Parker Symmetrical Seals

Symmetrical Rod Seals

ESP International is your source for a wide range of Parker rod seals to meet the broad demands of the fluid power industry. Parker offers a variety of compounds, materials, and engineered designs for best possible solutions.

Rod seals guard against external leakage and are one of the most vital components of the sealing system. Cutting-edge technologies from Parker include multiple sealing lip systems, shock-load resistance, low friction and ultra-dry capability.

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SPP Profile, Standard PolyPak® Square Cross-Section O-ring Energized Lip Seal

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Parker’s Standard PolyPak is a squeeze seal with a symmetrical profile for use in either rod or piston applications. The standard Molythane® shell provides high wear resistance and the o-ring energizer functions as a spring to maintain sealing contact under low pressure. The Standard PolyPak utilizes a straight cut scraper lip design formed by a precision trimming process. The scraper edge wipes both fluid film and contamination away from the seal. A wide selection of sizes and alternate compounds allow this profile to match up with many hydraulic applications. The Standard PolyPak is an economical choice as a stand alone rod or piston seal. With less squeeze force than the Deep or Type B profiles, the Standard PolyPak can be installed back-to-back, in separate glands, for bi-directional sealing. To protect against pressure trapping, it is recommended that the o-ring be removed from the Standard PolyPak facing the lower pressure side of the application.

Technical Data

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

DPP Profile, Deep PolyPak®, O-ring Loaded Lip Seal with Scraper Lip Design

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Parker’s Deep PolyPak is a squeeze seal with a symmetrical profile for use in either rod or piston applications. Its rectangular shape ensures stability in the gland. The standard Molythane® shell provides high wear resistance and the o-ring energizer functions as a spring to maintain sealing contact under low pressure or vacuum applications. The Deep PolyPak straight cut scraper lip design cuts fluid film and moves contamination away from the seal. The sharp edge of the lip is formed by a precision knife trimming process. A wide selection of sizes and alternate compounds allow this profile to match up with many hydraulic applications. The Deep PolyPak is an economical choice as a stand alone rod or piston seal. Dual Deep PolyPak seals should not be installed back to back in bi-directional piston applications as a pressure trap between the seals may occur

Technical Data

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

BPP Profile, Type B PolyPak® O-ring Energized Lip Seal with Beveled Lip Design

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Parker’s BPP profile, Type B PolyPak is a squeeze seal with a symmetrical profile for use in either rod or piston applications. The rectangular shape of its cross section ensures stability in the gland. The standard Molythane® shell provides high wear resistance and the o-ring energizer functions as a spring to maintain sealing contact under low pressure or vacuum applications. The beveled lip design of the seal is excellent for cutting fluid film and is formed by a precision knife trimming process. A wide selection of sizes and alternate compounds allow this profile to match up with many hydraulic applications. The Type B PolyPak is an economical choice as a stand-alone seal or can be used in tandem with a buffer seal. In piston applications, this seal will function as a unidirectional seal. Dual Type B PolyPak seals should not be installed back-to-back in bi-directional pressure applications, as a pressure trap between the seals may occur. Instead, for bi-directional piston sealing, incorporate a PIP Ring®

Technical Data

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

8400 Profile, Light Load U-cup with Beveled Lips;

8500 Profile, Light Load U-cup with Scraper Lips

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Parker’s 8400 and 8500 Series u-cups are symmetrical lip seals for use in either rod or piston sealing applications. The thin, flexible lip design reacts to low pressure and provides an extremely smooth, steady movement with less breakaway force required because of the inherent low friction. Both the 8400 and 8500 u-cups are produced from the same molds. The 8400 style utilizes a beveled lip, ideal for wiping fluid film, while the 8500 design utilizes a straight cut scraper lip that yields additional lip interference and wipes contamination away from the sealing edge. Both u-cup profiles are available in a variety of rubber compounds to cover a wide range of applications.

Technical Data

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

SL Profile, Dual Compound Dual Lip Seal

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Parker’s SL profile is considered a multiple lip seal. The primary sealing lip is provided by the precision knife trimmed rubber element that snaps into the Molythane® base. The base of the SL profile provides the secondary lip which is aligned directly below the primary lip to provide extrusion, and wear resistance. The SL profile combines the sealing benefit of rubber with the wear and strength of Molythane. The beveled rubber lip geometry is excellent for cutting fluid film and the squeeze forces across the lips maintain sealing contact under low pressure or vacuum. The ability of Parker to supply a variety of rubber compounds allows the SL profile to be compatible with a wide range of pressure, temperature and fluids. The SL profile is designed to work as a stand alone rod seal or can be used in tandem with a buffer seal. In piston applications, this seal will function as a unidirectional seal.

Technical Data

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

US Profile, Symmetrical U-cup Seal

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The Parker US profile is a symmetrical, beveled lip u-cup designed for use in hydraulic cylinder applications. The symmetrical shape allows interchangeability between rod and piston applications. A precision knife trimming process is utilized to create the beveled sealing lips. This ensures that the inside and outside diameter sealing edges provide excellent fluid wiping action. The US profile is a single acting seal. Two seals can be installed back to back, in separate grooves, to seal dual acting pistons without pressure trapping fluid between the seal.

Technical Data

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

AN6226 Profile, Industrial, Standard, Light Load Rubber U-cup

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Parker’s AN6226 Style u-cup has a square format where the nominal cross section is equal to the height. Although widely used in the fluid power industry for low friction pneumatics, this profile was originally designed for early aircraft and ordnance service. Many units still use this type u-cup. The AN6226 profile is available in the most popular sizes per Army/Navy (AN) specifications and is made of a standard 70 Shore A nitrile compound.

Technical Data

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

**Surface Speed for pneumatic applicaions < 3.3 ft/s (1.0 m/s)

ESP International is proud to be one of the few premier distributors to qualify as a “Parker Seal Technology Center (STC)”.

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