fluorine lining gate valve

Basic knowledge of fluorine-lined globe valve

by:Lianke Valve     2022-08-29
This time, I will introduce the basic knowledge about the fluorine-lined globe valve and some features and advantages, and let you know the unknown fluorine-lined globe valve. The fluorine-lined globe valve is a forced-sealing valve. When the valve is closed, pressure must be applied to the valve disc to forcibly prevent the sealing surface from leaking. When the medium enters the valve from under the valve, the resistance overcome by the operating force is the thrust generated by the wear force of the valve and the gasket and the pressure of the medium, and the force to close the valve is greater than the force to open the valve, so the diameter of the valve stem is larger. Otherwise, the failure of the top of the valve stem bending will occur. With the advent of self-sealing valves, the flow of valve media was altered to enter the cavity of the valve from above the valve. At this time, due to the influence of the dielectric pressure, the force to close the valve is small, but due to the large force to open the valve, the diameter of the valve is correspondingly reduced. Also, this shape of the valve is also critical in the action of the dielectric. When the fluorine-lined globe valve is opened, when the opening height of the valve disc is 25% to 30% of the nominal diameter, the flow rate has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the fully open position of the globe valve should be determined by the stroke of the valve disc. The fluorine-lined globe valve has the following advantages: 1. The structure is simple, and the manufacture and maintenance are more convenient. 2. The working stroke is small and the opening and closing time is short. 3. Good sealing performance, small friction between sealing surfaces and long service life. No matter what it is, there are advantages and disadvantages, and the fluorine-lined globe valve is no exception: 1. The fluid resistance is large, and the force required to open and close is large. 2. Not suitable for medium with particles and high viscosity. 3. Poor adjustment performance. Structural features of the fluorine-lined globe valve: 1. Compared with the gate valve, the globe valve has a simpler structure and is more convenient to manufacture and maintain. 2. The sealing surface is not easy to be worn and scratched, with good sealing performance and long service life. 3. When opening and closing, the valve flap travel is small, the opening and closing time is short, and the valve height is small. 4. The valve disc and the valve stem are designed as one structure, which is compact and safe to use. The fluorine-lined globe valve has three structural forms: 1. Straight-through, direct-current, and angle-type, among which the straight-through is the most commonly used. The angle-type can be installed at the corner of the pipeline system, and the direct-current flow resistance is the smallest in the globe valve. 2. Configure pneumatic and electric devices according to user needs to meet the needs of remote control and program control. I briefly introduced some basic information about the fluorine-lined globe valve. If you still have any questions, you can consult Lianke Valve Co.,Ltd., contact: +86-577-8585 9626. .
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