O-Rings - Trelleborg Sealing Solutions - (Version JPG) - Page n° 29 - PDF Catalogue | Technical Documentation

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Pneumatic seal, Scraper, Hose, Static seal, Wear ring

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O-Ring

Trapezoidal groove

The trapezoidal (dovetail) groove should only be used in special cases, e.g. overhead installation, in order to retain the O-Ring (Figure 23). The installation dimensions are summarised in table XIV. The trapezoidal groove is only recommended for O-Ring cross section from 3.53 mm. The inside diameter of the O-Ring results from the mean groove diameter minus the cross section.




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Figure 23 Installation in trapezoidal groove

Table XIV Installation dimensions for trapezoidal groove


O-Ring cross section d2	Groove dimensions
	Groove width b1 ±0.05	Groove width b2 ±0.05	Groove depth h ±0.05	Radius (max.)
	Groove width b1 ±0.05	Groove width b2 ±0.05	Groove depth h ±0.05	r3	r2
3.53 3.55	2.90	3.20	2.90	0.25	0.80
4.00	3.40	3.70	3.20	0.25	0.80
5.00	4.30	4.60	4.20	0.25	0.80
5.33 5.30	4.60	4.90	4.60	0.25	0.80
5.70	4.75	5.25	4.80	0.40	0.80
6.00	5.05	5.55	5.10	0.40	0.80
7.00	6.00	6.50	6.00	0.40	1.60
8.00	6.85	7.45	6.90	0.50	1.60
8.40	7.25	7.85	7.30	0.50	1.60

Rectangular groove

A rectangular groove is preferred for all new designs. Designs with bevelled groove flanks up to 5° are permissible. If Back-up Rings are used, straight groove flanks are necessary.

To reduce risk of extrusion the radius r ideally should not exceed the maximum permissible radial clearance S (see table XII).

Figure 24 Groove specifications

W//A

Latest information available at www.tss.trelleborg.com Edition June 2008

TRELLEBORG

SEALING SOLUTIONS

O-Rings - Trelleborg Sealing Solutions - #29

Pneumatic seal, Scraper, Hose, Static seal, Wear ring