Zatkoff Offers Incredible Inventory of Parker PolyPak Seals

April 28, 2021

Parker's Symmetrical PolyPak® Seal is a patented precision molded multi-purpose seal that combines an o-ring type synthetic rubber o-spring with a conventional lip-type seal to produce a unique sealing device capable of sealing in both vacuum and high and low pressure applications. At Zatkoff Seals & Packings, we offer an incredible inventory of PolyPak® Seals, with the largest stock of PolyPaks® in the United States. Offering nearly 200,000 in-stock standard P4615A90 Molythane parts, our inventory is hugely advantageous for our customers.

PolyPak® Advantages

The Parker PolyPak® offers a clear advantage over conventional lip seals, such as the standard u-cups, that are prone to leakage under low pressure, due to the fact that little or no lip loading is inherent in the basic seal design . PolyPak® is a squeeze type seal that provides high sealability at low pressure. As system pressure increases, additional force is applied to the PolyPak's® interface and as continued pressure increases, lip loading is automatically increased to compensate for the higher pressure, thus maintaining a positive, leak-free seal.

For additional information regarding the advantages of the PolyPak® seal, please visit the catalog for Rod & Piston SPP, DPP, and BPP PolyPak® Seals.

Types of PolyPak® Seals

PolyPak® Seals are offered in three styles or profiles that offer varying advantages. All three types of the PolyPak® Seals are squeeze type seals with a symmetrical profile for use in either rod or piston applications. A wide variety of sizes and alternate compounds allow these profiles to match up with many hydraulic applications.

Standard PolyPak® (SPP Profile)

Zatkoff offers over 700 sizes in stock

  • Standard Molythane shell provides high wear resistance while the o-ring energizer functions as a spring to maintain sealing contact under low pressure
  • Scraper edge wipes both fluid film and contamination away from the seal
  • Economical choice as a standalone rod or piston seal
  • Less squeeze force than the Deep or Type B profiles, allowing Standard PolyPaks® to be installed back-to-back, in separate glands, for bidirectional sealing
  • It is recommended that the o-ring be removed from the Standard PolyPak® facing the lower pressure side of the application to protect against pressure trapping

Deep PolyPak® (DPP Profile)

Zatkoff offers over 400 sizes in stock

  • Rectangular shape that ensures stability in the gland
  • Standard Molythane shell provides high wear resistance while the o-ring energizer functions as a spring to maintain sealing contact under low pressure or vacuum applications
  • Scraper lip design cuts fluid film and moves contamination away from the seal
  • Economical choice as a standalone rod or piston seal
  • Should not be installed back-to-back in bidirectional piston applications to avoid pressure trap
  • If a back-to-back configuration is used, it is recommended that the o-ring be removed from the Deep PolyPak® facing the lower pressure side of the application to protect against pressure trapping

Type B PolyPak® (BPP Profile)

Zatkoff offers nearly 600 sizes in stock

  • Rectangular shape that ensures stability in the gland
  • Standard Molythane shell provides high wear resistance while the o-ring energizer functions as a spring to maintain sealing contact under low pressure or vacuum applications
  • Beveled lip design is excellent for cutting fluid film
  • Economical choice as a standalone seal, or can be used in tandem with a buffer seal
  • In piston applications, this seal will function as a unidirectional seal. For bidirectional piston sealing, incorporate a PIP ring
  • Should not be installed back-to-back in bidirectional piston applications to avoid pressure trap

PolyPak® Sealing Solutions

With Zatkoff's large inventory of in-stock parts, our expert engineers are able to offer huge advantages for our customers. Contact us today to request more information about the Parker PolyPak® Seal applications and advantages.

Social

More News

3M™ Ultra Clear Double Coated Tapes UCT-30 and UCT-50 both come with a polyester (PET) carrier as well as two PET liners for dimensional stability. As a 3M™ Select Converter, Zatkoff Manufacturing converts and laminates this product to various substrates.

Read More

As an early, proactive response to the global supply chain crisis that manufacturers are facing, Zatkoff has strengthened our inventory to over $25 million. Learn how our boosted safety stock and valued employees have successfully safeguarded our processes and ensured that our customers can maintain operational continuity.

Read More

SKF CR Seals® are known for their outstanding performance across many applications, and have one of the longest histories in the sealing industry. Zatkoff Seals & Packings is an SKF Seals Distributor, offering a comprehensive line of catalog and custom parts in a variety of materials and coordinated engineering support.

Read More