sealing scraper ring E9 for piston rods of pneumatic cylinders is the high-temperature variant of the profiles E8 and EU.
The pneumatic sealing scraper ring profile EL is a proven and tested combination element for piston rods of small pneumatic cylinders and valve tappets.
The self-locking, pneumatic sealing scraper ring ET for flat piston rods of rotation-proof pneumatic cylinders is the oval counterpart of the round standard profile EU. It simultaneously fulfills three functions: Sealing, scraping, and fixing in position.
The self-locking, pneumatic sealing scraper ring for flat piston rods of rotation-proof pneumatic cylinders is the oval counterpart of the round standard profile EL. It simultaneously fulfills three functions: Sealing, scraping, and fixing in position.
The pneumatic sealing scraper ring and guide element profile EP for piston rods of pneumatic cylinders simultaneously fulfills three functions: Sealing, scraping, and fixing in position.
The single-acting piston seal kit profile OD consists of a PTFE rod sealing ring and an elastomer O-ring as a preloading element.
The asymmetric cross-section of the sealing ring has been designed for the optimal circulation of trailing lubricant during the stroke in both directions. An optimal seal is achieved by installing it in a tandem arrangement in combination with a double scraper ring.
Profile OD is particularly suited to piston rods in master cylinders, server-driven systems, machine tools and rapid closure cylinders. The seal kit has also been implemented successfully in the automobile industry (e.g. in shock absorbers) and the process manufacturing industry.
Due to the combination of materials used in the sliding ring (PTFE) and the O-ring (elastomer), this product is suitable for a wide range of applications, in particular for aggressive media and/or high temperatures. A comprehensive selection of materials is available for individual application profiles.
Piston seals
The piston seal profile E4 is a lipped ring that has been developed specifically for pneumatic applications. The dimensions of the standard series profile E4 correspond to the cylinder diameters according to ISO 3320 and/or CETOP RP 52 P, RP 43 P and RP 53 P. They are interchangeable with the standard series of the C2 profile, which used to be popular in pneumatic applications.
The piston seal profile E4 is a lipped ring that has been developed specifically for pneumatic applications. The dimensions of the standard series profile E4 correspond to the cylinder diameters according to ISO 3320 and/or CETOP RP 52 P, RP 43 P and RP 53 P. They are interchangeable with the standard series of the C2 profile, which used to be popular in pneumatic applications.
The piston seal profile Z8 is a single-acting lipped ring for sealing off pistons in pneumatic cylinders and valves. It is characterized by its compact size. The standard series profile Z8 corresponds to the cylinder diameters according to ISO 3320 and/or CETOP RP 52 P, RP 43 P and RP 53 P.
The piston seal profile Z8 is a single-acting lipped ring for sealing off pistons in pneumatic cylinders and valves. It is characterized by its compact size. The standard series profile Z8 corresponds to the cylinder diameters according to ISO 3320 and/or CETOP RP 52 P, RP 43 P and RP 53 P.
The piston seal profile C2 complies with the requirements of manufacturers of hydraulic and pneumatic devices for seals that require the smallest possible installation space. Outstanding sealing properties are achieved with the smallest possible profile width and height.
Extremely low friction thanks to minimal contact with sealing surface. Support rings or brackets are not required due to the special design.
Use in pneumatic devices is only possible if lubrication is constantly supplied; e.g. via lubricated air. For installation in oil-free pneumatic systems (dry air), we recommend our profile E4, which fits into the same installation spaces.
The PDF-Ultrathan® piston seal profile MK is a seal with an integrated guiding ridge and damping buffers. The sealing guide element can be used on pistons, both with and without a permanent magnet. When used in a magnetic piston, the sealing guide element encapsulates the permanent magnet.
The pneumatic piston seal profile Z5 is a double grooved ring with a guiding ridge for pistons impinged alternately on both sides.
The pneumatic piston seal profile PZ was developed for sealing off pistons in pneumatic cylinders and in valves. The piston seal, which can be impinged on both sides with the use of pressure, is characterized by its compact installation dimensions.
The double-acting piston seal kit profile OA consists of a PTFE rod sealing ring and an elastomer O-ring as a preloading element.
Profile OA is particularly suited for pistons impinged on both sides, e.g. in control cylinders, servo-controlled systems and rapid closure cylinders.
The double-acting piston seal kit profile OC consists of a PTFE rod sealing ring and an elastomer O-ring as a preloading element.
Profile OC is particularly suited for pistons impinged on both sides, e.g. in control cylinders, servo-controlled systems and rapid closure cylinders.
The single-acting pneumatic complete piston profile EK is a cup packing with a vulcanized metal disk as a supporting component and fulfills two functions: Sealing and guiding.
The single-acting pneumatic complete piston profile DE is a cup packing with a vulcanized metal disk as a supporting component and fulfills three functions: Sealing, guiding, and damping.
The double-acting pneumatic complete piston profile DK is a cup packing with a vulcanized metal disk as a supporting component and fulfills two functions: Sealing and guiding.
The double-acting pneumatic complete piston profile DP is a cup packing with a vulcanized metal disk as a supporting component and fulfills three functions: Sealing, guiding, and damping.
Other seals
The scraper rings A2 serve to prevent the ingress of dust, dirt, grains of sand and metal filings in dynamic rod guides. This is achieved through their special shape. This allows them to prevent the formation of grooves to a large extent, protect the guide components and extend the service life of the seals. The A2 scrapers were developed specially for pneumatic devices that are operated with dry and oil-free compressed air. In order to ensure error-free functioning, an initial lubrication is to be carried out before assembly.
The pneumatic damping ring, profile PP, seals off damping pistons in pneumatic cylinders.
The pneumatic damping ring, profile PP, seals off damping pistons in pneumatic cylinders.
The pneumatic damping ring, profile V6, seals off damping pistons in pneumatic cylinders.
The PTFE guide strip profile F2 is intended specifically for use in pneumatic cylinders.
Ultrathan® O-rings are made of a polyurethane material (Thermoplast) developed by Parker, which possesses an excellent compression set.
It is only with this low compression set that the manufacture of polyurethane O-rings became possible. A polyurethane O-ring is more extrusion-resistant than standard O-rings, which makes its use advantageous in situations where extremely high and/or intermittent pressures may occur, or where there is no space for a back ring.