Knowledge About Flow Regulation Of Fluorine-lined Stop Valve!
Knowledge about flow regulation of Lined Globe Valve! Fluorine-lined stop valve is a very widely used valve. The reason why it can be liked by the public is closely related to its advantages.
During the opening and closing process, the friction between the sealing surfaces of the fluorine-lined stop valve is small, it is relatively durable, the opening height is not large, it is easy to manufacture and maintain, and it is not only suitable for medium and low pressure, but also for high pressure. Its closing principle is to rely on the valve stem pressure to make the valve disc sealing surface and the valve seat sealing surface fit closely to prevent the flow of the medium.
Fluorine-lined stop valves are generally suitable for conveying liquid and gaseous media under various pressures and various temperatures within the specified standard range, but are not suitable for conveying liquids containing solid precipitation or crystal precipitation. Stop valves can be used in most media flow systems. Various forms of fluorine-lined stop valves have been developed to meet various uses in petrochemical, electric power, metallurgy, urban construction, chemical and other departments. The sealing surface is not easy to wear and scratch, and the sealing performance is good. There is no relative sliding between the valve disc and the valve body sealing surface when the fluorine-lined stop valve is opened and closed, so the wear and scratch are not serious, the sealing performance is good, and the service life is long. The sealing surface area is small, the structure is simple, and the time required to manufacture the sealing surface and the precious materials required for the sealing ring are less than those of the gate valve. When opening and closing, the valve disc has a small stroke, so the height of the fluorine-lined stop valve is smaller than that of the gate valve, but the structural length is longer than that of the gate valve. The opening and closing torque is large, the opening and closing is more laborious, and the opening and closing time is long. The fluid resistance is large, because the medium channel in the valve body is tortuous, the fluid resistance is large, and the power consumption is large. It is not suitable for media with particles, high viscosity, and easy to coke. The adjustment performance is poor.
The flow direction of the medium of the fluorine-lined stop valve is generally downstream when the nominal pressure PN≤16MPa, and the medium flows upward from the bottom of the valve disc; when the nominal pressure PN≥20MPa, the countercurrent is generally used, and the medium flows downward from the top of the valve disc. To increase the sealing performance. When in use, the medium of the fluorine-lined stop valve can only flow in one direction and cannot change the flow direction. It is suitable for use in pipelines of various concentrations of aqua regia, sulfuric acid, hydrochloric acid, hydrofluoric acid and various organic acids, strong acids and strong oxidants at -50℃ to 150℃. FEP is also suitable for use in pipelines of various concentrations of strong alkaline organic solvents and other corrosive gases and liquid media.
