1, the use of door closer requirements and choices
Door closer products must meet the national standard GB9305-88, and the door closers used for fire doors should also meet the requirements of GA93-1995 "Closer Test for Fire Doors".
The factors that should be considered when choosing a door closer are: the weight of the door, the width of the door, the frequency of opening the door, and the requirements for use and use. The weight of the door and the width of the door are the most important factors in selecting the type of door closer. Common doors include fire doors, wooden doors, aluminum doors, glass doors, steel doors, and the like. Usually the weight of the door is small, and the model with less power is selected, and vice versa. The opening frequency is a factor closely related to the quality of the product. For frequent use, the sealing performance of the product should be good and the service life should be long.
Zhejiang Sealand Technology Co., Ltd. is a trustworthy manufacturer of Palm Oil Mass Flow Meter, Palm Oil Mass Flowmeter, Palm Oil Coriolis Mass Flow Meter, Palm Oil Coriolis Mass Flowmeter, Palm Oil Flow Meter, ATEX, IECEx & CE approved.
With its high accuracy, wide rangeability and reliable performance, Sealand meter has been applied in many kinds of industries during the last 8 years. Unlike others who only focus on the measurement of liquid at normal pressure & temperature, Sealand has conquered the difficulty in the measurement under severe conditions, such as high pressure, high viscosity, high & low temperature.
Besides, Sealand lab is
1. Controlled completely by automatic system, to minimize personal error.
2. Equipped with 3 METTLER TOLEDO scales with accuracy 0.014%.
3. Device extended uncertainty: 0.05%.
4. Certified by Zhejiang Institute of Metrology which is authorized by ILAC; Sealand meters are also approved by them after test in their lab with ISO/IEC 17025:2005 standard.
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Zhejiang Sealand Technology Co., Ltd. , https://www.sealandflowmeter.com