How do you define an O-ring groove?
Designing the parts of an application where o-rings will be applied is broadly termed “o-ring groove design”. In order to seal properly, the o-ring has to deform in the application by being compressed and stretched in any number of ways.
How do you select O-ring groove size?
Groove Design: O-Ring Seals for Static and Non-Rotary Dynamic Applications
- Calculate the O-Ring groove dimensions. Using the table above, determine the maximum recommended gland depth for your application.
- a. For a rod (shaft) seal:O-Ring Max Groove Diameter = Min Shaft Diameter + (2 x Recommended Gland Depth)
- b.
- c.
How deep should an O-ring groove be?
Cross Section & Groove Design Data
| Available Cross Sections for Encapsulated O-Rings & Groove Design Data | ||
|---|---|---|
| Inch | MM | Groove Depth |
| .063±.004 | 1.60±0.10 | .046 |
| .070±.004 | 1.78±0.10 | .049 |
| .079±.004 | 2.00±0.10 | .057 |
How is an O-ring specified?
There are three Dimensions that you need in order to obtain the perfectly sized O-Ring for your application. These are the Outside Diameter (OD), the Inside Diameter (ID) and the all important Cross Section. Sounds simple and, to be fair, it really is.
What are the different types of O-rings?
Due to many applications, there is also a wide variety of O-ring material choices available. Nitrile (Buna), Neoprene, Ethylene Propylene (EPDM Rubber), Silicone, Fluorocarbon (Viton), and PTFE (Teflon) are among the most commonly used compounds for O-rings and seals.
How much compression should an O-ring have?
Compression should not exceed 3% of the O-ring diameter. Stretch for a smaller O-ring should not exceed 5%.
How much smaller Should an O-ring be?
To provide an effective seal, the O-ring’s inside diameter (I.D.) must be smaller than the piston groove diameter, so that the O-ring is slightly stretched, fitting snugly in the groove. This stretch should be between 1%-5% with 2% as the ideal in most applications. A stretch greater than 5% is not recommended.
How much crush Should an O-ring have?
Is standard for O-ring design?
AS568B STANDARD O-RING GROOVE DESIGN The three main types of standard groove designs are Industrial Static also called Radial, Industrial Reciprocating also called Dynamic, and Face Seals also called Axial or Flange. Radial and Dynamic seals require the presence of a diametrical clearance gap for installation.
Are O-rings sized by ID or OD?
The best way to size an o-ring is by measuring the CS (cross-section) and ID (inside diameter). For measuring the cross-section, it is best to use a caliper, a.k.a. micrometer. If you don’t have one available, various other sizing tools can be used to get a close estimate.
What is an O-ring groove design guide?
These o-ring groove design guides offer default dimensional guidance for basic o-ring groove design applications. Flange/Face Seal A flange or face sealis static and will not have a gap between surfaces, eliminating any design issues associated with extrusion. This is the most straightforward of groove designs.
How much stretch is acceptable for O-ring groove design?
O-Ring Groove Design Guide & Basic Recommendations 1 General rule is 0-5% 2 Excessive stretch can overstress material, thin cross section, and reduces % squeeze 3 % cross section reduction due to stretch about half of the % ID stretch
What is a dovetail groove on an O ring?
DOVETAIL O-RING GROOVE DESIGN Dovetail grooves are used to hold the O-ring in-place on a face seal groove during during assembly and maintenance of equipment. An undercut or dovetail groove has proven beneficial in many applications to keep the o-ring in place.
What are the tolerance limits when designing the groove?
However, when designing the groove, it’s necessary to look at the two extreme cases. First, the o-ring is at its upper tolerance limit and the gland height is at its lower tolerance limit. Secondly, the o-ring is at its smallest cross-section tolerance limit and the gland is at its largest size tolerance limit.