Everything You Need to Know About Flange Check Valves

Flange check valve is a kind of valve that automatically opens and closes the valve disc to prevent the backflow of the medium by relying on the flow of the medium itself. The following is some detailed information about flanged check valves: 1. Definition and function: - Flanged check valves are also known as check valves, check valves, counterflow valves and back pressure valves. - Its main function is to prevent the backflow of the medium, prevent the reversal of the pump and the drive motor, and the drainage of the container media. 2. Structure and classification: - Flanged check valves can be divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis). - Swing check valves have a hinged mechanism and a door-like disc that rests freely on the inclined seat surface. - The disc of the lift check valve slides along the vertical center line of the body. 3. Working principle: - In the process of use, when the medium flows in the specified direction, the valve disc opens under the action of the medium force; When the media backflow, due to the weight of the valve disc and the action of the media reaction force, the sealing surface of the valve disc and the seat are tightly closed, so as to prevent the media backflow. 4. Features and advantages: - The flange check valve has the characteristics of sophisticated material selection, advanced and reasonable sealing pair, complete variety of valve body materials, etc., which can meet the requirements of various pressure, temperature and medium conditions. - Swing check valve fluid resistance is low, suitable for low flow rate and flow does not change often large diameter occasions. - Lift check valve because its disc can be lifted freely, the rest of the part is like the globe valve, the fluid through its channel is also narrow, so the pressure drop through the lift check valve is larger than the swing check valve. 5. Application and performance specifications: - Flange check valve is suitable for petroleum, chemical, pharmaceutical, electric power and other industries in various working conditions of the pipeline, applicable media including water, oil, steam and so on. - The design and manufacture of the product meet the requirements of the American national standard ANSI B16.34 and the American Petroleum Institute standard API6D, and the use of precision casting process casting, beautiful surface quality, internal quality stability. In summary, the flange check valve is an important pipeline equipment, used to prevent the medium counterflow, to ensure the normal operation and safety of the system. When selecting and using flanged check valves, it is necessary to select the appropriate model and material according to the specific use environment and medium.