Parker Engineered Materials Group has developed a wide range of materials for liner seals to meet the demands of the ever increasing temperature requirements in liner seal applications. The new materials exhibit excellent coolant resistance, coupled with design capabilities to provide you a reliable, easy to assemble and efficient product.
Parker has been one of the first in the market to develop a coolant resistant FKM (Viton). Over two decades, these materials have been used in multiple applications providing excellent chemical resistance to coolant, gear lubes, ATF and diesel.
Why do you need a coolant resistant FKM?In applications where the seal is prone to coolant attacks at higher temperature, a coolant resistant FKM is needed. As you can see in the picture below, a coolant resistant FKM will not be as susceptible to cracking and degradation as opposed to a standard FKM.
Coolant Resistant FKM
Standard FKM
Development of CR FKM over the years
Parker has strived to develop the material over the years and has been successful in achieving coolant resistance at higher temperatures. As shown in the chart below, three generations of material development can be seen along with their performance at the higher temperatures.
Some of the common liner seal cross sections are O-rings, D-rings and double chamfer seals. Each x-section has an advantage based on application conditions and production costs.
Benefits of O-rings as liner sealsExcellent functionality
O-rings are industry standard for high pressure sealing
Standard sizes
AS568 through metric sizes available for easy sampling
Easy installation
O-rings are easy to install on standard grooves – constant profile no way to install incorrectly (watch our videos on Male Groove Installation and Female Groove Installation for a quick demo).
Gland design software inPHorm
Lowest cost tools
Benefits of D-rings
Flat ID adds stability
Standard and custom sizes readily available
ID and OD feature combinations
Benefits of double chamfer seals
Flat ID adds stability and can eliminate rolling and spiral failure
Can be used in reciprocating or oscillating and dynamic or static applications where better gland stability is desired
Standard and custom sizes readily available
ID and OD feature combinations
Parts twisting during assembly
Difficult to identify on a large part
Problems during installation of seals
Innovative solution
Paint - clear visual after assembly to show correct installation
PTFE coated parts for ease of installation and Poke-Yoke
In addition, seals can be provided with chamfered or radius edges
For assistance with materials or which liner seal is best for your application, please contact our Applications Engineers via our live chat service on Parker O-Ring & Engineered Seals Division's website.
This article was contributed by Vivek Sarasam, heavy duty mobile senior applications engineer, Engineered Materials Group.
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3 Guidelines to Ensure Proper Seal Installation
Proper Installation of an O-Ring: Standard Male Gland