Vacuum breaking valves are mainly used to protect pipelines and equipment from damage under vacuum or negative pressure conditions. Specifically, the vacuum breaking valve is installed above the hump (elevation point) of the siphon type water pipeline. When the pipeline experiences negative pressure, it will open the valve to suck in air and break the vacuum degree, preventing the pipeline from being sucked in.
The structure of a vacuum breaking valve generally consists of components such as the valve body, valve cover, valve stem, valve seat, sealing ring, etc. The opening and closing of valves are achieved through the up and down movement of the valve stem. When it is necessary to adjust the vacuum degree, the control system will send a signal to the vacuum breaking valve to adjust the internal vacuum degree of the system by controlling the opening and closing of the valve.
The advantages of vacuum breaking valves include simple structure, reliable performance, quick action, and convenient installation, which can effectively protect the vacuum system and extend the service life of the equipment. It is widely used in fields such as aerospace, biomedicine, and electronic device manufacturing, such as propulsion systems, oxygen and fuel systems for spacecraft and aircraft, bioreactors and separation equipment, as well as fields that require exhaust or prevent the generation of bubbles during electronic device manufacturing.
At present, various types of vacuum breaking valves have been developed, including pneumatic, electric, and mechanical. Among them, the mechanical vacuum breaking valve has been widely recognized in the market due to its low power consumption, long service life, and timely vacuum breaking.