Working principle of swing type fluorine-lined check valve

by:Lianke Valve     2022-07-25
Fluorine-lined check valve is an automatic anti-corrosion valve that automatically opens and closes the valve flap to prevent the reverse flow of the medium depending on the flow of the medium itself, also known as a check valve or a one-way valve. For the control of corrosive or highly corrosive media. The surface of the inner cavity of the valve body is covered with various fluoroplastics, which have the characteristics of high strength and good corrosion resistance; it is suitable for different working temperatures and fluid pipelines, and prevents the reverse flow of the medium on various pipelines or equipment. open and close. The valve shaft and valve disc of the swing type fluorine-lined check valve are designed as one body. All shafts lined with fluorine plastic are embedded in the special groove formed between the valve body and the valve cover, which is flexible in opening and closing and reliable in sealing. In addition, in addition to the valve body and the valve disc, the return springs are also lined with corrosion-resistant fluoroplastics, and the springs are properly designed so that the valve disc can also generate sufficient sealing pressure in the low-pressure area, ensuring that the valve is in the low-pressure area. Sealed reliability. Features: All the places where the fluorine-lined check valve can reach the medium adopts the lining process, and the lining material is made of fluorine plastics such as F46 and F3, which can withstand any corrosive medium except molten alkali metal and elemental fluorine, and is suitable for various Concentration of sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua regia and various organic acids, strong acids, strong oxidants and other corrosive media pipelines, but due to the particularity of the lining material, the lining check valve can be used according to the different lining materials. It can be used normally between -20℃~150℃, and it is not suitable for high pressure. Working principle: The fluorine-lined check valve is a kind of automatic valve. The opening and closing parts are automatically opened or closed by the flow of the medium and force. It is mainly used in the pipeline where the medium flows in one direction, and only allows the medium to flow in one direction to prevent the medium from flowing backwards. , Prevent the pump and drive motor from reversing, as well as the discharge of container medium and other accidents. Analyze the use of fluorine-lined check valves. The fluorine-lined check valves are all newly purchased, and the outlet pressure is also satisfied, all above 0.4MP. The check valve is located at the outlet of the water pump. When the water pump is out of operation, the pressure of the pipe network will flow back into the tank after the pump, and the water inlet pressure of the tank is about 0.3MPa. Fluorine-lined wafer check valve? Then, what is the reason why the fluorine-lined check valve cannot stop the water? In fact, the check valve can be said to be leak-proof, as long as the leakage amount is within the specified value, it is qualified, then the above-mentioned check valve cannot stop the water from leaking. The editor concluded that it may be caused by the following reasons : The pressure difference between the front and rear of the check valve is not good, which may cause leakage. Perhaps the valve seat does not return, and the valve seat is sometimes stuck. The spring does not work and the leakage is not large. Or poorly sealed. The direction of installation is wrong, this vertical installation method, if you are not careful, the installation will be reversed, and the valve disc can be opened by its own gravity. It may be caused by the incompatibility between the sealing surface and the rubber. On the side of the pipeline, if the water contains fine sand and gravel, it will affect the reset of the fluorine-lined check valve, and the contact position between the valve core and the valve body is also poorly sealed. In the case of pressure difference, the seal will not be tight.
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