The fluorine-lined globe valve
is used as a cut-off medium. When it is fully opened, the entire flow is straight, and the pressure loss of the medium is small at this time. The fluorine-lined globe valve is usually suitable for the working conditions that do not need to be opened and closed frequently, and keep the gate fully open or fully closed. Not intended for use as regulation or throttling. For high-speed flowing media, the gate can cause vibration of the gate when it is partially opened, and the vibration may damage the sealing surface of the gate and the valve seat, and the throttling will cause the gate to be eroded by the medium. In terms of the form of the structural pneumatic lined globe valve, the main difference is the form of the sealing element used. According to the form of the sealing element, the fluorine-lined globe valve is often divided into several different types, such as: wedge-type globe valve, parallel globe valve, parallel double-gate globe valve, wedge-type double-gate gate, etc. Commonly used forms are wedge globe valves and parallel globe valves. Fluorine-lined globe valve adopts fluoroplastic lining technology, and the valve body adopts investment casting, which has high strength and smooth appearance. Corrosive pipelines and pipelines of any concentration work. However, it should be emphasized that the fluoroplastic-lined globe valve is strictly prohibited from being used for flow adjustment, so as to avoid the high-speed medium flow at the orifice from eroding and destroying the sealing surface. Innovation point 1 of the fluorine-lined globe valve: The shape of the arc-curved flow passage of the old globe valve body has been changed, and the linear structure is adopted, the bottom of the valve body is smooth, and the medium has no place to stay, which fully meets the industrial production hygiene requirements of the food and pharmaceutical industries. In the chemical industry, for the working conditions where the medium often needs to be changed, since there is no residual liquid, the purity of the medium is improved, which is beneficial to the guarantee of the quality of chemical products. This flow channel is beneficial to the processing of the lining layer. Innovation point 2 of the fluorine-lined globe valve: the sealing surface is sealed with a conical surface, so that no impurities will stay on the sealing surface, and the sealing life is longer than that of a flat seal; with a conical surface sealing, the flow rate can show a linear proportional relationship, which can be used to adjust the flow rate. Innovation point 3 of the fluorine-lined globe valve: According to the user's special working conditions, the lining layer can be sprayed with Al2O3 nano-ceramic powder. The sprayed nano-ceramic layer overcomes the defects of sintered ceramics. The corrosion resistance and wear resistance of this product are greatly improved, and the working temperature can reach 425 ℃. The service life of this new type of lined globe valve is 5 to 10 times longer than that of ordinary stainless steel valves. Fluorine-lined globe valve has the advantages of compact structure, flexible opening and closing, strong corrosion resistance, short stroke (generally 1/4 of the nominal diameter), etc. It is widely used in petroleum, chemical and other pipeline systems to cut off media, but it needs It is emphasized that the fluoroplastic-lined globe valve must not be used for flow adjustment, so as to avoid the high-speed medium flow at the orifice from eroding and destroying the sealing surface. The fluorine-lined globe valve is a forced-sealing valve, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters valve six from below the valve disc, the resistance that the operating force needs to overcome is the friction force between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the valve The diameter of the stem should be large, otherwise the failure of the top of the valve stem will occur. In recent years, since the emergence of self-sealing valves, the medium flow direction of the fluorine-lined globe valve has been changed from the top of the valve disc into the valve cavity. At this time, under the action of the medium pressure, the force to close the valve is small, while the force to open the valve is large. The diameter of the rod can be reduced accordingly. At the same time, under the action of the medium, this form of valve is also tighter.
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