Sealing Shielding

How to Calculate the Right O-Ring Size with the Parker O-Ring Selector

Parker O-Ring Size SelectorTwo things are equally important for the reliable performance of an O-ring seal: the right size and the right material. Parker’s new O-Ring Selector is an engineering design tool that enables users to make the right material and size selections easily, quickly and reliably – in a single application. This post explains how to design the sealing system using the “Size Selector.”

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Einbausituation praezise kalkuliert - O-ring size selector

Precise calculation of installation conditions: fast and easy with the “Size Selector”

The “Size Selector” calculates the installation conditions and the suitable O-ring. It is divided into three segments: “Hardware Configuration,” “Sizing Selection” and “Results” (of the calculation).

 

Description of the system to be sealed

The “Hardware Configuration” segment is used for a detailed description of the sealing system. The user can choose between two radial (Piston und Rod Seal) and two axial (Internal and External Pressure) sealing systems. Subsequently, these choices can be specified in greater detail by selecting liquid systems or gas/vacuum systems. The selection of the various options is intuitive due to the clear, graphic presentation of the individual sealing systems. 

“Hardware Configuration” also includes a look at the diverse thermal expansion coefficients of the hardware components. Representative values, e.g. for steel or aluminum, are available here. Of course, if known precisely, these values may also be entered manually to parameterize the sealing system with maximum accuracy. Chemical swelling of the seal itself may be included in the calculation as well.

Parker Prädifa Description of the System to Be Sealed

 

 

 

 

 

 

 

 

Calculation of the sealing system

The “Sizing Selection” segment is focused on the comprehensive calculation of the system to be sealed. If known, all values such as O-ring diameter, piston diameter, etc. can be entered manually. Alternatively – if complete information is not available – an automatic parameterization of the sealing system can be performed via the selection of the O-ring diameter and (for instance) the targeted piston diameter. All the individual values calculated this way can be adjusted manually in a second step and their effects on the functionality of the sealing system reviewed. The toleration of the hardware components can be adjusted to the user’s application as well to satisfy the various quality requirements in the manufacturing process.

Parker Prädifa Calculation of the Sealing System

 

 

 

 

 

 

 

 

 

 

 

 

Review of results

The “Results” segment displays the calculated results in a structured manner. For the key results parameters, the recommendations are shown according to ISO/Parker specifications. In addition, minimum and maximum tolerations for the results parameters are indicated. A simple visual check if the calculated sealing system corresponds to ISO/Parker recommendations is made using color codes: green stands for “Recommended,” yellow for “Warning” and red for “Critical.”  

Parker Prädifa Review of ResultsUsers can enter their own comments on the calculations made in “Notes.” After the review of the sealing system has been completed, the data obtained can be converted into a PDF.

 

 

O-Ring Selector

 

 

 

 

 

 

>>> Start imperial version
>>> Start metric version

 

 

Additional information:

 

 

Heinz Christian Rost

 

 


Article contributed by Dr. Heinz-Christian Rost
Technology & Innovation Manager
Engineered Materials Group Europe, Prädifa Technology Division

 

 

Related, helpful content for you:

O-Ring Selection Made Easy with the Parker O-Ring Selector

How to Select the Right O-Ring Material with the Parker O-Ring Selector

 

 

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