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.
Residential Sectional Garage Door,Automatic Metal Sectional Garage Door,Standard Lift Garage Door Drum,Polyurethane Foam Garage Door Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.highspeedshutterdoor.com
1. Scope The technical specifications of this project indicate the minimum requirements for metering pumps, their driving machines and auxiliary equipment for industrial installations. The engineering provisions of the metering pump performance, structural design, materials, drivers, tests, signs, packaging and procurement made provisions. 2. Standards, Codes and Regulations 2.1 In addition to the technical specifications of this project, the standards specified in the pump data sheet (the latest version) shall also be observed, for example: GB9236 metering pump technology; GB7783 metering pump test method; API Positive Displacement Pumps- ControlledVolume). 2.2 When the engineering specifications and specified standards conflict, the engineering provisions shall prevail. At the same time, the seller shall clarify the contradiction to the buyer in written form to remind the buyer to pay attention and solve it. 3. General 3.1 Unless otherwise specified, pumps, drives and their auxiliaries shall be suitable for outdoor start-up and continuous operation at the minimum and maximum ambient temperatures specified. Continuous operating cycle should not be less than 8000 hours. 3.2 The untested prototype can not be accepted, only the actual production of the pump can be accepted. The so-called production verification refers to the pump under similar operating conditions at least two years of safe operation experience. 3.3 Unless otherwise specified, the seller shall provide the entire pump set including pump, coupling, driver and all auxiliary equipment and ensure the quality of the entire pump set. 3.4 Unless otherwise specified, pumps, drives, couplings, shrouds and auxiliary equipment shall be mounted on the same base. 4. PERFORMANCE 4.1 The metering pump should be able to regulate the flow in both operating and non-operating conditions with an adjusted ratio of at least 10: 1 (ie 10% to 100% of the rated flow range) and 25% to 100% Pump stability should be within ± 1% accuracy, linearity and reproducibility accuracy should be within ± 3%. 4.2 Scale or adjust the hand wheel scale accuracy should be higher than ± 0.1% of the indicated accuracy. 4.3 The dosing pump should have a nominal flow rate at least equal to 110% of the maximum (operating) flow rate proposed by the user.