Brief Analysis Of The Basic Knowledge Of Fluorine-lined Stop Valve

Lined Globe Valve is a forced sealing valve. When the valve is closed, pressure must be applied to the valve disc to prevent leakage from the sealing surface. When the medium enters the valve from under the valve, the resistance overcome by the operating force is the wear force of the valve and gasket and the thrust generated by the medium pressure, 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 top of the valve stem will bend. Since the appearance of the sealing valve, the flow of the valve medium has been changed to enter the valve cavity from above the valve. At this time, affected by the pressure of the dielectric, 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. In addition, this shape of valve is also strict under the action of the medium. When the fluorine-lined stop valve is opened, when the opening height of the valve disc is 25%~30% of the nominal diameter, the flow rate has reached the maximum value, indicating that the valve has reached the fully open position. Therefore, the fully open position of the stop valve should be determined by the stroke of the valve disc.

Fluorine-lined stop valve has the following advantages: 1. Simple structure, easy manufacturing and maintenance. 2. Small working stroke and short opening and closing time. 3. Good sealing, small friction on the sealing surface, and long service life.

No matter what it is, there will definitely be advantages and disadvantages, and the fluorine-lined stop valve is no exception: 1. The fluid resistance is large, and the force required for switching is large. 2. It is not suitable for media with particles and high viscosity. 3. Poor adjustment performance.

Structural features of fluorine-lined stop valves: 1. Compared with gate valves, stop valves have a simple structure and are easy to manufacture and maintain. 2. The sealing surface is not easy to wear and scratch, with good sealing and long service life. 3. Small stroke, short opening and closing time, and small valve height. 4. The valve disc and the valve stem are designed as an integrated structure, with a compact structure and safe use.

There are three structural forms of fluorine-lined stop valves: 1. Straight-through type and direct-current type. Among them, the straight-through type is commonly used. The angle type can be installed in the corner of the pipeline system, and the direct-current flow resistance is the smallest among the stop valves. 2. Configure pneumatic and electrical devices according to user needs to meet the needs of remote control and program control.