News

Home page

全部分类

Fire damper selection function joint surface leakage factor of valve body

Release Time：2021-07-21

Fire valve practical selection role.
Fire damper: installed on the air supply and return pipelines of ventilation and air conditioning systems, it is usually open. When the gas temperature in the pipeline reaches 70 ℃ in case of fire, the fusible sheet will fuse and the valve will automatically close under the action of torsion spring force. It can meet the requirements of fire stability and fire integrity within a certain period of time. It will output a closing signal when the valve is closed.
Smoke fire damper: installed in the exhaust system pipeline, usually closed state, fire damper fire manual or electric open, play the role of smoke. When the flue gas temperature in the exhaust pipe reaches 280 ℃, it is closed, which can meet the requirements of fire stability and fire integrity within a certain period of time, and plays the role of smoke exhaust valve.
Installed in the central air-conditioning air duct system, the working principle is the temperature control of the extremely fusible alloy. The valve is closed by the action of gravity and the action of the spring mechanism. When a fire occurs, the flame invades the air duct, and the high temperature melts the fusible alloy on the valve. Or make the memory alloy deform to make the valve automatically close the fire valve, which is used for occasions where the air duct and the fire zone run through.
Fire damper, fire control valve, normally open, 70 degrees closed, generally installed in the air duct through the firewall, the role of fire shutdown, you can set the output signal, smoke sense more than 70 degrees when the valve is closed, chain (supplement) fan closed.

Fire control valve body joint surface leakage factors:
First, the bolt tightness of the joint surface cannot be tightened or biased, which constitutes a poor sealing of the joint surface. The elimination method is to adjust the bolt tightness. When tightening the bolt, the fire damper must be tightened diagonally. It is best to measure the vacancies everywhere while tightening, tighten the bolts to stop, and make the joint surface with the vacancies everywhere.
Second, the tooth-shaped gasket on the joint surface of the valve body does not conform to the specifications. For example, the tooth-shaped gasket has fine groove marks in the radial direction, poor parallelism, and defects such as tooth-shaped over-sharp or over-slope will all constitute sealing failure, thus causing the joint surface of the valve body to leak. During maintenance, the quality of spare parts should be controlled and the tooth-shaped gasket conforming to the specifications should be selected to prevent the occurrence.
Shandong Xingheng Environmental Technology Group Co., Ltd. is located in Luquantun Development Zone, Dezhou, Shandong, the hometown of FRP in China. The company has Grade II qualification for fire protection facilities engineering, Grade II qualification for construction mechanical and electrical installation engineering, Grade II qualification for environmental protection engineering, and safety production license. It is the first in the industry to pass ISO9001 quality management system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health management system certification, and an axial fan invention patent, A fan utility model patent, environmental assessment, safety assessment, three simultaneous and other procedures are complete.