Fluorine-lined check valve

Fluorine-lined check valve (also known as fluorine-lined check valve) The function of this type of valve is to only allow the medium to flow in one direction and prevent the flow of the direction. Usually this kind of valve works automatically. Under the action of the fluid pressure flowing in one direction, the valve flap opens; when the fluid flows in the opposite direction, the fluid pressure and the self-coincidence of the valve flap act on the valve seat, thereby cutting off the flow. The fluorine-lined valve adopts the lining process for all the places in the valve body that the medium can reach. The lining material is generally FEP (F46) and PCTFE (F3) and other fluoroplastics, which can be applied to various concentrations of sulfuric acid, hydrochloric acid, and hydrofluoric acid. , Aqua regia and various organic acids, strong acids, strong oxidants and other corrosive media, but the fluorine-lined valve is limited by temperature (only applicable to media between -50°C and 150°C). Among anti-corrosion materials, polytetrafluoroethylene has incomparable excellent performance. In addition to molten alkali metals, elemental fluorine and aromatic hydrocarbons, it is used in various concentrations of hydrochloric acid, sulfuric acid, nitric acid, aqua regia, organic acids, strong oxidants, and concentrated , Alternate dilute acid, alternate alkali, and various organic solvents all react spontaneously. The inner wall of the valve is lined with polytetrafluoroethylene, which overcomes the shortcomings of low strength of polytetrafluoroethylene material and solves the corrosion resistance of the valve body material. Poor performance and high cost. In addition, in addition to excellent chemical stability, PTFE has good antifouling, anti-sticking properties, extremely small and similar dynamic and static friction coefficients, and good anti-friction and lubricating properties. It is used as a sealing pair of valve opening and closing parts. To reduce the friction between the sealing surfaces, reduce the operating torque of the valve, and increase the service life of the product, its use can also be extended to the food and pharmaceutical industries.

1. Purpose of fluorine-lined check valve:

Fluorine-lined check valve is used to prevent the medium from flowing back. By selecting different materials, it can be applied to various media such as water, steam, oil, nitric acid, acetic acid, strong oxidizing media and urea. It is suitable for clean media, not for media containing solid particles and high viscosity.

2. Main material of fluorine-lined check valve:

Carbon steel, low temperature steel, duplex steel (F51/F53), titanium alloy, aluminum bronze, INCONEL625, SS304, SS304L, SS316, SS316L; chromium molybdenum steel, Monel (400/500), 20 #Alloy, Hastelloy and other metal materials.