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Two way
Two Way Valve
AL7-Meipa SpA, after long research and experiments, has created a new device, the Two-Way valve that improves the Insulating Glass reliability and solves the very well known problem of the negative effects of pressure and temperature variations on I.G. units.
AL7-Meipa Two-Way valve is inserted through a 6mm hole in the spacer frame, when the I.G. is sealed, the valve becomes an integral part and feature of the I.G. unit.
Under normal conditions the valve remains “shut”, without letting air in or out of the unit, which is totally sealed. However, when the differential between inner and outer pressure exceeds a range of approximately 80 millibar the valve opens, thus allowing an adjustment between the two pressures. When the variation, that caused the valve to open, reaches a range of approximately ± 25 millibar the valve shuts and the unit is perfectly sealed again. We would like to emphasize that our two-way valve does not perfectly balance the I.G. unit pressure, it only allows an adjustment between inner and outer pressure.
Without the AL7-Meipa Two-Way valve, an excessive pressure differential could put the I.G. unit under stress and cause various damage, such as cracks in the glass or loosening of the sealant. These are the reasons why the Two-Way valve is a perfect solution in all those situations where the I.G. unit is produced at a certain altitude and pressure and then transported to a different one (e.g. produced at sea-level and then transported to the mountains) or when the I.G. is sealed with a certain barometrical pressure and then exposed to a different one (e.g. sealed on a sunny day, high pressure, and exposed to bad weather conditions, low pressure). It is very important to remember that, as stated in the laws of physics CHARLES and GAY-LUSSAC, the variations of the inner pressure, in a I.G. unit, are also due to the increase of the gas temperature, (even if the unit is filled with air or other GAS). Infact, the Two-Way valve has an optimal behaviour in GAS fi lled units (such as ARGON, HEXAFLUORIDE, etc.).
The AL7-Meipa SpA Two-Way valve has been tested at ift Rosenheim, in Germany, (Test Report No. 601 22579/2e of July, 06 2000) and fulfi ls the requirements according to DIN 1286 part 1.
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MANUAL PARA OPERAR BARROTILLOS - PALILLOS
28-09-2012 13.11
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Georgian bars
The beginning…
AL7 Meipa srl was the first company to set Georgian grilles inside IG units (1973) and since then, it has been producing them guaranteeing high quality in all production stages: from slitting to packaging.
Environmental protection
In full respect for the environment, AL7 Meipa Srl has banned chromo from the 9 stages pretreatment of aluminium since the end of 90s and does not use any glues nor solvents in foiling Georgian bars.
Style & Design
More than 30 kinds of Georgian bars different in shapes and dimensions allow to meet all aesthetical requirements: ancient and modern balance. With a width from 9 to 45 mm to meet all architectural requirements and a height from 5 to 10 mm for spacers from 6 mm upwards.
Finishes & Foils
Surfaces are powder-coated by extraordinary long-lasting natural pigments with high capacities to stand extended exposure to sunlight and corrosion. Surfaces are anodized by chemical polishing and foils are certified by the most famous quality label organizations of the field.
Quality & Certifications
AL7 Meipa Srl Georgian bars are Qualicoat® & Qualanod® certified, manufactured in accordance with UNI EN 1279 regulation, adjustable to any architectural need, highly resistant at any latitude and climatic zone, and long-lasting. Their linear thermal transmittance is basically null: centesimal (UNI EN 10077).
Architectural restoration of buildings
AL7 Meipa Srl proposes a wide range of solutions of Georgian bars inside insulating glass of doors and windows both for stylish buildings and for architectural restoration of buildings as required by town planning building regulations (RUE).
Georgian style enables window partitions and, for the same decorative effect, more energy conservation than Georgian bars outside insulating glass (EN 14351, annex J).
