Classification of Check Valves
Check valve products, classification is also very detailed:
1 in accordance with the structure, it can divided into lift check valve, swing check valve and butterfly valve, diaphragm valve, the corresponding products are: pressure from the tight seal lift check valve, swing check valve, flange butterfly valve buffer.
(1) the pressure tight seal lift check valve structure is generally similar to the cut-off valve, the valve flap along the line for the lifting movement, reliable action, but the fluid resistance is large, suitable for light and small caliber occasions. Lift check valve can be divided into straight through lift check valve and vertical lift check valve.
(2) swing type flange check valve disc is rotated around the shaft, the fluid resistance is generally less than the lift check valve, it is suitable for large caliber occasions. Its applicable media include water, steam, oil, nitric acid, strong oxidizing medium, urea, etc..
Sanitary check valve is widely used in power plants, petroleum, chemical, pharmaceutical, food and other industries, can be directly used with imported equipment. Swing check valve according to the number of disc can be divided into single swing type, double valve swing and multi disc swing type three. Single swing check valve is generally applicable to medium caliber occasions. Large diameter pipeline single swing check valve, in order to reduce water hammer pressure, it is best to use to reduce the water hammer pressure slow closing check valve. Double disc swing check valve is suitable for medium and large diameter pipeline. Double disc swing check valve structure is small, light weight, is a rapid development of the check valve; multi disc swing check valve for large diameter pipeline.
(3) butterfly check valve structure is similar to sanitary butterfly valve. The structure is simple, the flow resistance is small, and the water hammer pressure is small.
(4) diaphragm type check valve has a variety of structural forms, the diaphragm is used as the opening and closing parts, because of its good performance, simple structure and low cost, the water hammer has developed rapidly in recent years. However, the use of diaphragm check valve temperature and pressure by the diaphragm material restrictions.
2 according to the main material, it can be divided into cast iron check valve, brass check valve, stainless steel check valve, etc., the corresponding products are H64W brass welding swing check valve, vertical pure nickel check valve, check valve, etc..
3 in accordance with the function, it can be divided into silent check valve, Muffler check valve, etc., the corresponding products of our company have Muffler check valve, brass on the clip, such as noise check valve.
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