We receive many requests regarding seal retention but why is it so important? There are 3 main reasons: ease of component assembly, serviceability, and transit issues. For example, seal retention is important when you have complex groove paths where your groove wanders around bolts or ports. It is also valuable in improving operator ergonomics by reducing installation strain or fatigue in high volume applications. Additionally, seal retention improves serviceability by eliminating the need for liquid sealants which can be difficult to clean. Last but not least, seal retention resolves transit issues by ensuring seals are retained from workstation to workstation or if components are assembled in different locations.
Parker offers an array of Press-in-Place (PIP) Seals to accommodate these application challenges. Additionally, each particular profile provides performance properties to address issues like larger tolerance stock, low seal load, and complex groove paths to name just a few.
Parker’s Press-In-Place (PIP) seals are custom designed to fit into complex groove patterns without having to be stretched. These custom seals are designed to withstand a wide variety of environments, fluids, pressures and temperatures.
In comparable seal heights, a standard PIP groove is 60 percent narrower than traditional grooves. Seal retention is achieved by sidewall interference, requiring no adhesives. The PIP design also maintains high pressure differentials, provides lower seal load, optimizes material use and is easy to install.
Compared to dispensed Form-In-Place (FIP) seals, PIP seals have several advantages. For example, during maintenance, PIP seals can be easily and quickly changed out, where FIP removal often damages the groove. FIP seals also require a considerable investment in machines and fixtures while PIP seals deliver higher performance and robustness without expensive tooling or fixture costs.
Parker offers a variety of PIP standardized profile options. These include:
Other retention options include: Friction Fit Hollow O; Friction Fit Hollow Profile; PSA on Profile; Dart Profile in Custom Groove; Dart Profile in FF Groove; Hollow Profile Mechanically Fastened; PSA on Hollow D; and Hollow Profile Pressed into Metal Track.
A full summary of our PIP options with performance properties and our recommendations are provided in our Press-In-Place (PIP) Sealing webinar below. For help in determining the right solution for your application, please contact our O-Ring & Engineered Seals design team at OESmailbox@parker.com or 1-859-335-5101.
This blog was contributed by Samantha J. Sexton, marketing communications manager, Parker O-Ring & Engineered Seals Division.