Lens ring seal

The well-known option of a lens ring seal has therefore either bigger outer dimensions than the tube or a protrusion of the ring (Figure 12.16, left). Thus, these seals have almost the same radial expansion as the tubes around them. It is also essential to put symmetrical load on both sides of the lens seals because otherwise there is a danger of tilting and wearing as a consequence. 

Union Connectors. CoUar and cone-type connectors (Figs. 26a and b) are nearly always used to connect smaU bore tubes at pressures up to about 400 MPa (140). The included angle of the end of the tube is 55—57° and that of the seat 60—61° so that when the gland nut is tightened into the connector a metal-to-metal seal is formed along a narrow band of contact between the end of the tube and the connector. Union connectors for smaU bore tubes at pressures of 500 MPa and above usuaUy employ lens rings. 

Figure 12.10 Lens ring gasket, sealing element, and adjacent parts.

The design concept with totally metallic, such as lens seal rings, is found to be safer and more practicable. The conical joint with cap nut (Fig. 4.2-1 E) can be used for small nominal pipe... 

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