Capillary Tubes

The application of capillary tube in double glazed units

A capillary tube (sometimes called a “breather tube”) is a narrow tube that is inserted into the spacer between the two panes in a dual-paned window. The capillary tube equalizes the pressure inside and outside the sealed unit.

Generally, both the production and installation of the insulated glass are in the same or very similar latitude range. Under the same conditions, the air pressure in the double glazed unitsis always the same as the external pressure. But when the insulating glass is made at low latitudes such as sea level and then installed at a higher latitude, if we still simply assume that the pressure inside the insulating glass is still the same as the external pressure between the two places, it cannot explain why the two pieces of double glazed units deflect outward, visually deformed, and even the l burst. This is because the pressure inside and outside the insulating glass when the insulating glass is produced is larger than the pressure at the time of mounting at a high latitude. If the pressure difference is too large and exceeds the strength of the glass itself, the hollow glass may be broken/or the structural rubber of the insulating glass may be broken, resulting in premature failure of the sealing of the insulated glass. The traditional way to solve this problem is to install a breathing tube or capillary tube on the sealing edge of the insulating glass. The function of the breathing tube and capillary tube is to continuously adjust the difference between the pressure in the air layer of the double glazed units and the external atmospheric pressure as the height changes, so that it achieves dynamic equilibrium.www.tjxydkj.com