Residential Sectional Garage Door
A typical version of an overhead garage door used in the past would have been built as a one-piece panel.The panel was mounted on each side with unequal parallelogram style hinge lifting mechanism. Newer versions of overhead garage doors are now generally built from several panels hinged together that roll along a system of tracks guided by rollers. The door is balanced by either a torsion spring system or a pair of extension springs.A remote controlled motorized mechanism for opening garage doors adds convenience, safety, and security
• Aluminum garage doors are low-cost, light, rust-proof, and feature low-maintenance. They are prone to denting because aluminum is not strong and they are energy-inefficient since aluminum is a highly conductivematerial.
• Fiberglass and vinyl garage doors are composite units, combining a steel core behind a fiberglass or vinyl skin. They have also polyurethane insulated base sections, or other type of foam insulation. These premium doors can match steel garage doors, and be a realistic imitation of wood (namely fiberglass units), but they may be more expensive than steel units.
• Steel doors have become common and are available in a variety of sizes and styles, provide strength and security, are cost-competitive, and may have optional insulating value. Extra strength is available with two or three layers of galvanized steel with a low gauge number (23-24 gauge steel panels).
• Wood garage doors offer aesthetic appeal, but they are high-maintenance and may be expensive. Low-priced wood garage doors may warp and break easily.
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Milton-Law company in the metering pump technology has been in a leading position, also occupy a considerable domestic market share. The high-performance diaphragm pump head uses the Milton-Laws patented MARS technology (Automatic Mechanical Charge System) that combines the advantages of a variety of traditional pump heads. The high-performance diaphragm pump head eliminates the material-side disk diaphragm guard required for conventional hydraulic diaphragm heads, allowing the pump head to have both the "direct through" nature of the tubular diaphragm and the low NPSH (positive net suction pressure Head) requirements and other performance, but also effectively protect the diaphragm, to extend the life of the diaphragm, and to avoid the traditional metering pump head accuracy may change with the use of time weaknesses.